geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Detection of signals in modulated and unmodulated noise observed using auditory evoked potentials


, : Detection of signals in modulated and unmodulated noise observed using auditory evoked potentials. Clinical Neurophysiology 117(8): 1783-1793

Objective: To investigate a neurophysiological correlate of the perceptual enhancement of noise-masked sounds when the masking frequencies have a wide spectral bandwidth and are coherently amplitude-modulated.Methods: Auditory evoked potentials were recorded to 1 kHz tones (200 ms, 61dBSPL, SOA 3 s) occurring in silence or with 80 dB masking noise, which was either wide-band or narrow-band and either unmodulated or 100% amplitude-modulated by a 17.5 Hz square-wave. In a second study, the tones were timed to coincide alternately with the rise and fall of the masker envelope.Results: N1 and P2 potentials recorded to the unmasked tones were abolished in the presence of the unmodulated masker, but were elicited again with lower amplitude and longer latency when the masker was modulated. No significant effect of the masker bandwidth was observed. Latencies were strongly determined by whether the tones coincided with the rise or fall of the masker envelope, indicating that the responses were only evoked when the instantaneous noise level was low.Conclusions: The findings demonstrate partial correspondence to the threshold reduction to similar stimuli seen in comodulation masking release (CMR). The dependence of latencies on the phase of the masker envelope is consistent with the 'dip-listening' model of CMR.Significance: Under these conditions the N1/P2 complex can be viewed as a possible neurophysiological correlate of perceptual CMR. (c) 2006 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.

US$19.90

PMID: 16793334

DOI: 10.1016/j.clinph.2006.04.011


Other references

Pittet, D.; Francioli, P.; von Overbeck, J.; Raeber, P.A.; Ruef, C.; Widmer, A.F., 1995: Infection control in Switzerland. Infection control in hospitals is not mandatory in Switzerland as in the United States. There are more than 300 acute-care hospitals in Switzerland. Hospitals are reimbursed by patient-days rather than diagnosis-related group. However, all five Sw...

Maráz, A.; Geleta, A., 2001: Ethanol-induced cell aggregation (flocculation) and its physiological background in Schizosaccharomyces pombe rive 4-2-1. Cell aggregation (flocculation) of the yeast Schizosaccharomyces pombe strain RIVE 4-2-1 developed in glucose-containing medium, but only in the presence of ethanol. Cell surface proteins which participated in cell to cell interactions were charac...

Silberstein, J., 1955: Tuberculous immigrants in Israel. Tubercle 36(12): 382-386

Martin, F.W.; Telek, L.; Ruberte, R.M., 1974: Yellow pigments of Dioscorea bulbifera. Yellow pigments extracted from aerial tubers of D. bulbifera were mainly esters of xanthophylls and small quantities of the free xanthophylls also occurred. The principal xanthophylls tentatively identified were lutein, neoxanthin, violaxanthin, z...

Hesse, F.W.; Kauer, G.; Spies, K., 1997: Effects of emotion-related surface similarity in analogical problem solving. In analogical problem solving, a source problem with a known solution is used to solve a target problem. The present study deals with one possible condition influencing the search for possible source problems (i.e., with similarities between sourc...

Yang, L.; Liu, B.; Qin, C.; Hashimura, K.; Yamada, T.; Sumitomo, S.; Mori, M., 1994: Comparison of proliferating cell nuclear antigen index in benign and malignant salivary pleomorphic adenoma. The expression of proliferating cell nuclear antigen (PCNA) was studied in benign and malignant pleomorphic adenomas by using monoclonal antibody to PCNA. Carcinoma in pleomorphic adenoma (n = 8), cell-rich variant (n = 6) and typical pleomorphic...

Buchwald, D.; Cheney, P.R.; Peterson, D.L.; Henry, B.; Wormsley, S.B.; Geiger, A.; Ablashi, D.V.; Salahuddin, S.Z.; Saxinger, C.; Biddle, R., 1992: A chronic illness characterized by fatigue, neurologic and immunologic disorders, and active human herpesvirus type 6 infection. Objective: To conduct neurologic, immunologic, and virologic studies in patients with a chronic debilitating illness of acute onset. Design: Cohort study with comparison to matched, healthy control subjects. Patients: We studied 259 patients who s...

Travin, M.I.; Kamalakkannan, G., 2012: A key role for nuclear cardiac imaging in evaluating and managing patients with heart failure. Journal of Nuclear Cardiology 19(5): 879-882

Wegelin, 1927: Obituary, Hans Strasser. This Swiss anatomist was interested in the relationship of form and function and of mechanics of flight and movement. A bibliography of his writings is given.

Kamenski, G.; Braun, R.N.; Zoehrer, B., 2003: Small surgical interventions in general medicine. To cope with minor surgery in general practice is rewarding and should be done too. Since the figure of cutaneous pyogenic infections has dropped remarkably since World War II, the practitioners are not put under much pressure by these occurrences...