Two studies were performed to determine the necessity of reafference (stimulation due to self-induced movement) in the production of adaptation to prismatic displacement. In Exp. I, 48 Ss exposed to laterally-displacing prisms, were equally divided into four groups comprising combinations of each of the two following variables: self-induced versus passive movement, and self-directed versus externally-directed motion. These groups were non-differential in the magnitude of positive adaptation, although the total population adapted positively and significantly to the prisms. In Exp. II, 17 Ss were tested before and after exposure to the same prisms in a situation which provided informational feedback regarding error and which eliminated self-produced movement. The group demonstrated significant positive adaptation. It is concluded that reafference is not necessary for adaptation and that informational feedback is, at least, sufficient and may be necessary for adaptation.

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Visual evoked cortical responses (VECRs) were recorded from the left (O1) and right (02) hemispheres at varying interstimulus intervals (ISIs) in children who were either: Normal (dextral), Dextral Retardates, or Sinistral Retardates. Latencies of N1 and P2 components of the VECR were stable and similar for both hemispheres in all groups. There was an asymmetry between the hemispheres for N1-P2 amplitude: right greater than left in Normals; this direction of asymmetry was also present in Sinistral Retardates, but was reversed in Dextral Retardates. The direction of normal VECR asymmetry was the reverse of that previously established for the auditory evoked cortical response (AECR) amplitude (Richlin, et al., 1973; Matsumiya, et al., 1972; Morrell & Salamy, 1971; Wood, et al., 1971). It is suggested that some neural mechanism of the retardates may allow excessive non-verbal stimulation of the normally "verbal" hemisphere. The electrical activity of the brain consequent to auditory or visual stimulation appears to depend upon: the modality of stimulation, the mental status of the individual, and his handedness. These factors have led to the establishment of an additional index to provide differential diagnosis of the mental status of the child.

This 1199-item bibliography is concerned with the general topics of sensory and perceptual deprivation, isolation, relative restriction of sensory input, brain-washing, life in isolated outposts, submarines, etc.