Mike Dixon | University of Waterloo (original) (raw)
Papers by Mike Dixon
Journal of Gambling Studies, Sep 16, 2009
In Ontario, Canada, the regulator approves identical looking slot machine games with different pa... more In Ontario, Canada, the regulator approves identical looking slot machine games with different payback percentages. We gained access to the design documents (called PAR Sheets) used to program these different versions of the same slots game and ran Gambler's Ruin simulations of 2,000 first-time players who each arrived with a 100bankrollandplayedeitherthe85or98100 bankroll and played either the 85 or 98% version of the same game until broke. Simulations revealed that the typical (median) player's experience did not differ significantly between versions. However the payback percentage affected the experience of players in the upper tails of the distributions with those in the 98% version having dramatically more total spins, winning spins, entries into the "bonus mode", and "hand pays" (a win of 100bankrollandplayedeitherthe85or98125 or more on a given spin). Most importantly, the number of simulated players who had a maximum peak balance in excess of $1,000 rose tenfold-from 5 in the 85% version to 54 in the 98% version. The results are discussed in terms of the Pathways Model of Problem and Pathological Gambling especially in terms of behavioural conditioning, cognitive beliefs, and early big wins. It may well be that those machines that are on the surface the "fairest" to the gambler, actually pose the most risk for ensuing gambling problems.
Journal of Gambling Studies, Oct 1, 2013
The MIT Press eBooks, 2015
Journal of Gambling Studies, Dec 1, 2013
Journal of Vision, Aug 12, 2010
Journal of Gambling Studies, Jun 6, 2017
Journal of Gambling Studies, Mar 2, 2014
Reinforcement is a key component of slot machine play. Multi-line video slot-machine play can lea... more Reinforcement is a key component of slot machine play. Multi-line video slot-machine play can lead to "losses disguised as wins" (LDWs) which are credit gains that total less than the wager on the spin. LDWs only occur on multi-line games, with their frequency increasing with the number of lines played. If perceived as wins, they will be reinforcing to the player despite actually being losses. It has been suggested that players may attempt to maximize their reinforcement rates by playing maximum lines with a minimum bet per line. We recorded the actual game play of 83 participants on two different machines having different LDW rates. On both machines, players, regardless of problem gambling status, seldom bet on a single line (<6 % of spins), preferring to bet on the maximum number of lines available (>70 % of spins). Post-reinforcement pauses indicated that players found LDWs significantly more rewarding than losses and as rewarding as small wins. Players significantly overestimated the number of times they won more than their spin wager (i.e., miscategorizing LDWs as wins). Players indicated a number of game traits that made them prefer one machine over the other. Players who preferred the game with many LDWs endorsed "lack of long losing streaks" and "frequency of wins" to a greater degree than those preferring the other game. In sum, gamblers prefer playing maximum lines. Maximum line-play increases the frequency of LDWs. Players may miscategorize LDWs as wins, thus increasing the perceived reinforcement rate of multi-line slot machine.
Journal of Gambling Studies, 2021
Slot machines are a very popular form of gambling in which a small proportion of gamblers experie... more Slot machines are a very popular form of gambling in which a small proportion of gamblers experience gambling-related problems. These players refer to a trance-like state that researchers have labelled ‘dark flow’—a pleasurable, but maladaptive state where players become completely occupied by the game. We assessed 110 gamblers for mindfulness (using the Mindful Attention Awareness Scale), gambling problems (using the Problem Gambling Severity Index), depressive symptoms (using the Depression, Anxiety, and Stress Scale), and boredom proneness (using the Boredom Proneness Scale). Participants played both a multiline and single-line slot machine simulator and were occasionally interrupted with thought probes to assess whether they were thinking about the game or something else. After playing each game, we retrospectively assessed dark flow and affect during play. Our key results were that the number of “on-game” reports during the multiline game were significantly higher than the sing...
Journal of Gambling Issues, 2021
Playing video games to escape daily life is associated with problem video gaming and depression. ... more Playing video games to escape daily life is associated with problem video gaming and depression. Playing to escape is an especially common motive among players of role-playing games (RPGs). Given that RPGs are highly immersive, a possible source of positive affect for depressed escape players may be the rewarding aspects of flow or immersion. We aimed to ascertain whether players who report gaming to escape are more prone to experiencing flow while playing RPGs but not arcade-type platform games. In Experiment 1, we measured the depression symptoms and player motives of 56 participants while they played an RPG. We measured subjective arousal, flow, and positive affect after each condition of an ABBA design (A was a control condition featuring a simplified game, B the fully immersive game). In Experiment 2, we recruited 65 players to play a simple platform game (also measuring problem video gaming and mindfulness). In both studies, we contrasted those in the upper tercile of escape m...
