Abstract
The aim of this study was to examine the cortex during the logical processing of auditory information using a whole-cortex type dc-SQUID gradiometer. The task modified the normal auditory oddball paradigm to require the processing of simple logic before counting a rare stimulus mentally. Although the latency of P300 m did not change, a dipolar magnetic field pattern was observed over the left cerebral hemisphere at approximately 280 ms poststimulus before forming the field pattern of P300 m. The equivalent current dipole source was estimated to be medial to the N100 m source. It was suggested that the additional load of logic processing may activate Heschl's gyri in the left hemisphere.
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