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T J Ayres

Publications and source records attributed to T J Ayres.

5 recordsLinked to original sources
PubMed1986

Visual acuity with noise and music at 107 dbA.

In Exper. I, 10 normal-hearing college students performed visual acuity, visual search, and pursuit tracking tasks during music presented at 70 or 107 dbA. Only visual acuity was significantly worse during the higher sound level, which suggest that the effect existed at the relatively low level of sensory processing rather than at the level(s) of cognition and decision-making. In Exper. II, 28 similar Ss performed the visual acuity task during either music or noise presented at 70 or 107 dbA. Acuity was impaired by loud music but not by loud noise. It was suggested that the momentary peak levels in music may play a role in disrupting vestibulo-ocular control, and that some workplace noises may partake of this acoustic characteristic.

Adolescent↗
PubMed1984

Detection of interaural phase shift between a subaudible and an audible tone.

Can a shift in interaural phase between a subthreshold signal and an audible contralateral probe tone affect perception of the probe? To obtain an answer, an 800-Hz tone was presented to both ears. The tone was presented continuously to one ear (-25 to + 10 dB SL) and in a sequence of four bursts per trial to the other ear (+ 10 dB SL). Interaural phase was reversed for either the second or the fourth burst in a 2 AFC task. Interaural phase-shift detection threshold (65% correct) varied with the intensity of the continuous signal; across subjects, this threshold varied from -21 to + 1 dB SL. When a 300-or 500-Hz masking tone was added to the ear with the continuous signal, phase-shift detection accuracy depended primarily upon the sensation level of the signal rather than its sound pressure level. These findings demonstrate temporal encoding at signal levels well below hearing threshold.

Adolescent↗
PubMed1984

Interaural octave phase-shift detection and aural harmonic distortion.

A continuous 400-Hz tone (60-75 dB SPL) and 250-msec bursts of an 800-Hz tone (10 dB SL) were delivered dichotically. Four out of nine listeners were able to detect a 180 degree interaural phase shift. When a subaudible continuous 800-Hz tone was added to the ear with the 400-Hz tone, interaural phase-shift detection depended on the phase relation of the added tone to the 400-Hz tone. These results are shown to be consistent with the hypothesis of aural harmonic distortion.

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