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Abstract:
In two experiments hemisphere-specific interference is
examined under conditions in which subjects maximally alternate
brow and cheek responses. In the first experiment, subjects
alternated ipsilateral brow and cheek responses (e.g., right-brow
with right-cheek) and contralateral brow responses (e.g.,
right-brow with left-cheek). In the second experiment, subjects
alternated dual bilateral brow/cheek responses
(right-brow/left-cheek with left-brow/right-cheek) and dual
ipsilateral brow/cheek responses (right-brow/right-cheek with
left-brow/left-cheek). The pattern of results from both experiments
indicated that when subjects control the next response with the
hemisphere responsible for controlling the current response,
performance is degraded, relative to when subjects control the next
response with the hemisphere not responsible for controlling the
current response. It is concluded that when different speeded face
responses are controlled within hemisphere, it may require
intermittent competition for shared hemisphere-specific mechanisms,
causing an information processing ãbottleneckä in face
control.
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