International Gambling Studies, 2020
The Alberta Gambling Research Institute and the University of Lethbridge co-sponsored the fourtee... more The Alberta Gambling Research Institute and the University of Lethbridge co-sponsored the fourteenth in a series of special interest conferences in the area of gambling studies. The conference theme was "Critical Issues in Gambling Research." The conference took place Friday, March 27, & Saturday, March 28, 2015 at the Banff Centre.
Journal of Gambling Studies, 2020
Losses disguised as wins (LDWs) are slot machine outcomes where players gain fewer credits than t... more Losses disguised as wins (LDWs) are slot machine outcomes where players gain fewer credits than they wager. Despite being losses, slot machines celebrate LDWs with positive sounds and animations, leading gamblers to respond to them as wins. It is unknown how manipulating the sound following LDWs may influence gamblers’ behaviour. In Experiment 1, participants played two conditions on a realistic slot machine simulator: a (standard) positive sound condition (LDWs paired with positive sound, losses paired with silence), and a negative sound condition (LDWs and losses paired with negative sound). We measured participants’ behavioural responses [post-reinforcement pauses (PRPs)], win estimates, and subjective experience. In the negative sound condition, participants behaviourally responded to LDWs in a more loss-like and less win-like fashion, as measured by PRPs. Win estimates were reduced, and subjective experience was significantly impacted, but only when the negative sound condition...
Journal of Gambling Studies, 2019
International Gambling Studies, 2014
ABSTRACT Problem gamblers often have distorted beliefs about gambling, including illusion of cont... more ABSTRACT Problem gamblers often have distorted beliefs about gambling, including illusion of control and gambler's fallacy. Most multiline slots games allow players to adjust the number of wagered paylines and the amount bet per line, and over time this control may support incorrect conclusions and promote distorted gambling beliefs. We created software to run simulations of a popular multiline slots game and examined the effects of betting on single versus multiple paylines. Simultaneous multiline betting tends to produce a less varied gambling experience because it increases the frequency of legitimate wins and ‘losses disguised as wins’, while decreasing the occurrence of ‘big wins’. It also shortens consecutive series of losing spins and it prolongs the time a typical player takes to exhaust funds. Indirect control over losing streaks may give some players the false impression that they can play skilfully and predict the occurrence of wins. However, applying five different wagering strategies in our simulations showed that none had any real effect on the average percentage of wagers that would be ‘paid back’ to players as prizes. Player control over multiline slots games may lead frequent gamblers to incorrect conclusions that sustain excessive play despite recurring losses.
Journal of Gambling Studies, 2013
Journal of Gambling Studies, 2013
Journal of Gambling Studies, Sep 16, 2009
In Ontario, Canada, the regulator approves identical looking slot machine games with different pa... more In Ontario, Canada, the regulator approves identical looking slot machine games with different payback percentages. We gained access to the design documents (called PAR Sheets) used to program these different versions of the same slots game and ran Gambler's Ruin simulations of 2,000 first-time players who each arrived with a 100bankrollandplayedeitherthe85or98100 bankroll and played either the 85 or 98% version of the same game until broke. Simulations revealed that the typical (median) player's experience did not differ significantly between versions. However the payback percentage affected the experience of players in the upper tails of the distributions with those in the 98% version having dramatically more total spins, winning spins, entries into the "bonus mode", and "hand pays" (a win of 100bankrollandplayedeitherthe85or98125 or more on a given spin). Most importantly, the number of simulated players who had a maximum peak balance in excess of $1,000 rose tenfold-from 5 in the 85% version to 54 in the 98% version. The results are discussed in terms of the Pathways Model of Problem and Pathological Gambling especially in terms of behavioural conditioning, cognitive beliefs, and early big wins. It may well be that those machines that are on the surface the "fairest" to the gambler, actually pose the most risk for ensuing gambling problems.
Journal of Gambling Studies, Oct 1, 2013
The MIT Press eBooks, 2015
Journal of Gambling Studies, Dec 1, 2013
Journal of Vision, Aug 12, 2010
Journal of Gambling Studies, Jun 6, 2017
Journal of Gambling Studies, Mar 2, 2014
Reinforcement is a key component of slot machine play. Multi-line video slot-machine play can lea... more Reinforcement is a key component of slot machine play. Multi-line video slot-machine play can lead to "losses disguised as wins" (LDWs) which are credit gains that total less than the wager on the spin. LDWs only occur on multi-line games, with their frequency increasing with the number of lines played. If perceived as wins, they will be reinforcing to the player despite actually being losses. It has been suggested that players may attempt to maximize their reinforcement rates by playing maximum lines with a minimum bet per line. We recorded the actual game play of 83 participants on two different machines having different LDW rates. On both machines, players, regardless of problem gambling status, seldom bet on a single line (<6 % of spins), preferring to bet on the maximum number of lines available (>70 % of spins). Post-reinforcement pauses indicated that players found LDWs significantly more rewarding than losses and as rewarding as small wins. Players significantly overestimated the number of times they won more than their spin wager (i.e., miscategorizing LDWs as wins). Players indicated a number of game traits that made them prefer one machine over the other. Players who preferred the game with many LDWs endorsed "lack of long losing streaks" and "frequency of wins" to a greater degree than those preferring the other game. In sum, gamblers prefer playing maximum lines. Maximum line-play increases the frequency of LDWs. Players may miscategorize LDWs as wins, thus increasing the perceived reinforcement rate of multi-line slot machine.
