![]() Bonus features were associated with rapid increases in pupil diameter following the onset of outcome-related audiovisual feedback, relative to losses. ![]() ![]() Analyses differentiated loss outcomes, wins, losses-disguised-as-wins, and (free-spin) bonus features. In Experiment 1A, experienced slot machine gamblers (N = 53) played a commercially-available slot machine in a laboratory for 20 minutes while wearing mobile eye tracking glasses. We further examined the contribution of game luminance fluctuations on pupil diameter. We hypothesized that positively reinforcing slot machine outcomes would be associated with increases in arousal, reflected in larger pupil diameter. Here we investigated pupil dilation derived from eye tracking as a means of capturing changes in sympathetic nervous system arousal following outcomes on a real slot machine. Psychophysiological measures may provide a window into mental processes that underpin these harms. Modern slot machines are among the more harmful forms of gambling.
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