a loss of structure or operation of a portion of the thalamus resulting in such impacts as avoidance-learning deficits. Animals which have experienced a thalamic lesion take a great deal longer to learn to prevent or avoid an electric shock, even though they learn at some point. Impacts vary somewhat depending upon the portion of the thalamus that has been impacted.

THALAMIC LESION: "The thalamic lesion will take time to heal."