An interventional study of Prevention pop-up messages and Mandatory time limit in Gambling, sponsored by Benjamin Galipeau. Recruiting at 1 site in Canada. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-04-01.
Sponsored by Benjamin Galipeau · Not applicable, Interventional, and Prevention
The goals of this randomized controlled trial are to test the manifold effects of prevention pop-up messages on participants' behaviours, cognitions and affects. This study is conducted among regular EGMs' players (defined as having played EGMs at least once every two weeks for the past 12 months) who are not classified as probable pathological gamblers by the PGSI.
After answering a series of short questionnaires by phone, participants are asked to schedule a gambling session which is done in a laboratory on the university's campus. This laboratory replicates a typical bar, and is equipped with real EGMs. Participants are recruited under the false pretense of giving their opinion on the realism of the bar replica, and on the overall feeling of the gambling session in it. They are told that: (a) they are free to gamble as much and for as long as they like; (b) they are allowed to take breaks; (c) gambling is to be done with their own money; (d) the only compensation for participation are the potential winnings made while gambling; (e) net winnings across their whole session are paid, but losses are real. There is only one participant at a time in the laboratory for the gambling session.
After having stopped by their own volition (some exceptions apply, see "Detailed Description" for further details), participants are debriefed on the real goals of this study and reimbursed any incurred losses while gambling. They are then be asked to answer another series of questionnaires.
EGMs and online gambling are the reputedly most damaging gambling type from a public health perspective. Pop-up messages are often used as a responsible gambling (RG) measure to prevent harm for these screen-based types of gambling. Despite some evidence of effectiveness in the literature for these messages, limitations persists, among which low ecological validity is of particular concern.
Indeed, gambling studies set in a controlled environment, usually a laboratory setting, often require participants to engage in a gambling task while wagering some form of virtual credits or money provided upfront by the researchers as a compensation for participation. Their behaviour is then assumed alike what would happen in a real gambling setting, even though gamblers are not risking their own money. Surprisingly, this assumption has not been subject to much scientific scrutiny. Moreover, some studies provide data which seems to contradict this assumption.
This study address this limitation by heightening the realism factor. This study starts with an intake interview by phone to evaluate eligibility, PGSI category, sociodemographic characteristics, gambling behaviours on EGMs (past 12 months), general level of fun while playing EGMs (past 12 months) and perceived self-control while playing EGMs. Participants are then asked to schedule a gambling session which is done in a laboratory on the university's campus. This laboratory replicates a typical bar, and is equipped with real EGMs. Participants are recruited under the false pretense of giving their opinion on the realism of the bar replica, and on the overall feeling of the gambling session in it. They are told that:
There is only one participant at a time in the laboratory for the gambling session. While in the bar replica, the participant is joined by a research assistant who plays the role of barmaid/barman. The assistant is there for general realism purposes, operating the cash register (Square terminal), and ensuring the general safety of the session. The bar replica has three EGMs, but only one can be played on and used to show the prevention pop-up messages. The other two EGMs are turned on for ambiance purposes, but have their money collector disabled to prevent participants playing on them or switching between EGMs mid-session. Limiting play to only one EGM also eases the recording of gambling behaviours and proper showing of the prevention messages. Participants are told the two "unusable" EGMs are awaiting to be serviced because of their money collector malfunction.
A second research assistant is located in an adjacent room. They are responsible for (a) recording all gambling behaviours using a computer connected to the EGM; and (b) operating the pop-up messages presentation schedule. A spy camera (disguised as a smoke detector) with a live-feed is used to observe gambling related behaviours that can't be recorded by the EGM's computer (e.g. taking a break).
