“…Experimental-setting effects have been reported in the interactions of families with adolescents (O'Rourke, 1963), emotionally disturbed preschoolers (Moustakas, Sigel, & Schalock, 1956), and infants (Brookhart & Hock, 1976;Ross, Kagan, Zelazo, & Kotelchuck, 1975). Moreover, Schlieper (1975) found few social-class differences in mother-child interactions observed at home and concluded that the laboratory setting itself, in which much of the prior research had been conducted, might have been responsible for previously observed social-class differences. Since lowerclass families might be more anxious in the laboratory, observed social-class differences might reflect differences in anxiety level rather than in social class.…”