donderdag 16 december 2010

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WBY-51JTYBV-1&_user=1394575&_coverDate=11%2F26%2F2010&_rdoc=13&_fmt=high&_orig=browse&_origin=browse&_zone=rslt_list_item&_srch=doc-info%28%23toc%236723%239999%23999999999%2399999%23FLA%23display%23Articles%29&_cdi=6723&_sort=d&_docanchor=&_ct=17&_acct=C000047079&_version=1&_urlVersion=0&_userid=1394575&md5=b75e7b854c3a1dff98adc629d19ee1e6&searchtype=a

ERP evidence of visualization at early stages of visual processing

Jonathan W. Pagea, Corresponding Author Contact Information, E-mail The
Corresponding Author, Paul Duhamelb and Michael A. Crognalec

a Department of Psychology, Minnesota State University, Mankato, MN, USA

b Department of Human Kinetics, Laurentian University, Sudbury, Ontario,
Canada

c Department of Psychology, University of Nevada, Reno, NV, USA
Accepted 1 November 2010.
Available online 26 November 2010.

Abstract

Recent neuroimaging research suggests that early visual processing
circuits are activated similarly during visualization and perception but
have not demonstrated that the cortical activity is similar in character.
We found functional equivalency in cortical activity by recording evoked
potentials while color and luminance patterns were viewed and while they
were visualized with the eyes closed. Cortical responses were found to be
different when imagining a color pattern vs. imagining a checkerboard
luminance pattern, but the same when imagining a color pattern (or
checkerboard pattern) vs. seeing the same pattern. This suggests that
early visual processing stages may play a dynamic role in internal image
generation, and further implies that visual imagery may modulate
perception.


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