The gambling session ends when the participant cashes out and unambiguously tell the research assistant they want to end their session. The participant is then brought to an office for a series of questionnaires which are, in order:
Note that while the participant is told they can gamble for as long as they like, in reality there is a 2 hours time limit to the gambling session duration. This time limit is hidden from the participant. The gambling session starts with the first time money is inserted in the EGM by the participant (the "clock" is set at 0 hours) and ends with either the participant ending it of their own volition or upon reaching the time limit (2 hours). Breaks during gambling session are permitted (e.g. for going to the bathroom, for buying snacks from the barman/barmaid, etc.) and don't stop the "clock".
If the participant has not yet ended their gambling session on their own volition upon reaching the 2 hours time limit, they will be asked to take a small break to answer some questions. The existence of a time limit will be communicated to them during the debriefing. In the eventuality of a participant refusing to stop playing or wanting to rapidly quit the laboratory (e.g. because they are angry about losing money), the debriefing will be done earlier, before the questionnaire about their perception of realism of the bar replica and the gambling session in it. While not optimal, early debriefing is nevertheless considered acceptable in order to force the end of the gambling session or to prevent a participant from hastily quitting the study without receiving all the information to make an informed decision about their participation. There will be no more gambling done after debriefing.
Upon debriefing the participant will be reimbursed all money lost (if any).
The mains objectives are to test to what extent do RG pop-up messages affect:
Secondary objectives are to test:
the feasibility of studies conducted in a laboratory setting with the use of real money (or using deception to make the participants believe they are gambling their own money). This objective is answered with four sub-questions:
158 studies on the registry are indexed under Gambling; 42 are open to participants now.
This study's planned enrollment of 80 is above the median of 66 across 128 interventional studies indexed under Gambling.
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Exclusion Criteria:
Same as active comparator with the addition of prevention pop-up messages delivered during the gambling session on a fixed presentation schedule. Due to hardware limitations on the EGMs' part, the prevention messages presented only alter what is shown on the play screen (they fill it completely, hiding the game), but can't pause the game per se. The EGMs' buttons, sound, and music are still operational while the message is shown. While disrupting play flow, this still lets the participant place bets (albeit without seeing what is going on).
Behavioral: Prevention pop-up messages · Behavioral: Mandatory time limit · Behavioral: Responsible gambling information · Device: Electronic gambling machine (model IGT GL20) · Device: Square terminal
Gambling session on EGMs in a room replicating a bar (subdued light, music, bar paraphernalia, fake liquor on display, research assistant acting as barman and selling non-alcoholic soft drinks and chips). Participants are invited to participate under the false pretense of giving their opinion on the realism of the bar replica and overall feeling of the gambling session in it. They are told that: (a) they are free to gamble as much and for as long as they like; (b) they are allowed to take breaks; (c) gambling is to be done with their own money; (d) the only compensation for participation are winnings that could be made while gambling; (e) net winnings across their whole session are paid up to $500, but losses are real. Lost money is given back after debriefing (see Study Detailed Description).
Behavioral: Mandatory time limit · Behavioral: Responsible gambling information · Device: Electronic gambling machine (model IGT GL20) · Device: Square terminal
Messages are shown full screen on the EGM's play screen on a fixed presentation schedule. Clock of the gambling session starts the first time the participant puts money in the EGM. From this event, messages are shown at those timepoints: \[1\] +10 minutes; \[2\] +40 minutes; \[3\] +70 minutes; \[4\] +100 minutes. Messages block the screen for 15 seconds before automatically closing. Up to 4 different messages are presented during the gambling session. Order is determined by sortition without replacement. Messages have a warning heading "Caution!". Content is, from top to bottom: (a) time spent gambling from beginning; (b) warning that gambling could lead to serious monetary loss; (c) 1 of 4 self-appraisal phrases about current gambling behaviour; (d) advice to the participant that a break could help choose what is best for them; (e) countdown before the message closes itself; (f) Health department logo is shown in the lower right corner as a more "neutral" endorsement of the messages.
