Form Perception

111.

Active haptic detection and discrimination of shape.

In previous research, we have shown that detection thresholds for Gaussian shapes increase with a power of 1.3 of spatial width. In the present three experiments, we generalized this finding to more complex shapes and to discrimination tasks. In ...
S Louw, A M L Kappers, J J Koenderink (Percept Psychophys, 200210)
active-haptic-detection-discrimination-shape.asp

112.

Roles of salience and strategy in conjunction search.

In some cases, the search for a conjunction target proceeds through the smaller group of elements in a display, whereas in others, search is limited to those elements that share a particular feature with the target. In 6 experiments, participants ...
Kenith V Sobel, Kyle R Cave (J Exp Psychol Hum Percept Perform, 200210)
roles-salience-strategy-conjunction-search.asp

113.

The perception and discrimination of local 3-D surface structure from deforming and disparate boundary contours.

In a series of four experiments, we evaluated observers abilities to perceive and discriminate ordinal depth relationships between separated local surface regions for objects depicted by static, deforming, and disparate boundary contours or silhouettes. ...
J Farley Norman, Shane R Raines (Percept Psychophys, 200210)
perception-discrimination-local-d-surface-structure-deforming.asp

114.

Electroencephalographic activity in a flanker interference task using Japanese orthography.

The neural activities for color word interference effects were investigated using event-related brain potentials (ERPs) recorded in a flanker-type interference task. Kanji words (Japanese morphograms) and kana words (Japanese phonograms) were used as the ...
Shuhei Yamaguchi, Genya Toyoda, Jiang Xu, Shotai Kobayashi, Avishai Henik (J Cogn Neurosci, 200210)
electroencephalographic-activity-flanker-interference-task-japanese.asp

115.

The role of complex cells in object recognition.

Primates primary visual cortex (V1) is dominated by complex cells. This choice of nature seems puzzling, as complex cells are insensitive to spatial phase--information which is generally believed to be essential for perceptual characterization and ...
Ladan Shams, Christoph von der Malsburg (Vision Res, 200210)
role-complex-cells-object-recognition.asp

116.

Common mechanisms for 2D tilt and 3D slant after-effects.

By presenting oriented Gabor patches either monocularly or binocularly, we dissociated retinal orientation from perceived tilt and perceived slant. After adapting to binocular patches, with zero apparent tilt and non-zero slant, small tilt after-effects ...
Wendy J Adams, Pascal Mamassian (Vision Res, 200210)
common-mechanisms-d-tilt-d-slant-after-effects.asp

117.

Systematic distortion of perceived 2D shape during smooth pursuit eye movements.

Even when the retinal image of a static scene is constantly shifting, as occurs when the viewer pursues a small moving object with his or her eyes, the scene is usually correctly perceived to be static. Following early suggestions by von Helmholtz, it is ...
Hyung-Chul O Li, Eli Brenner, Frans W Cornelissen, Eun-Soo Kim (Vision Res, 200210)
systematic-distortion-perceived-d-shape-smooth-pursuit-eye-movements.asp

118.

A study of parallel implicit and explicit information processing in patients with obsessive-compulsive disorder.

OBJECTIVE: This study examined implicit sequence learning in patients with obsessive-compulsive disorder (OCD) under dual-task conditions. Frontal-striatal networks support implicit learning and are implicated in the pathophysiology of OCD. Neuroimaging ...
Thilo Deckersbach, Cary R Savage, Tim Curran, Antje Bohne, Sabine Wilhelm, Lee Baer, Michael A Jenike, Scott L Rauch (Am J Psychiatry, 200210)
study-parallel-implicit-explicit-information-processing-patients.asp

119.

Dissociation between location and shape in visual space.

There are often large perceptual distortions of shapes lying on the ground plane, even in well-lit environments. These distortions occur under conditions for which the perception of location i saccurate. Four hypotheses are considered for reconciling ...
Jack M Loomis, John W Philbeck, Pavel Zahorik (J Exp Psychol Hum Percept Perform, 200210)
dissociation-location-shape-visual-space.asp

120.

Comparisons among tools, surface orientation, and pencil grasp for children 23 months of age.

OBJECTIVE: The purpose of this study was to determine whether writing tool type and angle of writing surface affect grasp. METHOD: Fifty-one children 23 to 24 months of age who were typically developing drew with a primary marker, colored pencil, and ...
Janet E Yakimishyn, Joyce Magill-Evans (Am J Occup Ther, 200209-10)
comparisons-tools-surface-orientation-pencil-grasp-children-months.asp