chapter  5
24 Pages

The Effects of Sources of "Noise" on Direct Observation Measures of Regression Periods: Case Studies of Four Infants' Adaptations to Special Parental Conditions

Horwich (1974) already concluded that "although the precise occurrence of regressive periods may be determined by individual genetic variations, it is obvious that species and subspecies genetic variation, gender, and environmental conditions have an effect on the emotional state of the individual and presumably also on these regressive periods" (p. 146).