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Abstract:
When subjects judge whether two letters have the same (e.g.,
"p" and "p") or different (e.g., "p" and "P") specific shapes, they
perform more efficiently when the letters are presented directly to
the same hemisphere than to different hemispheres. Whereas, when
they judge whether letters belong to the same (e.g., "p" and "P")
or different (e.g., "p" and "S") abstract categories of shape, they
perform more efficiently when the letters are presented directly to
different hemispheres than to the same hemisphere. Dissociable
specific and abstract visual-form subsystems likely underlie the
two tasks, and hence specific visual-form information does not
cross brain commissures as effectively as abstract visual-form
information. We demonstrate this interaction effect with unfamiliar
(dot-in-grid) patterns as well and report concurrently developed
neural-network models that test computational reasons for the
asymmetric information transfer.
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