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Abstract:
Both EEG and skin conductance were measured while subjects
passively viewed movies with no sound. During the movie both
electrical and auditory stimuli were delivered. Electrical shocks
were delivered to the median nerve at the wrist with the voltage
adjusted to obtain a visible twitch of the abductor pollicus brevis
muscle. Novel sounds were delivered to the ears via headphones.
Stimuli were presented in a pseudo-random order during four 20
minute blocks. Skin conductance responses (SCR) were obtained with
Ag-AgCl electrodes placed on the palmar and dorsal surfaces of the
hand. Evoked potential responses (ERP) were recorded from three
midline locations (Fz, Cz, and Pz). The scalp topography of the
responses varied between the two stimulus modalities. Habituation
of SCR as well as early and late ERP responses were seen within as
well as between blocks. P3 and N1 components appear to be
differentially involved with the generation of the peripheral
orienting response depending on the modality of the
stimulus.
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