Our findings with regard to the role of sound in the search behavior of Robbie are representative of findings in the study of four infants blind from birth. In Robbie's case we regard the following points as significant for further study of ego formation in the child who is totally blind from birth.

1In the absence of vision the coordination of prehension and hearing appears as a late achievement in the last quarter of the first year. In the sighted child visual search for the source of sound is demonstrated under two months of age. The sighted child makes a purposeful reach for an object "on sight" between five and six months of age. There are no equivalents in a blind baby's behavior toward a sound object. Orientation to the source of sound did not appear in Robbie's case until seven months. Intentional reach on sound cue alone did not appear until eleven months of age.