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W

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Acceleration at the start of a session leading to the level of performance characteristic of the bulk of the session.
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A low or zero response rate at the start of a session followed by-an increase to the rate maintained later, especially in avoidance performances.
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A stimulus that precedes an aversive condition and thus becomes a learned aversive stimulus.
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See magazine.
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See Stimulus control, incomplete. 15
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The body-weight of the animal usually measured at the beginning of the daily experiment.
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Sometimes taken as an index of level of activity, especially in rats runs inside the wheel, which usually turns in only one direction to simplify recording of revolutions or distance run. Wheel running has a high baseline level and is relatively continuous compared to such discrete responses as lever-presses.
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A direct observational procedure in which the presence or absence of specific behaviors is recorded within short uniform time intervals. (E.g., an observer observes for 10 seconds and records the occurrence or nonoccurrence of a behavior during the following 5 seconds.) This procedure may continue for a specific 30-minute period each day. Time-sampling variations include. (1) Whole-interval time-sampling, (2) partial-interval time-sampling, and (3) momentary time-sampling. 5
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See Concurrent task method of teaching. 20
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See Differential reinforcement of other behaviors (DRO). 24

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