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Related Experiment Videos

Range effects in successive discrimination.

J M Hinson, G R Lockhead

    Journal of Experimental Psychology. Animal Behavior Processes
    |July 1, 1986
    PubMed
    Summary
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    Pigeons

    Area of Science:

    • Animal behavior and psychophysics, focusing on sensory perception and decision-making.

    Background:

    • Pigeons (Columba livia) have been extensively studied for their cognitive abilities.
    • Discrimination tasks are crucial for understanding how animals perceive and categorize stimuli.

    Purpose of the Study:

    • To investigate how the range of a visual stimulus set influences pigeons' discrimination performance.
    • To explore the underlying mechanisms of range effects in animal psychophysics.

    Main Methods:

    • Utilizing a successive discrimination procedure with a visual flicker-rate continuum.
    • Implementing two experimental designs manipulating reinforcement schedules across stimulus ranges.

    Main Results:

    • Pigeons' discrimination accuracy was significantly affected by the overall range of the stimulus set.

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  • Range effects observed in pigeons are comparable to those seen in human absolute judgment tasks.
  • These effects appear to be related to judgment criteria variability, not channel capacity.

    • Conclusions:

    • The perceived value of a stimulus is relative and influenced by the context of the entire stimulus set.
    • Judgment criteria variability plays a key role in range effects, offering insights into perceptual decision-making.
    • Findings contribute to understanding comparative psychophysics and the general principles of sensory discrimination.