Activated either when (a) the previous time limit is up; or (b) the player bank meter reaches $0. When the previous time limit is up, a pop-up takes up the upper third of the play screen and requires the player to set a new time limit using one of five choice buttons (four firsts buttons: 15, 30, 45 or 60 minutes; fifth button: cash out, which prints a receipt and ends the gambling session). As the EGM cannot track who is playing, there are no limits on consecutive gambling sessions. When the player's bank meter reaches $0, the the pop-up described above appears as soon as new money is inserted in the EGM, no matter if the previous time limit is up or not.
Located in a submenu accessed through a button on the main touch screen. This open a window which contains basic information on randomness and responsible gambling advice. The information is presented in small white font on a black background.
EGM model currently in use in Quebec, Canada, the location where this study is conducted. The EGMs used in this study are fully functional and unaltered except for the presentation of prevention pop-up messages in the experimental arm of this study. These machines are equipped with basics responsible gambling features, the two main ones described in this section (i.e. "Mandatory time limit"; "Responsible gambling information"). Wins/losses sequence is fully randomized and not determined beforehand.
Also known as: EGM
This terminal allows for buying non-alcoholic beverages (soft drinks or coffee) and chips during the experimentation. This is done to enhance the realism of the bar setting. It also allows for real cash withdrawal from bank account during gambling session. Quebec's code of conduct for EGMs commercialization prohibits retailers from having an ATM near their EGMs, and prohibits them from lending money to consumers or withdrawing cash for them to gamble. However, this rule is not always followed in practice. For this study, participants will be allowed to withdraw from their bank account, at the bar counter, if they ask for it. However, this will not be offered to them upfront.
Gambling behaviour (between group) - Gambling session's total duration
Time elapsed between the first time the participant puts money in the EGM (0h00) to the end of the gambling session. Session's duration is left for the participant to decide. While the participant is told they can play for as long as they like, there is a 2 hrs limit on the session duration. This limit is hidden from the participant. Session's duration includes any breaks taken from gambling on the EGM.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Gambling behaviour (between group) - Total time effectively spent gambling
Same as Outcome 1 (Gambling session's total duration), but minus breaks taken from gambling on the EGM.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Gambling behaviour (between group) - Number of breaks taken
Number of breaks taken from gambling on the EGM during the gambling session.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Gambling behaviour (between group) - Mean breaks' duration
Average duration of breaks' taken from gambling on the EGM over the gambling session's total duration.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Gambling behaviour (between group) - Total breaks duration
Sum of breaks' duration taken from gambling on the EGM over the gambling session's total duration.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Gambling behaviour (between group) - Mean time elapsed between breaks
Average time separating any two breaks taken from gambling on the EGM over the gambling session's total duration.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Gambling behaviour (between group) - Money betted (physical)
Money physically inserted in the EGM during the gambling session. This is evaluated as a cumulative amount at each timepoint a prevention message is presented in the experimental group and at the timepoint where the participant decides to end their gambling session (max 2h00). Money betted is also evaluated between said timepoints (e.g. between 1h10 and 0h40, between 0h40 and 1h10, etc.).
Time frame: Assessed at following timepoints from start of gambling session in the laboratory (Experiment phase; 0 hours 0 minutes): [1] +10 minutes; [2] +40 minutes; [3] +70 minutes; [4] +100 minutes; [5] end of gambling session (+2 hours maximum).
Gambling behaviour (between group) - Money betted (all)
Money betted on the EGM during the gambling session. This is money used to "buy rounds on the EGM", whether it's money physically inserted in the EGM or money won while gambling and betted again. This is evaluated as a cumulative amount at each timepoint a prevention message is presented in the experimental group and at the timepoint where the participant decides to end their gambling session (max 2h00). Money betted is also evaluated between said timepoints (e.g. between 1h10 and 0h40, between 0h40 and 1h10, etc.).
Time frame: Assessed at following timepoints from start of gambling session in the laboratory (Experiment phase; 0 hours 0 minutes): [1] +10 minutes; [2] +40 minutes; [3] +70 minutes; [4] +100 minutes; [5] end of gambling session (+2 hours maximum).
