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| Research article summary (published 30 Dec 2002): |
Efficient acquisition of human retinotopic maps.
Full Abstract
A bifield stimulation method for rapidly obtaining retinotopic maps in human occipital cortex using functional MRI was compared to conventional unifield stimulation. While maintaining central fixation, each participant viewed the conventional display, consisting of a single rotating checkerboard wedge and, in a separate run, the bifield display, consisting of two symmetrically placed rotating checkerboard wedges (a "propeller" configuration). Both stimulus configurations used wedges with 30 degree polar angle width, 6.8 degrees visual angle extension from fixation, and 8.3 Hz contrast polarity reversal rate. Retinotopic maps in each condition were projected onto a distortion corrected computationally flattened cortical surface representation obtained from a high-resolution structural MRI. An automated procedure to localize borders between early visual areas revealed, as expected, that map precision increased with duration of data acquisition for both conditions. Bifield stimulation required 40% less time to yield maps with similar precision to those obtained using conventional unifield stimulation.Copyright 2002 Wiley-Liss, Inc.
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Author information
Author/s: Slotnick, Scott D (SD); Yantis, Steven (S);
Affiliation: Department of Psychology, Harvard University, 33 Kirkland Street, Cambridge, MA 02138, USA. slotnick(-atsign-)wjh.harvard.edu
Grants: DE 13165 (Agency:United States NIDCR) ; MH 19971 (Agency:United States NIMH)
Journal and publication information
Publication Type: Journal Article; Research Support, U.S. Gov't, P.H.S.
Journal: Human brain mapping (Hum Brain Mapp), published in United States. (Language: eng)
Reference: 2003-Jan; vol 18 (issue 1) : pp 22-9
Dates: Created 2002/11/27; Completed 2003/03/03; Revised 2007/11/14;
PMID: 12454909, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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