“…Using this procedure, Birch and Belmont (1965b) found improvement in accuracy and decreased variability with increasing age in normal children between the ages of 5 and 11. In other studies, the same or similar procedures revealed deficiency (relative to control groups) of intersensory function in retarded readers (Birch & Belmont, 1964, 196Sb;Muehl & Kremenak, 1966), braindamaged persons (Aten & Davis, 1968;Birch & I. Belmont, 1964;Birch & L. Belmont, 196Sa), psychiatrically disturbed adolescents (Hertzig & Birch, 1966, malnourished children (Cravioto, Gaona, & Birch, 1967), and schizophrenic children (Walker & Birch, 1970).…”