Stimulus fluctuation, reactive inhibition, and time between trials in classical eyelid conditioning.

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Abstract
Predictions from the constructs of reactive inhibition and stimulus-element sampling were tested in human classical eyelid conditioning by manipulating both mean intertrial interval (ITI) and ITI variability. The major findings were that the mean acquisition curve was unaffected by whether or not the ITI was fixed or varied, response probability, latency, and topography were conditional on the duration of the immediately preceding ITIs, and the typical massed-spaced effect appears to result from a scoring bias imposed by a failure to adjust for incomplete latency distributions. Unambiguous support for neither of the tested constructs was obtained, and an interpretation in terms of temporal cues in the situation was suggested.

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