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Related Experiment Videos

What starts an internal clock?

S Roberts, M D Holder

    Journal of Experimental Psychology. Animal Behavior Processes
    |July 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    Rats

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    Area of Science:

    • Behavioral Neuroscience
    • Cognitive Psychology

    Background:

    • The internal clock mechanism is crucial for time discrimination.
    • Understanding when internal clocks are engaged is key to understanding temporal cognition.

    Purpose of the Study:

    • To investigate the conditions under which stimuli are timed by the internal clock.
    • To determine if the internal clock processes stimuli across different modalities based on their associative value.

    Main Methods:

    • Rats were trained to discriminate time using one stimulus modality.
    • A second stimulus from a different modality was presented alone, paired with food, or extinguished.
    • Time-discrimination performance was assessed using the peak procedure and a psychophysical choice procedure.

    Main Results:

    Related Experiment Videos

    • Cross-modal transfer of time discrimination occurred only when the second stimulus was paired with food.
    • No transfer was observed when the stimulus was merely exposed or extinguished.
    • Experiment 5 indicated that extinction effects are not due to altered timing mechanisms.

    Conclusions:

    • The internal clock appears to time stimuli that possess signal value (associative strength).
    • Stimuli lacking signal value are not processed by the internal clock for time discrimination.
    • Associative learning plays a critical role in engaging the internal clock for temporal processing.