Affiliation:
1. McMaster University, Hamilton, Canada
Abstract
In atemporal bisectiontask with humans, the observer is required to decide whether a probe duration (t) is more similar to the short referent (S), an R S response, or to the long referent (L), an R L response. Temporal bisection yields a psychometric function relating the proportion of long responses, P(R L), to probe duration t. The value of t at which R S and R L occur with equal frequency, P(RL) =.5, is referred to as the bisection point, T 1/2. Bisection models usually interpret T 1/2 as identifying the value of t that is equally confusable with S and L, but they differ in their predictions for the location of T 1/2. The present paper presents new data relevant to the location and interpretation of T 1/2. The data indicate that the empirical values usually are biased, the biases being influenced by duration range, L:S ratio, and probe spacing. Moreover, the biases often are not consistent across observers. It is concluded that empirical values of T 1/2 should not be interpreted as indicating the value of t that is equally confusable with S and L.
Subject
Physiology (medical),General Psychology,Experimental and Cognitive Psychology,Neuropsychology and Physiological Psychology,Physiology
Cited by
63 articles.
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