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Adaptation level effects in discrimination of flicker frequency
John C Malone1, Maria E A Armento, Rita M Nemeth
1Department of Psychology, University of Tennessee, Psychology, Knoxville, TN 37996-0900, USA. jcmalone@utk.edu
Behavioural Processes
|January 28, 2004
Summary
Pigeons showed different responses to flickering light frequencies depending on whether the series increased or decreased. This suggests that the order of stimuli influences their perception and behavior.
Area of Science:
- Behavioral neuroscience
- Animal cognition
Background:
- Pigeons were trained to respond to a specific flicker frequency (25 Hz) for food reinforcement.
- Understanding how stimulus order affects learned responses is crucial in behavioral studies.
Purpose of the Study:
- To investigate the effect of ascending versus descending flicker frequency series on pigeon responding.
- To examine the influence of stimulus sequence on learned behavioral gradients.
Main Methods:
- Pigeons were exposed to ascending and descending series of flicker frequencies (13-37 Hz) during extinction periods.
- Reinforcement was occasionally provided at specific points within the series.
- Response gradients were analyzed for differences between ascending and descending series.
Main Results:
- Gradients of responding differed significantly between ascending and descending series.
- Peak responding shifted towards lower frequencies in ascending series and higher frequencies in descending series.
- These sequential effects were replicated with longer extinction periods and observed even when only a descending series was presented.
Conclusions:
- The order of stimulus presentation (ascending vs. descending) demonstrably influences learned responses in pigeons.
- Results support an adaptation level (AL) interpretation, where prior exposure affects perception of subsequent stimuli.
- Behavioral adaptation to flicker frequency is sensitive to sequential stimulus history.