Investigation of high-frequency transcranial random noise stimulation (hf-tRNS) mechanism on visual motion perception: a stochastic resonance approach

Ghin, Filippo and Pavan, Andrea and Mather, George (2017) Investigation of high-frequency transcranial random noise stimulation (hf-tRNS) mechanism on visual motion perception: a stochastic resonance approach. In: European Conference on Visual Perception, 27 - 31 August 2017, Berlin.

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Item Type:Conference or Workshop contribution (Poster)
Item Status:Live Archive

Abstract

High-frequency transcranial random noise stimulation (hf-tRNS) is a neuromodulatory technique consisting of the application of an alternating current at random frequencies usually ranging between 101 and 640 Hz.
Stochastic resonance is a nonlinear phenomenon whereby the addition of a random interference “noise” can enhance the detection or discrimination of a weak signal. An optimal amount of noise would result in performance enhancement, whereas further noise increments would impair the signal detection or discrimination.
hf-tRNS induces random activity in the system (i.e., hf-tRNS-induced noise) that may serve as a pedestal to boost the sensitivity of neurons to weak inputs, thus increasing the signal to noise ratio. On the contrary, either a lower or higher current intensity than the optimal level may produce no modulation or even impair the performance.
In this study observers (N=9) performed a two-interval forced choice (2IFC) motion direction discrimination task in which they had to report whether two moving patches presented in two intervals had the same or different motion directions.The aim of the study was to assess the effects of different hf-tRNS intensities (No-stimulation, 0.5, 0.75, 1.0, 1.5 and 2.25 mA) administered in separate sessions.
The results show a significant improvement in performance for 1mA (M=64.5% [SEM=1.73%]) and 1.5mA current (M=64.1% [SEM=1.18%]) with respect to the No-stimulation condition (M=60.3% [SEM=0.26%]) and a significant impairment of the performance for 2.25mA (M=56.8% [SEM=1.35%].
These results suggest that hf-tRNS-induced noise might modulate the signal to noise ratio in a way that is compatible with the stochastic resonance phenomenon.

Keywords:High frequency transcranial random noise stimulation (hf-tRNS), motion perception
Subjects:C Biological Sciences > C830 Experimental Psychology
B Subjects allied to Medicine > B140 Neuroscience
Divisions:College of Social Science > School of Psychology
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ID Code:29784
Deposited On:27 Nov 2017 16:06

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