Visual Perception

641.

Attention to action: specific modulation of corticocortical interactions in humans.

The prefrontal cortex may exert cognitive control by a general mechanism of attentional selection of neuronal representations. We used functional magnetic resonance imaging to test this hypothesis in the motor system. Normal volunteers were scanned ...
James Rowe, Karl Friston, Richard Frackowiak, Richard Passingham (Neuroimage, 200210)
attention-action-specific-modulation-corticocortical-interactions.asp

642.

A probabilistic explanation of brightness scaling.

The perceptions of lightness or brightness elicited by a visual target are linked to its luminance by a nonlinear function that varies according to the physical characteristics of the target and the background on which it is presented. Although no ...
Surajit Nundy, Dale Purves (Proc Natl Acad Sci U S A, 200210)
probabilistic-explanation-brightness-scaling.asp

643.

Visual discrimination testing of ultraviolet transmitting and ultraviolet blocking acrylic thermoplastics.

BACKGROUND: Visual perception has hindered the development of blinded, placebo-controlled ultraviolet light exposure conditions in humans. New acrylic thermoplastics that block or transmit ultraviolet light have visual properties that may provide a ...
Michael J Kucenic, Manisha Patel, Steven R Feldman, Anthony Liguori, Alan B Fleischer (Photodermatol Photoimmunol Photomed, 200210)
visual-discrimination-testing-ultraviolet-transmitting-ultraviolet.asp

644.

Four heads are better than one: combining face composites yields improvements in face likeness.

Four participants constructed face composites, of familiar and unfamiliar targets, using Pro-Fit, with reference images present or from memory. The "mean" of all 4 composites, created by morphing (4-morph) was rated as a better likeness than individual ...
Vicki Bruce, Hayley Ness, Peter J B Hancock, Craig Newman, Jenny Rarity (J Appl Psychol, 200210)
four-heads-better-one-combining-face-composites-yields-improvements.asp

645.

Dynamics of cortico-subcortical cross-modal operations involved in audio-visual object detection in humans.

Very recently, a number of neuroimaging studies in humans have begun to investigate the question of how the brain integrates information from different sensory modalities to form unified percepts. Already, intermodal neural processing appears to depend ...
Alexandra Fort, Claude Delpuech, Jacques Pernier, Marie-Hélène Giard (Cereb Cortex, 200210)
dynamics-cortico-subcortical-cross-modal-operations-involved-audio.asp

646.

Functional imaging of the mechanisms underlying the bilateral field advantage.

Visual stimulus comparisons across the vertical meridian are faster and more accurate than those restricted to a single hemifield (the bilateral field advantage). We set out to investigate the cerebral mechanisms underlying this effect using functional ...
A M Santhouse, D H Ffytche, R J Howard, S C R Williams, L Rifkin, R M Murray (Neuroimage, 200210)
functional-imaging-mechanisms-underlying-bilateral-field-advantage.asp

647.

Range image statistics can explain the anomalous perception of length.

A long-standing puzzle in visual perception is that the apparent extent of a spatial interval (e.g., the distance between two points or the length of a line) does not simply accord with the length of the stimulus but varies as a function of orientation ...
Catherine Q Howe, Dale Purves (Proc Natl Acad Sci U S A, 200210)
range-image-statistics-explain-anomalous-perception-length.asp

648.

Variability of EEG synchronization during a working memory task in healthy subjects.

Working memory is associated with an increase in EEG theta synchronization and a decrease in lower alpha band synchronization. We investigated whether such changes in mean synchronization level are accompanied by changes in small scale fluctuations of ...
Cornelis J Stam, Anne-Marie van Cappellen van Walsum, Sifis Micheloyannis (Int J Psychophysiol, 200210)
variability-eeg-synchronization-working-memory-task-healthy-subjects.asp

649.

Semantic distance effects on object and action naming.

Graded interference effects were tested in a naming task, in parallel for objects and actions. Participants named either object or action pictures presented in the context of other pictures (blocks) that were either semantically very similar, or somewhat ...
Gabriella Vigliocco, David P Vinson, Markus F Damian, Willem Levelt (Cognition, 200210)
semantic-distance-effects-object-action-naming.asp

650.

Opposite effects on perception and action induced by the Ponzo illusion.

This study investigated the effects of the Ponzo illusion on three tasks: manual estimation of target width and peak grip aperture during pantomimed and natural prehension. The targets were three discs of 25 mm height and 20, 40 and 60 mm diameter. ...
Robert Bartelt, Warren G Darling (Exp Brain Res, 200210)
opposite-effects-perception-action-induced-ponzo-illusion.asp