| |
Abstract:
Earlier, we demonstrated that maximally alternating
ipsilateral brow and cheek responses produced slower and more
variable responses than contralateral responding. The ipsilateral
condition produced a situation where a single hemisphere
intermittently controlled the speeded brow and cheek responses,
thus producing greater potential for hemispheric interference. We
also demonstrated that maximally alternating bilateral brow/cheek
dual-responses produced slower and more variable dual-responses
than alternating ipsilateral dual-responses. The bilateral
condition produced a situation where both hemispheres
intermittently controlled the speeded brow/cheek dual-responses,
thereby increasing the potential for interference within each
hemisphere. The purpose of the following experiments is to
re-examine hemispheric interference with a psychological refractory
period paradigm. In three experiments visual stimuli were mapped to
brow and cheek responses. In Experiment 1, a two-choice brow
reaction time (RT) was followed by a two-choice cheek RT. In
Experiment, 2 a two-choice cheek RT was followed by a two-choice
brow RT. In Experiment, 3 a four-choice ipsilateral or bilateral
dual-brow/cheek RT was followed by the remaining like ipsilateral
or bilateral condition. In all experiments, the second RT increased
as stimulus onset asynchrony decreased and when consecutive
responses were controlled within hemisphere. Hence, these data are
consistent with an intrahemispheric interference
explanation.
|
