Elsevier

Neuroscience Letters

Volume 415, Issue 3, 30 March 2007, Pages 231-236
Neuroscience Letters

Effects of auditory noise on the psychophysical detection of visual signals: Cross-modal stochastic resonance

https://doi.org/10.1016/j.neulet.2007.01.030Get rights and content

Abstract

Harper [D.W. Harper, Signal detection analysis of effect of white noise intensity on sensitivity to visual flicker, Percept. Mot. Skills 48 (1979) 791–798] demonstrated that the visual flicker sensitivity was an inverted U-like function of the intensity of different levels of auditory noise from 50 to 90 dB (SPL), without concomitant changes in the response bias. The aim of the present study was to extend these observations in the context of the stochastic resonance, a counterintuitive phenomenon in which a particular level of noise enhances the response of a nonlinear system to a weak input signal. We show psychophysical evidence in a yes–no paradigm for the existence of a stochastic resonance-like phenomenon in the auditory–visual interactions. We show that the detection of a weak visual signal was an inverted U-like function of the intensity of different levels of auditory noise. Nevertheless, for a strong visual signal the auditory noise acts in detriment of the ability of visual detection. Our results suggest that auditory noise could be employed in vision rehabilitation interventions in order to improve the detection of weak visual signals.

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Acknowledgments

We thank Robert Simpson for proof reading the English manuscript. This work was partially supported by CONACyT J36062-N (E.M), PIFI-FOMES-BUAP and VIEP-BUAP I3/SAL/06-I (E.M), México and from MEC (Spain) and FEDER project CONOCE2 (FIS2004-00953). E.M is grateful for the hospitality and support of the Universitat de les Illes Balears. C.R.M is grateful for the hospitality and support of the BUAP. We thank A. López and P. Linares for technical assistance in some experiments.

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