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Abstract:
Abstract: We examined performance in a color-word Stroop task
requiring individuals to name the ink color of words describing
colored objects. On neutral trials, the word described an object
associated with a multiplicity of colors (e.g. car). On incongruent
trials, the color typically associated with the object was
incongruent with the ink color of the word (e.g., BANANA in blue
ink). Incongruent as compared to neutral trials activated anterior
portions of the inferior frontal gyrus commonly associated with
access and manipulation of semantic representations (BA45), as well
as the insula. We compared this pattern of activation to that
obtained in a prior study using an analogous color-object Stroop
task in which individuals named the ink color of colored objects
(e.g., a blue banana). In that study incongruent as compared to
neutral trials activated different regions within prefrontal cortex
as well as the dorsal portion of anterior cingulate cortex, the
superior parietal lobe and ventral extrastriate cortex associated
with the object processing regions. Hence, in this color-word
Stroop task, interference originated primarily at the semantic and
lexical regions of processing, whereas in the color-object Stroop
task it originated primarily in object-processing regions. This
dissociation indicates that Stroop interference can arise at
multiple levels in the nervous system depending on the nature of
the task-irrelevant attribute.
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