Abstract
Seven rhesus macaque monkeys were trained to discriminate proprioception, vibration, light touch, and two-point discrimination. They then underwent removal of the classical somatosensory lemniscal cortex, areas SI and SII. There was complete loss of proprioceptive and two-point discriminatory ability immediately following surgery, with minimal loss of vibratory discrimination and light touch sensitivity. Following extensive retraining, the animals regained all fine discriminatory ability except for a slight increase of proprioception and two-point discrimination thresholds.
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