1. Changes in perceptual function after isolation.
2. Held R. Exposure as a factor in maintaining stability of perception and coordination. J. nerv. ment. Dis., in press.
3. Held R., Bossom J. Neonatal deprivation and adult rearrangement: Complementary techniques for analyzing plastic sensory-motor coordinations. J. comp. physiol. Psychol., in press.