Form Perception

141.

N400 and automatic semantic processing abnormalities in patients with schizophrenia.

BACKGROUND: One factor hypothesized to underlie thinking disturbance in patients with schizophrenia is abnormal or disinhibited automatic spreading activation of semantic networks, which can be assessed using the N400 event-related potential. N400 is a ...
Daniel H Mathalon, William O Faustman, Judith M Ford (Arch Gen Psychiatry, 200207)
n-automatic-semantic-processing-abnormalities-patients-schizophrenia.asp

142.

Orientation-selective summing mechanisms revealed in visual search.

We investigated properties of the neural mechanisms that mediate detection of complex grating targets in an orientation-based visual search task. Targets and distractors were composed of small patches of compound sinusoidal gratings. Components were ...
Kevin A Laack, Lynn A Olzak (Vision Res, 200207)
orientation-selective-summing-mechanisms-revealed-visual-search.asp

143.

The spatiotemporal dynamics of illusory contour processing: combined high-density electrical mapping, source analysis, and functional magnetic resonance imaging.

Because environmental information is often suboptimal, visual perception must frequently rely on the brains reconstruction of contours absent from retinal images. Illusory contour (IC) stimuli have been used to investigate these "filling-in" processes. ...
Micah M Murray, Glenn R Wylie, Beth A Higgins, Daniel C Javitt, Charles E Schroeder, John J Foxe (J Neurosci, 200206)
spatiotemporal-dynamics-illusory-contour-processing-combined-high.asp

144.

Magnitude comparisons distort mental representations of magnitude.

Many cognitive processes rely on representations of magnitude, yet these representations are often malleable (H. Helson, 1964; J. Huttenlocher, L. V. Hedges, & J. L. Vevea, 2000; A. Parducci, 1965). It is likely that factors that affect these ...
Jessica M Choplin, John E Hummel (J Exp Psychol Gen, 200206)
magnitude-comparisons-distort-mental-representations-magnitude.asp

145.

Lower region: a new cue for figure-ground assignment.

Figure-ground assignment is an important visual process; humans recognize, attend to, and act on figures, not backgrounds. There are many visual cues for figure-ground assignment. A new cue to figure-ground assignment, called lower region, is presented: ...
Shaun P Vecera, Edward K Vogel, Geoffrey F Woodman (J Exp Psychol Gen, 200206)
lower-region-new-cue-figure-ground-assignment.asp

146.

Color appearance of spatial pattern: the role of increments and decrements.

In a number of recent adaptational studies evidence for a different processing of incremental and decremental cone signals has been reported. The present study examined whether such asymmetries occur in spatial pattern as well. Subjects set color matches ...
Karl-Heinz Bäuml (Vision Res, 200206)
color-appearance-spatial-pattern-role-increments-decrements.asp

147.

Normal readers have an upper visual field advantage in change detection.

The ability to detect change has not been well studied in children.A research paradigm was used involving search for a change made to one of four letter targets, presented twice, with a gap of 250 ms.Sixty-one schoolchildren, aged 7.3 - 12.9 ...
Jacqueline S Rutkowski, David P Crewther, Sheila G Crewther (Clin Experiment Ophthalmol, 200206)
normal-readers-upper-visual-field-advantage-change-detection.asp

148.

Remote viewing with the artist Ingo Swann: neuropsychological profile, electroencephalographic correlates, magnetic resonance imaging (MRI), and possible mechanisms.

In the present study, the artist Ingo Swann, who helped develop the process of remote viewing (awareness of distant objects or places without employing normal senses), was exposed during a single setting of 30 min. to specific patterns of circumcerebral ...
M A Persinger, W G Roll, S G Tiller, S A Koren, C M Cook (Percept Mot Skills, 200206)
remote-viewing-artist-ingo-swann-neuropsychological-profile.asp

149.

Outline shape is a mediator of object recognition that is particularly important for living things.

We assess the importance of outline shape in mediating the recognition of living and nonliving things. Natural objects were presented as shaded line drawings or silhouettes, and were living and nonliving things. For object decision (deciding whether an ...
Toby J Lloyd-Jones, Linda Luckhurst (Mem Cognit, 200206)
outline-shape-mediator-object-recognition-particularly-important.asp

150.

Eliminating the cost of task set reconfiguration.

With insufficient time to fully prepare for a switch in task, a deterioration in performance on the first trial of a new task would be expected. The interest of researchers has been captured by the residual switch costs that, surprisingly, remain despite ...
Amelia R Hunt, Raymond M Klein (Mem Cognit, 200206)
eliminating-cost-task-set-reconfiguration.asp