Gambling behaviour (between group) - Number of bets placed
Number of bets placed on the EGM during the gambling session. This is evaluated as a cumulative number at each timepoint a prevention message is presented in the experimental group and at the timepoint where the participant decides to end their gambling session (max 2h00). Number of bets placed are also evaluated between said (e.g. between 1h10 and 0h40, between 0h40 and 1h10, etc.).
Time frame: Assessed at following timepoints from start of gambling session in the laboratory (Experiment phase; 0 hours 0 minutes): [1] +10 minutes; [2] +40 minutes; [3] +70 minutes; [4] +100 minutes; [5] end of gambling session (+2 hours maximum).
Gambling behaviour (between group) - Gambling speed
Number of bets placed on the EGM during the gambling session over a given amount of time (i.e. bets/min). This is evaluated at each timepoint a prevention message is presented in the experimental group and at the timepoint where the participant decides to end their gambling session (max 2h00). Gambling speed is also evaluated between said timepoints (e.g. between 1h10 and 0h40, between 0h40 and 1h10, etc.).
Time frame: Assessed at following timepoints from start of gambling session in the laboratory (Experiment phase; 0 hours 0 minutes): [1] +10 minutes; [2] +40 minutes; [3] +70 minutes; [4] +100 minutes; [5] end of gambling session (+2 hours maximum).
Gambling behaviour (between group) - Gambling intensity (physical)
Money physically inserted in the EGM during the gambling session over a given amount of time (i.e. $/min). This is evaluated at each timepoint a prevention message is presented in the experimental group and at the timepoint where the participant decides to end their gambling session (max 2h00). Gambling intensity is also evaluated between said (e.g. between 1h10 and 0h40, between 0h40 and 1h10, etc.).
Time frame: Assessed at following timepoints from start of gambling session in the laboratory (Experiment phase; 0 hours 0 minutes): [1] +10 minutes; [2] +40 minutes; [3] +70 minutes; [4] +100 minutes; [5] end of gambling session (+2 hours maximum).
Gambling behaviour (between group) - Gambling intensity (all)
Money betted on the EGM during the gambling session over a given amount of time (i.e. $/min). This is money used to "buy rounds on the EGM", whether it's money physically inserted in the EGM or money won while gambling and betted again. This is evaluated at each timepoint a prevention message is presented in the experimental group and at the timepoint where the participant decides to end their gambling session (max 2h00). Gambling intensity is also evaluated between said timepoints (e.g. between 1h10 and 0h40, between 0h40 and 1h10, etc.).
Time frame: Assessed at following timepoints from start of gambling session in the laboratory (Experiment phase; 0 hours 0 minutes): [1] +10 minutes; [2] +40 minutes; [3] +70 minutes; [4] +100 minutes; [5] end of gambling session (+2 hours maximum).
Perceived self-control while gambling on EGMs (between group)
Participant's perceived ability to control their gambling behaviour (e.g. sticking to their predetermined limits) over the gambling session's total duration. Evaluated with a 7-points Likert scale (1 = "I never had control" to 7 = "I always had control").
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
General level of fun while gambling on EGMs (between group)
Participant's general enjoyment of gambling on EGMS over the gambling session's total duration. Evaluated with a 7-points Likert scale (1 = "I hated it" to 7 = "I loved it").
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Psychological reactance to prevention pop-up messages (between group)
Evaluated based on the Dillard \& Shen (2005) method: (a) Induction check (4 items, 7-points Likert scale, 1 = "Strongly disagree, 7 - "Strongly agree"); (b) Anger (4 items, 7-points Likert scale, 1 = "Strongly disagree, 7 - "Strongly agree"); (c) Cognitive response (count of negative thoughts in relation to the pop-up messages); (d) Attitude (7 word pairs, 7-points semantic differential scale).
