The purpose of this study was to establish a theoretical framework for Stevens' empirically derived power law. Three models were proposed to explain the power law. (Editor)

Nonspeech stimuli were varied along two dimensions--intensity and rise time. In a series of speeded classification tasks, subjects were asked to identify the stimuli in terms of one of these dimensions. (Editor)

As part of a search for a unified theory of attention, observers detected letters in streams of digits under conditions of divided or selective attention for a period of 10 hours. The practice effects on the detectability of targets and on the response criteria used by observers were evaluated. (Editor/RK)

Examines an alternation effect and a repetition effect in a two-choice reaction time task. Two further experiments examine the roles of subjective expectancy and an automatic facilitation in determining these effects. (Editor/RK)

Two new experimental operations were used to distinguish between auditory and phonetic levels of processing in speech perception: the first based on reaction time data in speeded classification tasks with synthetic speech stimuli, and the second based on average evoked potentials recorded concurrently in the same tasks. (Editor)

Examines the hypothesis that the identification of a briefly presented visual target is impeded by a patterned mask that immediately precedes and/or follows it. (Author/RK)

A series of experiments tested a recent suggestion that vertical symmetry of a stimulus display can serve as a visual diagnostic for responding "same" in a letter-matching task. The data of chief interest were same reaction times to vertically symmetric (e.g., AA) and asymmetric (e.g., LL) displays, each composed of two side-by-side uppercase…

Attempts to establish the degree of perspective convergence, which the Western observer will accept as a realistic portrayal of objects drawn in perspective, and to determine the relationship between acceptable convergence and viewing conditions. (Author/RK)

Considers listener expectancies based on timing redundancy in continuous speech and the interaction between the effects of segmental and suprasegmental cues during ongoing perception. (Editor/RK)