Abstract
In this experiment, cats were trained to escape from footshock in a shuttlebox. Current applied to the feet was varied in ascending and descending sequences for each animal according to the psychophysical method of limits, and each animal was trained until stable thresholds for escape responding were achieved. Animals then had bilateral lesions made in thalamic nuclei centrum medianum and centralis lateralis, were given 8 days to recuperate, and were retrained to a stable level of escape responding. The results showed that aversive thresholds were significantly elevated for all animals for up to 90 days following thalamic lesions, indicating that the midline thalamus plays a role in the perception of pain derived from footshock.
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