Perception and Psychophysics

Covers all areas of research in sensory processes, perception, attention, and psychophysics. Includes reports on experimental work, reviews, and issue commentary important to researchers.

Articles from Vol. 68, No. 7, October

A Stereo Advantage in Generalizing over Changes in Viewpoint on Object Recognition Tasks
In four experiments, we examined whether generalization to unfamiliar views was better under stereo viewing or under nonstereo viewing across different tasks and stimuli. In the first three experiments, we used a sequential matching task in which observers...
Attentional Set for Axis of Symmetry in Symmetry-Defined Visual Search
Olivers and van der Helm (1998) showed that symmetry-defined visual search (for both symmetry and asymmetry) requires selective spatial attention. We hypothesize that an attentional set for the orientation of a symmetry axis also is involved in symmetry-defined...
Biases in the Perceived Timing of Perisaccadic Perceptual and Motor Events
Subjects typically experience the temporal interval immediately following a saccade as longer than a comparable control interval. One explanation of this effect is that the brain antedates the perceptual onset of a saccade target to around the time of...
Bimanual Curvature Discrimination of Hand-Sized Surfaces Placed at Different Positions
This study explores bimanual curvature discrimination of cylindrically curved, hand-sized surfaces. The setup was designed so that the postures of the observers' left and right arms and hands were the same as if the observers were holding a large object...
Binocular Shape Constancy from Novel Views: The Role of a Priori Constraints
We tested shape constancy from novel views in the case of binocular viewing, using a variety of stimuli, including polyhedra, polygonal lines, and points in 3-D. The results of the psychophysical experiments show that constraints such as planarity of...
Contextual Cuing by Global Features
In visual search tasks, attention can be guided to a target item-appearing amidst distractors-on the basis of simple features (e.g., finding the red letter among green). Chun and Jiang's (1998) contextual cuing effect shows that reaction times (RTs)...
Crossmodal Temporal Discrimination: Assessing the Predictions of a General Pacemaker-Counter Model
In this study, an extended pacemaker-counter model was applied to crossmodal temporal discrimination. In three experiments, subjects discriminated between the durations of a constant standard stimulus and a variable comparison stimulus. In congruent...
Manual Exploration and the Perception of Slipperiness
In this article, we report on two experiments that examined the haptic perception of slipperiness. The first experiment aimed to determine whether the type of finger motion across a surface influenced the ability to accurately judge the frictional coefficient...
Multisensory Synesthetic Interactions in the Speeded Classification of Visual Size
In the present study, we attempted to demonstrate a synesthetic relationship between auditory frequency and visual size. In Experiment 1, participants performed a speeded visual size discrimination task in which they had to judge whether a variable-sized...
On the Causes of Compensation for Coarticulation: Evidence for Phonological Mediation
This study examined whether compensation for coarticulation in fricative-vowel syllables is phonologically mediated or a consequence of auditory processes. Smits (2001a) had shown that compensation occurs for anticipatory lip rounding in a fricative...
Stimulus Modality Interacts with Category Structure in Perceptual Category Learning
Two experiments were conducted that examined information integration and rule-based category learning, using stimuli that contained auditory and visual information. The results suggest that it is easier to perceptually integrate information within these...
The Intensity-Difference Limen for 6.5 kHz: An Even More Severe Departure from Weber's Law
Intensity-difference limens (DLs) were obtained for tones of 6.5 kHz over levels of 30-90 dB SPL. The tones had Gaussian-shaped envelopes whose duration was expressed as equivalent rectangular duration D, that of a rectangle enclosing the same area as...
The Return of Object-Based Attention: Selection of Multiple-Region Objects
Objects can control the focus of attention, allowing features on the same object to be selected more easily than features on different objects. In the present experiments, we investigated the perceptual processes that contribute to such object-based...
The Simon Effect and Handedness: Evidence for a Dominant-Hand Attentional Bias in Spatial Coding
In two experiments, the relation between handedness and the size of the Simon effect in each visual hemifield was investigated. Experiment 1 showed that the Simon effect was larger in the right visual hemifield in right-handers and in the left visual...
Visual Onset Expands Subjective Time
We report a distortion of subjective time perception in which the duration of a first interval is perceived to be longer than the succeeding interval of the same duration. The amount of time expansion depends on the onset type defining the first interval....
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