Brain, Vol 121, Issue 7 1357-1368, Copyright © 1998 by Oxford University Press
AC Nobre, T Allison and G McCarthy
The present study investigated the effect of visual selective attention
upon neural processing within functionally specialized regions of the human
extrastriate visual cortex. Field potentials were recorded directly from
the inferior surface of the temporal lobes in subjects with epilepsy. The
experimental task required subjects to focus attention on words from one of
two competing texts. Words were presented individually and foveally. Texts
were interleaved randomly and were distinguishable on the basis of word
colour. Focal field potentials were evoked by words in the posterior part
of the fusiform gyrus. Selective attention strongly modulated long-latency
potentials evoked by words. The attention effect co-localized with
word-related potentials in the posterior fusiform gyrus, and was
independent of stimulus colour. The results demonstrated that stimuli
receive differential processing within specialized regions of the
extrastriate cortex as a function of attention. The late onset of the
attention effect and its co-localization with letter string-related
potentials but not with colour-related potentials recorded from nearby
regions of the fusiform gyrus suggest that the attention effect is due to
top-down influences from downstream regions involved in word processing.
ARTICLES
Modulation of human extrastriate visual processing by selective attention to colours and words
West Haven Veterans Administration Medical Center and Department of Neurosurgery, Yale University Medical School, New Haven, USA. anna.nobre@psy.ox.ac.uk
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