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived behavioural effectiveness of prevention pop-up messages (between group)
Participant's perceived effectiveness of prevention pop-up messages on modifying their gambling behaviour during the gambling session. Evaluated with two 7-points Likert scale about the perceived effects of the prevention po-up messages on money betted and time spent during the gambling session (1 = "lowered gambling behaviour a lot" to 7 = "heightened gambling behaviour a lot").
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Change in gambling behaviours (within group) - Money betted (physical)
Money physically inserted in the EGM. Change is evaluated by comparing self-reported betting habits on EGMs for the past 12 months (measured during the pre-experiment phase) and objectively measured money physically inserted in the EGM during the over the laboratory gambling session's total duration (Outcome 8; measured during the experiment phase).
Time frame: Change from Pre-experiment phase (i.e. "intake"; single measurement point; cover past 12 months) at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Change in gambling behaviours (within group) - Total time effectively spent gambling
Time elapsed between the first time the participant puts money in the EGM to the end of the gambling session. Change is evaluated by comparing self-reported typical time spent gambling on EGMs for a single session for the past 12 months (measured during the pre-experiment phase) and objectively measured laboratory gambling session's total duration (Outcome 1; measured during the experiment phase). Note that, unbeknown to the participant, the laboratory gambling session is limited to 2 hrs max.
Time frame: Change from Pre-experiment phase (i.e. "intake"; single measurement point; cover past 12 months) at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Change in perceived self-control while gambling on EGMs (within group)
Participant's perceived ability to control their gambling behaviour on EGMs (e.g. sticking to their predetermined limits). Evaluated with a 7-points Likert scale (1 = "I never had control" to 7 = "I always had control"). Change is evaluated by comparing self-reported typical perceived self-control while gambling on EGMs for the past 12 months (measured during the pre-experiment phase) and self-reported perceived self-control while gambling on EGMs over the laboratory gambling session's total duration (Outcome 14; measured in the post-experiment phase).
Time frame: Change from Pre-experiment phase (i.e. "intake"; single measurement point; cover past 12 months) at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Change in general level of fun while gambling on EGMs (within group)
Participant's general enjoyment of gambling on EGMs. Evaluated with a 7-points Likert scale (1 = "I hated it" to 7 = "I loved it"). Change is evaluated by comparing self-reported typical level of fun while gambling on EGMs for the past 12 months (measured during the pre-experiment phase) and self-reported level of fun while gambling on EGMs over the laboratory gambling session's total duration (Outcome 15; measured in the post-experiment phase).
Time frame: Change from Pre-experiment phase (i.e. "intake"; single measurement point; cover past 12 months) at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived realism - Gambling location type most resembling the session in the laboratory
Among a predetermined list of gambling location type (e.g. bar/restaurant, casino, etc.), participant choose which the gambling session in the laboratory resembled the most.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived realism - Session in the laboratory VS gambling on EGMs in a bar/restaurant
Level on resemblance between a gambling session on EGMs in a bar/restaurant and the gambling session in the laboratory. Evaluated with a 7-points Likert scale (1 = "Almost 100 % different" to 7 = "Almost 100 % the same").
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived realism - Similarities between session in the laboratory VS gambling on EGMs in a bar/restaurant
Things that were the same or very alike when comparing a gambling session on EGMs in a bar/restaurant and the gambling session in the laboratory. Participant lists all resemblances that come to their mind.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived realism - Differences between session in the laboratory VS gambling on EGMs in a bar/restaurant
Things that were not the same or very not alike when comparing a gambling session on EGMs in a bar/restaurant and the gambling session in the laboratory. Participant lists all differences that come to their mind.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived realism - What could be done to heighten realism of the session in the laboratory
Things or aspects of the study that be changed in order for the gambling session in the laboratory to be more alike a real gambling session on EGMs in a bar/restaurant. Participant lists all that come to their mind.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived realism - Effect of using one own money on realism
Effect of gambling one own money in this study on the level of realism. Evaluated with a 7-points Likert scale (1 = "It lessened the realism a lot" to 7 = " It heighten the realism a lot ").
