Contralateral proximal interference

Reeves, Adam and Seluakumaran, Kumar and Scharf, Bertram (2021) Contralateral proximal interference. Journal of the Acoustical Society of America, 149 (5). pp. 3352-3365. ISSN 0001-4966, DOI

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A contralateral ``cue'' tone presented in continuous broadband noise both lowers the threshold of a signal tone by guiding attention to it and raises its threshold by interference. Here, signal tones were fixed in duration (40 ms, 52 ms with ramps), frequency (1500 Hz), timing, and level, so attention did not need guidance. Interference by contralateral cues was studied in relation to cue-signal proximity, cue-signal temporal overlap, and cue-signal order (cue after: backward interference, BI; or cue first: forward interference, FI). Cues, also ramped, were 12 dB above the signal level. Long cues (300 or 600 ms) raised thresholds by 5.3 dB when the signal and cue overlapped and by 5.1 dB in FI and 3.2 dB in BI when cues and signals were separated by 40 ms. Short cues (40 ms) raised thresholds by 4.5 dB in FI and 4.0 dB in BI for separations of 7 to 40 ms, but by similar to 13 dB when simultaneous and in phase. FI and BI are comparable in magnitude and hardly increase when the signal is close in time to abrupt cue transients. These results do not support the notion that masking of the signal is due to the contralateral cue onset/offset transient response. Instead, sluggish attention or temporal integration may explain contralateral proximal interference.

Item Type: Article
Funders: United States Department of Defense Air Force Office of Scientific Research (AFOSR) [FA9550-04-1-0244]
Uncontrolled Keywords: Contralateral proximal interference; Contralateral cues; Broadband noise
Subjects: H Social Sciences > HV Social pathology. Social and public welfare
R Medicine > RB Pathology
Divisions: Faculty of Medicine
Depositing User: Ms Zaharah Ramly
Date Deposited: 05 Apr 2022 08:05
Last Modified: 05 Apr 2022 08:05

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