The effect of music volume on the frequency of vocalizations of institutionalized mentally retarded
Abstract: Twenty institutionalized severely mentally retarded individuals served as subjects in this study designed to observe the effects of no music, soft music (60 dB - 5 dB), and loud music (90 dB) on the frequency of vocalizations. A reversal design of ABACACAB was used with each observation period being 20 minutes. The stimulus music was instrumental jazz-rock. The data, when graphed, showed a decrease in the mean vocalization rate during the loud music condition and an increase in the mean vocalization rate during the soft music condition.
Keyword(s): music, intensity, vocalization, developmental-disabilities, frequency, institutionalized.