Visual Perception

471.

Orienting of attention without awareness is affected by measurement-induced attentional control settings.

McCormick (1997) concluded that peripheral cues presented below a threshold of awareness could nevertheless attract attention because they facilitated target processing near the cue shortly after its presentation. Yet, whereas an exogenous shift of ...
Jason Ivanoff, Raymond M Klein (J Vis, 2003)
orienting-attention-awareness-affected-measurement-induced.asp

472.

Perceptual organization and Whites illusion.

The apparent lightness of a surface can be strongly modulated by the spatial context in which it is embedded. Early theories of such context dependence emphasized the role of low-level mechanisms that sense border contrast, whereas a number of recent ...
Barton L Anderson (Perception, 2003)
perceptual-organization-white-s-illusion.asp

473.

Perceptual switching, eye movements, and the bus paradox.

According to a widely cited finding by Ellis and Stark (1978 Perception 7 575-581), the duration of eye fixations is longer at the instant of perceptual reversal of an ambiguous figure than before or after the reversal. However, long fixations are more ...
Junji Ito, Andrey R Nikolaev, Marjolein Luman, Maartje F Aukes, Chie Nakatani, Cees van Leeuwen (Perception, 2003)
perceptual-switching-eye-movements-bus-paradox.asp

474.

Dopaminergic modulation of visual-spatial working memory in Parkinsons disease.

Visual-spatial working memory (WM) impairment is frequently associated with the early stage of Parkinsons disease (PD). The aim of this study was to evaluate the performance of a group of PD patients in visual-spatial and visual-object WM tasks and to ...
Alberto Costa, Antonella Peppe, Grazia DellAgnello, Giovanni Augusto Carlesimo, Luigi Murri, Ubaldo Bonuccelli, Carlo Caltagirone (Dement Geriatr Cogn Disord, 2003)
dopaminergic-modulation-visual-spatial-working-memory-parkinson-s.asp

475.

Mach bands change asymmetrically during solar eclipses.

Observations made during two partial eclipses of the Sun show that the Mach bands on shadows cast by the Sun disappear and reappear asymmetrically as an eclipse progresses. These changes can be explained as due to changes in the shape of the penumbras of ...
John Ross, Mark R Diamond, David R Badcock (Perception, 2003)
mach-bands-change-asymmetrically-solar-eclipses.asp

476.

Interhemispheric visual interaction in a patient with posterior callosectomy.

The role of anterior commissure (AC) and anterior parts of corpus callosum in visual interactions was investigated in a partial split-brain patient whose posterior and middle parts of the corpus callosum were resected surgically leaving intact only a ...
S R Afraz, L Montaser-Kouhsari, M Vaziri-Pashkam, F Moradi (Neuropsychologia, 2003)
interhemispheric-visual-interaction-patient-posterior-callosectomy.asp

477.

Attention and its disorders.

This chapter focuses on the clinical aspects of attention including anatomy, cognitive neuropsychology, disorders, and functional imaging evidence for the role of attention in cognition. Particular emphasis is given to selected aspects of visual ...
Darren R Gitelman (Br Med Bull, 2003)
attention-disorders.asp

478.

Visual object and face processing in mild-to-moderate Alzheimers disease: from segmentation to imagination.

Little is known about the fate of higher level visual perception and visual mental imagery in the early stages of Alzheimers disease (AD). In this study, we assessed these abilities in a group of mild-to-moderate AD patients using tasks selected to ...
Lynette J Tippett, Kirsty Blackwood, Martha J Farah (Neuropsychologia, 2003)
visual-object-face-processing-mild-moderate-alzheimer-s-disease.asp

479.

Flicker flutter: is an illusory event as good as the real thing?

Verghese and Stone (1995) showed that reducing the perceived number of objects by grouping also reduces objective performance. Shams, Kamitani, and Shimojo (2000) showed that a single flash accompanied by multiple beeps appears to flash more than once. ...
Tracey D Berger, Marialuisa Martelli, Denis G Pelli (J Vis, 2003)
flicker-flutter-illusory-event-good-real-thing.asp

480.

Configural biases and reversible figures: evidence of multilevel grouping effects.

Four experiments sought to identify the processes underlying 2 classes of grouping effects that are readily produced with a hierarchical figure type known as ambiguous triangles. Previous work has shown that aligning small equilateral triangles in ...
Gerald M Long, Joseph A Stewart, Diane E Glancey (Am J Psychol, 2002WINTER)
configural-biases-reversible-figures-evidence-multilevel-grouping.asp