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103_17_full - PSYC 103 Winter 2011 Lecture 17 Timing and...

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PSYC 103 Winter 2011 Lecture 17 Timing and Order Review session Tuesday Feb. 22 @ 8:00 PM Pepper canyon hall 109
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Timing Periodic timing: the ability of animals to respond at a particular time • Circadian rhythms • Nocturnal, diurnal, crepuscular Interval timing: the ability of animals to respond on the basis of specific durations Why be sensitive to time? Control patterns of activity • Measure rates of occurrence
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Peak procedure Weber’s law: the accuracy of the judgment is proportional to the magnitude of the stimulus
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Interval timing Temporal generalization Rats can be trained to remember multiple intervals • Lever press for food after a fixed duration of darkness • Responding to other durations produces a generalization gradient
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Three possible relationships between the duration of remembered time relative to the passage of actual time Interval timing How do animals compute intervals? need to estimate the actual and recall the remembered time Remembered time equals actual time Remembered time less than actual time Remembered time longer than actual time
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Subjective time Real time 0 60 s linear logarithmic Subjective time
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Result: A given interval of real time is subjectively the same whether it occurs at the beginning or end of a longer interval Time is measured linearly Subjective time follows real-time Time left to reward Time-left procedure Training: • Left lever: 60s • Right lever: 30s Testing: • present 30 s lever at different points in the 60 s interval
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Interval timing Bisecting the interval press left lever for long (12 s) tone • press right lever for short (3s) tone • test with intermediate duration tones for 50% r/l resp •If subtraction: midpoint=7.5 •If ratio: midpoint=6
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