Journal of Gambling Studies, 2021
Slot machines are a very popular form of gambling in which a small proportion of gamblers experie... more Slot machines are a very popular form of gambling in which a small proportion of gamblers experience gambling-related problems. These players refer to a trance-like state that researchers have labelled ‘dark flow’—a pleasurable, but maladaptive state where players become completely occupied by the game. We assessed 110 gamblers for mindfulness (using the Mindful Attention Awareness Scale), gambling problems (using the Problem Gambling Severity Index), depressive symptoms (using the Depression, Anxiety, and Stress Scale), and boredom proneness (using the Boredom Proneness Scale). Participants played both a multiline and single-line slot machine simulator and were occasionally interrupted with thought probes to assess whether they were thinking about the game or something else. After playing each game, we retrospectively assessed dark flow and affect during play. Our key results were that the number of “on-game” reports during the multiline game were significantly higher than the sing...
Journal of Gambling Issues, 2021
Playing video games to escape daily life is associated with problem video gaming and depression. ... more Playing video games to escape daily life is associated with problem video gaming and depression. Playing to escape is an especially common motive among players of role-playing games (RPGs). Given that RPGs are highly immersive, a possible source of positive affect for depressed escape players may be the rewarding aspects of flow or immersion. We aimed to ascertain whether players who report gaming to escape are more prone to experiencing flow while playing RPGs but not arcade-type platform games. In Experiment 1, we measured the depression symptoms and player motives of 56 participants while they played an RPG. We measured subjective arousal, flow, and positive affect after each condition of an ABBA design (A was a control condition featuring a simplified game, B the fully immersive game). In Experiment 2, we recruited 65 players to play a simple platform game (also measuring problem video gaming and mindfulness). In both studies, we contrasted those in the upper tercile of escape m...
International Gambling Studies, 2020
The Alberta Gambling Research Institute and the University of Lethbridge co-sponsored the fourtee... more The Alberta Gambling Research Institute and the University of Lethbridge co-sponsored the fourteenth in a series of special interest conferences in the area of gambling studies. The conference theme was "Critical Issues in Gambling Research." The conference took place Friday, March 27, & Saturday, March 28, 2015 at the Banff Centre.
Journal of Gambling Studies, 2020
Losses disguised as wins (LDWs) are slot machine outcomes where players gain fewer credits than t... more Losses disguised as wins (LDWs) are slot machine outcomes where players gain fewer credits than they wager. Despite being losses, slot machines celebrate LDWs with positive sounds and animations, leading gamblers to respond to them as wins. It is unknown how manipulating the sound following LDWs may influence gamblers’ behaviour. In Experiment 1, participants played two conditions on a realistic slot machine simulator: a (standard) positive sound condition (LDWs paired with positive sound, losses paired with silence), and a negative sound condition (LDWs and losses paired with negative sound). We measured participants’ behavioural responses [post-reinforcement pauses (PRPs)], win estimates, and subjective experience. In the negative sound condition, participants behaviourally responded to LDWs in a more loss-like and less win-like fashion, as measured by PRPs. Win estimates were reduced, and subjective experience was significantly impacted, but only when the negative sound condition...
Journal of Gambling Studies, 2019
International Gambling Studies, 2014
ABSTRACT Problem gamblers often have distorted beliefs about gambling, including illusion of cont... more ABSTRACT Problem gamblers often have distorted beliefs about gambling, including illusion of control and gambler's fallacy. Most multiline slots games allow players to adjust the number of wagered paylines and the amount bet per line, and over time this control may support incorrect conclusions and promote distorted gambling beliefs. We created software to run simulations of a popular multiline slots game and examined the effects of betting on single versus multiple paylines. Simultaneous multiline betting tends to produce a less varied gambling experience because it increases the frequency of legitimate wins and ‘losses disguised as wins’, while decreasing the occurrence of ‘big wins’. It also shortens consecutive series of losing spins and it prolongs the time a typical player takes to exhaust funds. Indirect control over losing streaks may give some players the false impression that they can play skilfully and predict the occurrence of wins. However, applying five different wagering strategies in our simulations showed that none had any real effect on the average percentage of wagers that would be ‘paid back’ to players as prizes. Player control over multiline slots games may lead frequent gamblers to incorrect conclusions that sustain excessive play despite recurring losses.
Journal of Gambling Studies, 2013
Journal of Gambling Studies, 2013