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ABSTRACT Electrode arrays (8 × 8, 3.5 × 3.5 mm) were implanted epidurally on the olfactory bulbs of rabbits for EEG recording. The rabbits were trained to give a conditioned response to a warning odor paired with an electric shock. EEGs were recorded and edited, and representative ERG bursts with odor and preceding the odor were selected for measurement. Each burst was displayed in a contour map of amplitude. The contour maps revealed active EEG foci in the bulb with size, shape and location unique to each rabbit. Changes in shape and location took place only during familiarization and during training, when a warning odor was paired with the aversive stimulus. The EEG spatial patterns did not change when visual or auditory stimuli were used as CS. EEG spatial patterns did not reflect conformal mapping of odor stimulus to neural activity response, but were determined by state variables of the animal related to olfactory conditioning history. The implications for human EEG are briefly discussed.
Freeman et al. (Fri,) studied this question.
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