Visual Perception

51.

Saccadic and perceptual performance in visual search tasks. I. Contrast detection and discrimination.

Humans use saccadic eye movements when they search for visual targets. We investigated the relationship between the visual processing used by saccades and perception during search by comparing saccadic and perceptual decisions under conditions in which ...
Brent R Beutter, Miguel P Eckstein, Leland S Stone (J Opt Soc Am A Opt Image Sci Vis, 200307)
saccadic-perceptual-performance-visual-search-tasks-contrast.asp

52.

When does action resist visual illusions? Effector position modulates illusory influences on motor responses.

Actors viewed horizontal segments either in isolation or embedded in patterns that produce spatial illusory effects (Kanizsas compression illusion and the "dumbbell" version of the Müller-Lyer compression-expansion illusion). They were asked to reproduce ...
Nicola Bruno, Paolo Bernardis (Exp Brain Res, 200307)
action-resist-visual-illusions-effector-position-modulates-illusory.asp

53.

Saccadic and perceptual performance in visual search tasks. II. Letter discrimination.

Can the oculomotor system use shape cues to guide search saccades? Observers searched for target letters (D, U, or X) among distractors (the letter O in the discrimination task and blank locations in the detection task) in Gaussian white noise. We ...
Richard F Murray, Brent R Beutter, Miguel P Eckstein, Leland S Stone (J Opt Soc Am A Opt Image Sci Vis, 200307)
saccadic-perceptual-performance-visual-search-tasks-ii-letter.asp

54.

Local computation of angular velocity in rotational visual motion.

Retinal images evolve continuously over time owing to self-motions and to movements in the world. Such an evolving image, also known as optic flow, if arising from natural scenes can be locally decomposed in a Bayesian manner into several elementary ...
José F Barraza, Norberto M Grzywacz (J Opt Soc Am A Opt Image Sci Vis, 200307)
local-computation-angular-velocity-rotational-visual-motion.asp

55.

Modeling global scene factors in attention.

Models of visual attention have focused predominantly on bottom-up approaches that ignored structured contextual and scene information. I propose a model of contextual cueing for attention guidance based onthe global scene configuration. It is shown that ...
Antonio Torralba (J Opt Soc Am A Opt Image Sci Vis, 200307)
modeling-global-scene-factors-attention.asp

56.

Lateralized cognitive processes and lateralized task control in the human brain.

The principles underlying human hemispheric specialization are poorly understood. We used functional magnetic resonance imaging of letter and visuospatial decision tasks with identical word stimuli to address two unresolved problems. First, hemispheric ...
Klaas E Stephan, John C Marshall, Karl J Friston, James B Rowe, Afra Ritzl, Karl Zilles, Gereon R Fink (Science, 200307)
lateralized-cognitive-processes-lateralized-task-control-human-brain.asp

57.

Whats so special about human tool use?

Evidence suggests homologies in parietofrontal circuits involved in object prehension among humans and monkeys. Likewise, tool use is known to induce functional reorganization of their visuotactile limb representations. Yet, humans are the only species ...
Scott H Johnson-Frey (Neuron, 200307)
s-special-human-tool-use.asp

58.

Sustained division of the attentional spotlight.

By voluntarily directing attention to a specific region of a visual scene, we can improve our perception of stimuli at that location. This ability to focus attention upon specific zones of the visual field has been described metaphorically as a moveable ...
M M Müller, P Malinowski, T Gruber, S A Hillyard (Nature, 200307)
sustained-division-attentional-spotlight.asp

59.

Infant lightness perception: do 4-month-old infants follow Wallachs ratio rule?

When adults view a test disk embedded in a higher-luminance surround, the perceived lightness of the disk is largely determined by the surround-to-disk (S/D) luminance ratio (Wallachs ratio rule). Performance of 4-month-old infants tested with a ...
Sarina Hui-Lin Chien, John Palmer, Davida Y Teller (Psychol Sci, 200307)
infant-lightness-perception-month-old-infants-follow-wallach-s-ratio.asp

60.

Detection of visual change: mismatch or rareness?

How do we detect changes in our visual environment? By continuously comparing visual inputs to templates of experiences in the immediate past? Or by determining their rareness, how infrequently a visual event occurred previously? Recent results from ...
J Leon Kenemans, Tineke Grent-t Jong, Marinus N Verbaten (Neuroreport, 200307)
detection-visual-change-mismatch-or-rareness.asp