INTRINSIC NOISE REGULATES EXTRINSIC NOISE-INDUCED SENSITISATION OF VISUAL PERCEPTION

  • Takatsugu Aihara
  • Keiichi Kitajo
  • Daichi Nozaki
  • Yoshiharu Yamamoto

Abstract

We provide the first experimental evidence that the intrinsic noise level determines whether extrinsic noise can enhance the detectability of a weak input signal. We conduct a visual detection experiment in the absence and presence of various amounts of random visual noise. We define two indices of extrinsic stochastic resonance effects, consider the spread of the psychometric function without extrinsic noise as an intrinsic noise level index, and find that the indices of extrinsic stochastic resonance effects are negatively correlated with the intrinsic noise index. Our results suggest that extrinsic noise-induced sensitisation depends not only on the extrinsic but also on the intrinsic noise level.
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