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)

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)

The intriguing possibility has emerged that the mechanisms processing information concerning different attributes might arrive at incompatible conclusions, so that stimuli are perceived which have paradoxical properties. This study demonstrated just such a situation. (Author/RK)

A series of experiments was conducted to determine aspects of both perceptual and motor processing for the consonant cluster (st). (Editor)

In order to examine the degree to which form perception affects the formation of apparent-motion experience, subjects were presented with nine ambiguous apparent-motion situations, where the elements of each single flash were various figures. (Editor)

It was hypothesized that a moving or stationary observer who samples an ambient optic array specific to egomotion over a flat plain obtains a phenomenal experience of egomotion over that environment and further that the focus of expansion need not be present in the optic array sample for an observer to perceive his heading and egomotion.…

Attempts to determine the extent that typicality effects obtained in previous research on natural semantic categories could be obtained in artificial categories purely as a function of structural principles when the frequency and nature of experience with items were controlled. (Author/RK)

Phonological fusion occurs when the phonemes of two different speech stimuli are combined into a new percept that is longer and linguistically more complex than either of the two inputs. The present article is an investigation of the conditions necessary and sufficient for fusion to occur. (Editor/RK)

This paper addressed itself to the general question of the depth of processing required for lexical decision. (Author/RK)