Research article summary:

Functional anatomy and differential time courses of neural processing for explicit, inferred, and illusory contours. An event-related fMRI study.

Abstract Extract:
The perception of shape does not necessarily require viewing an explicit outline figure. Using event-related functional magnetic resonance imaging we examined the time courses of neural activations provoked by shapes defined by (1) lines, (2) illusory ... (Full abstract text below)

Published 2003Aug in Journal: Neuroimage (Language : eng)

Full Pubmed Extract

This information was retrieved, real-time, on your behalf from the public area of the Pubmed website:

1. Neuroimage. 2003 Aug;19(4):1567-77

Functional anatomy and differential time courses of neural processing for explicit, inferred, and illusory contours. An event-related fMRI study.

Ritzl A, Marshall JC, Weiss PH, Zafiris O, Shah NJ, Zilles K, Fink GR

Institut für Medizin, Forschungszentrum Jülich, 52425 Jülich, Germany.

The perception of shape does not necessarily require viewing an explicit outline figure. Using event-related functional magnetic resonance imaging we examined the time courses of neural activations provoked by shapes defined by (1) lines, (2) illusory contour inducers, and (3) reversed inducers. SPM99 was used to analyze the common and differential neural responses associated with the stimuli and their temporal derivatives. Illusory figures versus reversed inducers activated extrastriate cortex. Reversed inducers versus illusory figures activated the right parietal cortex. For both illusory and line contours versus reversed inducers, analysis of the temporal derivatives showed earlier activations in extrastriate and left parietal cortex and for line contours also in the extrastriate cortex bilaterally and in the right parietal cortex; these earlier activations were mirrored by differences in reaction times with subjects responding more slowly to shapes defined by reversed inducers. The results show substantial bottom-up effects (in occipital cortex) in the recognition of illusory and explicit shapes. By contrast, in stimuli where the shape must be inferred, there is greater reliance on right parietal cortex, consistent with increased attentional demands and top-down processing. The temporal derivatives provide useful information on the differential timing of the associated hemodynamic responses in occipital, parietal, and motor cortex.

PMID : 12948712 [PubMed - Indexed for MEDLINE]

This information is obtained from the National Library of Medicine (NLM). Abstract text and other information may be subject to copyright. Type "NLM copyright" into Google for more information.

Full Author Information

First Name	LastName	Initials
Afra	Ritzl	A
John C	Marshall	JC
Peter H	Weiss	PH
Oliver	Zafiris	O
Nadim J	Shah	NJ
Karl	Zilles	K
Gereon R	Fink	GR

Affiliation: Institut für Medizin, Forschungszentrum Jülich, 52425 Jülich, Germany.

3rd Party provider links

Click the links below to go to related 3rd party information:

MESH categories and related page links

This article was linked to the MESH categories shown on the left below. The links on the right are related Memletics pages.

Links for this article

For links to places where you can get the full text of this article see links. Note there may be a subscription or fee required for access to the full text.

New! Using similar technology to this site, we have launched find-health-articles.com, targeting over 1 million health research article abstracts.

Here are some articles related to this one (by title keywords):

Investigating users requirements: computer-based anatomy learning modules for multiple user test beds.

Interleukin-6 expression after repeated bouts of eccentric exercise.

Importance of dissection in learning anatomy: personal dissection versus peer teaching.

Implicit and explicit learning in schizophrenics treated with olanzapine and with classic neuroleptics.

Wavelet-based estimation of a semiparametric generalized linear model of fMRI time-series.

Timing, clocks, and dynamical systems.

Teaching gross anatomy using living tissue.

The regulation of explicit and implicit race bias: the role of motivations to respond without prejudice.

The neural basis of human error processing: reinforcement learning, dopamine, and the error-related negativity.

Cortical plasticity: time for a change.

>>> Get more research article abstracts like these, or browse abstracts.

Keywords in this article:

activated, activations, analysis, analyze, associated, attentional, bilaterally, bottom, common, consistent, contour, contours, contrast, cortex, courses, defined, demands, derivatives, differences, differential, down, earlier, effects, event, examined, explicit, extrastriate, figure, figures, functional, greater, hemodynamic, illusory, imaging, increased, inducers, inferred, information, left, lines, magnetic, mirrored, more, motor, necessarily, neural, not, occipital, outline, parietal, perception, processing, provide, provoked, reaction, recognition, related, reliance, require, resonance, responding, responses, results, reversed, right, shape, shapes, slowly, spm, stimuli, subjects, substantial, temporal, time, times, timing, top, up, useful, versus, viewing, where

Also, see our new free speed reading online course (beta version)