| Sumario: | Traditionally, near-miss events in games of skill provide feedback to an individual regarding his or her performance. However, in games of chance, like slot machine gambling, the use fails to carry over. A near miss in slot machine gambling may still be endorsed when most of the symbols falling on a payline match, though technically this arrangement provides no real measure of skill or progress. To date, attempts to study the near miss in slot machine gambling have used resistance to extinction and preference assessment preparations, both of which unsuccessfully capture any putative reinforcement properties. The current investigation introduces a new methodology to assess putative conditioned reinforcement properties of stimuli correlated with the near miss in simulated slot machine gambling by incorporating the observing response with concurrently available schedules, termed simultaneous observing. Successful tests of the methodology regarding schedule-correlated stimuli in relation to win rates demonstrate its potential use, and failure to identify a near-miss event as producing reinforcing effects for schedule-correlated stimuli adds credibility to its ability to discriminate between functions.
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