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Sensory Restriction and Recovery of Function

Source: 1978;:331-366.
Author: Layton BS, Corrick GE, Toga AW

Abstract:
Changes in brain function having detrimental behavioral consequences may be produced by factors other than those associated with trauma. In this chapter we consider recent evidence which indicates that isolation from normal sensory expereince is one of these factors. Our goal is to outline some of the conditions of visual deprivation which may result in physiological and behavioral aberrations and to discuss several hypotheses concerning the mechanisms of these effects. Additionally, and in substantially greater detail, we review investigations of recovery of function following deprivation. The deprivation literature is vast and rapidly growing, and this chapter is in no way intended to represent a complete review of the field. We restrict our discussion to studies concerning changes in cortical physiology and behavior following visual deprivation in the cat as they are relevant to recovery of function. With this goal in mind the chapter is divided into 2 broad sections. The first is more general and describes some of the immediate effects of deprivation on cortical physiology and behavior. The major interpretive problems in this field are discussed as are some of the experimental strategies that have been developed to resolve them. The second section is concerned with functional recovery following deprivation and is organized independently of the first part in order to facilitate a finer level analysis of a more restricted subject matter. This chapter is primarily intended as an examination of the evidence concerned with determining the degree of functional restitution that occurs under various conditions following isolation from the normal visual environment. But the material discussed also furnishes insight into the various phenomena of functional recovery which occur following traumatic brain damage. Regarding the general problems of recovery from the tanget of visual deprivation provides a surprisingly rich perspective, and, although we do not have the space to exploit this potential fully, the reader who is familar with the recovery literature will quickly appreciate it.