Previous studies of preferences of the profoundly mentally retarded have indicated that complex visual stimuli are more effective in eliciting responses than are auditory or simple stimuli. Male and female voices were used to determine preference for voice. Profoundly retarded adults (mean Social Quotient of 11.7) were first exposed to a situation where button pressing resulted in either a 250- or a 2000-Hz tone and then to a situation in which a male and female voice was associated with each button. Statistically significant differential preference was not exhibited to either type of stimulus although the female voice did appear more effective.
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