Assessing potential reinforcement-like effects of brief stimuli unrelated to food reinforcers

It is widely assumed that reinforcers are biologically relevant stimuli, or stimuli that have been associated with biologically relevant stimuli. However, brief, arbitrary stimuli have also been reported to have reinforcement-like effects, despite being unrelated to biologically relevant stimuli like food. The present study explored the potential reinforcement-like effects of brief stimuli across 5 experiments. In Experiments 1 through 4, pigeon subjects responded for food reinforcement and brief stimulus presentations in a 2-component multiple schedule. Neither baseline response rates nor resistance to change during disruption tests were systematically greater in a component with versus without brief stimulus presentations. Increasing the rate and duration of brief stimulus presentations in Experiment 4 did not reveal reinforcement-like effects when compared directly with food. In Experiment 5, pigeons chose between independent terminal links in a concurrent-chains procedure. Across conditions, varying the location, duration, and rate of brief stimulus presentations in the terminal links had no systematic effects on preference. In contrast, varying rates of food reinforcers resulted in large and reliable shifts in preference. Therefore, the present study found no systematic evidence that brief stimuli unrelated to food reliably increase response rates, resistance to change, or preference. These data demonstrate the value of systematic replication, and a behavioral momentum approach to assessing potential reinforcement-like effects.     

Appearance‐Related Communication Mediates the Link Between Self‐Objectification and Health and Well‐Being Outcomes

Grounded in objectification theory, the 2 studies presented here predicted that self‐objectification is positively related to appearance‐related communication (i.e., fat talk and old talk), and, in turn, appearance‐related communication is associated with health and well‐being outcomes. Results from Study 1, which investigated only fat talk, revealed that fat talk significantly mediated the relationship between self‐objectification and body dissatisfaction, drive for thinness, bulimia, and self‐esteem. Study 2 sought to replicate the findings from Study 1, as well as extend appearance‐related communication to old talk. Fat talk was found to mediate the relationships between self‐objectification and body dissatisfaction, drive for thinness, bulimia, depression, and diet. Old talk significantly mediated the relationships between body dissatisfaction, drive for thinness, and bulimia.