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived realism - Effect of using one own money on realism (free)
Effect of gambling one own money in this study on the level of realism. Participant freely explain their perception of said effect.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived correspondence between habitual gambling behaviour and gambling behaviour during the session in the laboratory
Participant's perception of how much their gambling behaviour during their gambling session in the laboratory was representative (i.e. how much it was the same) of their gambling behaviour on EGMs in the past 12 months. Evaluated with a 7-points Likert scale (1 = "Almost 100 % different" to 7 = "Almost 100 % the same").
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Perceived correspondence between habitual gambling behaviour and gambling behaviour during the session in the laboratory (free)
Participant's perception of how much their gambling behaviour during their gambling session in the laboratory was representative (i.e. how much it was the same) of their gambling behaviour on EGMs in the past 12 months. Participant freely explain their perception.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Protocol credibility
Participant's level of certitude they were betting their own money and that they could loose money for real during the study. Evaluated with a 7-points Likert scale (1 = "Almost 100 % certain they were going to get their money back at the end of the study" to 7 = "Almost 100 % certain winnings and losses were real").
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Protocol credibility (free)
Participant comment freely on their level of certitude that they were betting their own money and that they could loose money for real during the study.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Recruitment potential - Volunteers
Number of people that answered the recruitment ad and wanted to either participate or get more information on the study.
Time frame: Assessed after recruitment for the study is ended (80 participants recruited) or 1 year after recruitment for the study has begun, whichever came first.
Recruitment potential - Recruited
Number of people that qualified and agreed to participate in the study.
Time frame: Assessed after recruitment for the study is ended (80 participants recruited) or 1 year after recruitment for the study has begun, whichever came first.
Recruitment potential - Rejected
Number of people that volunteered to participate but didn't qualify according to the inclusion/exclusion criteria.
Time frame: Assessed after recruitment for the study is ended (80 participants recruited) or 1 year after recruitment for the study has begun, whichever came first.
Recruitment potential - Refusal
Number of people that qualified for participation in the study but refused to do so after hearing the details of it.
Time frame: Assessed after recruitment for the study is ended (80 participants recruited) or 1 year after recruitment for the study has begun, whichever came first.
Attrition
Number of people that qualified and agreed to participate in the study but desisted during their participation.
Time frame: Assessed after recruitment for the study is ended (80 participants recruited) or 1 year after recruitment for the study has begun, whichever came first.
Prevention pop-up messages recall - Free recall (Y/N)
Participant is asked if they saw any prevention pop-up messages during their gambling session in the laboratory. This is a Yes/No question.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Prevention pop-up messages recall - Free recall (number)
If participant declared they saw prevention pop-up messages during their gambling session in the laboratory, they are asked how many there were. The same message presented twice count as "2".
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Prevention pop-up messages recall - Free recall (content)
If participant declared they saw prevention pop-up messages during their gambling session in the laboratory, they are asked to freely describe them (i.e. content, graphical appearance, etc.).
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Prevention pop-up messages recall - Cued recall (Y/N)
Participant is presented with a list of prevention pop-up messages that could have been shown during the study. For each of them, they are asked to identify if they saw it or no.
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Prevention pop-up messages recall - Cued recall (number)
If participant declared they saw prevention pop-up messages during their gambling session in the laboratory, they are asked how many there were. The same message presented twice count as "2". This is different from Outcome 39 because, participant might recognize a message they had forgotten about or a message they saw but didn't considered it a "prevention message".
Time frame: Assessed at the end gambling session in the laboratory (Post-experiment phase). Session's length is decided by participant (but limited to 2 hours maximum).
Plan to share: No — The ethics committee doesn't allow for unrestricted sharing of IPD. However, we will try our best to answer any questions related to IPD within the boundaries set by the ethics committee.
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