Effects of acoustical stimulation on human equilibrium were measured on a rail test developed by Graybiel and Fregly [Acta Otolaryngol. 61, 292–312 (1966)]. Two tasks were used—standing with eyes open on rails 114in. and 34in. wide and standing with eyes closed on rails 134in. and 114in. wide. Five noise conditions were used—bilateral and unilateral presentations of impact (135 dB) and continuous (110 dB), and a bilateral control (75 dB). Analyses revealed no significant effects of types of noise on rail performance. These findings appear somewhat at variance with earlier results [H. C. Sommer and C.S. Harris, Aerospace Med. Res. Lab. Rep. 70-26, Wright-Patterson AFB, Ohio (1970); C.W. Nixon, C.S. Harris, and H. E. von Gierke, Aerospace Med. Res. Lab. Rep. TR-66-85, Wright-Patterson AFB, Ohio (1966)] indicating that asymmetrical, free-field noise stimulation produced significant impairment on a similar test, but their asymmetrical conditions involved unequal protection of the ears, resulting in a much greater interaural intensity difference.
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