Effect of noise on the contrast detection threshold in visual perception

How does stochastic resonance work within the human brain? – Psychophysics of internal and external noise

“…Sometimes, effects of SR caused by external noise (i.e., external SR) are small in neuroscientific studies (though significant); for example, the effects were about 4% for noise enhancement of hearing [35] and about 2 dB decrement in contrast threshold in visual perception [52]. Because the external SR effects shown in these studies were averaged across subjects, such small effects may indicate that not all of the subjects showed external SR.…”

“…Based on previous findings [36,52,54], we consider that the effect of noise can be incorporated into the two parameters a and b of the psychometric function (Eq. (1)).…”

Role of noise in human visual perception: A psychophysical study

“…These results open up possibilities for potential application of noise in practical applications for enhancing visual perception, which can be useful as an aid for the treatment for visual impairment and for the detection of a weak signal embedded in a noisy background [15,25]. Further investigation in this direction is essential to fully exploit the beneficial role of noise in visual perception.…”

“…Increase in the detect ability of weak signals by the process of stochastic resonance (SR) has been observed, for example, in the crayfish [5], cricket [6] and rats [7]. For complex cognitive systems, SR has been observed in human brain waves [8], ambiguous pattern detection [9], human tactile sensation [10,11] and also in human visual perception [12][13][14][15]. Some studies [16][17] point out the possible utility of SR and suggest that it have might offered some survival benefits, which worked in favor of SR in the biological systems.…”

Noise Effect on LV Image Segmentation

“…These assumptions are application dependent due to nonlinearity of the magnitude reconstruction process to obtain real images [1]. In MRI, there is an intrinsic trade-off between the signal-tonoise ratio (SNR) and resolution.…”