Spontaneous alpha-band amplitude predicts subjective visibility but not discrimination accuracy during high-level perception.

Autor: Samaha J; Department of Psychology, University of California, Santa Cruz, USA. Electronic address: jsamaha@ucsc.edu., LaRocque JJ; Department of Neurology, New York University School of Medicine, USA., Postle BR; Department of Psychiatry, University of Wisconsin-Madison, USA; Department of Psychology, University of Wisconsin-Madison, USA.
Jazyk: angličtina
Zdroj: Consciousness and cognition [Conscious Cogn] 2022 Jul; Vol. 102, pp. 103337. Date of Electronic Publication: 2022 May 04.
DOI: 10.1016/j.concog.2022.103337
Abstrakt: Near-threshold perception is a paradigm case of awareness diverging from reality - the perception of an unchanging stimulus can vacillate from undetected to clearly perceived. The amplitude of low-frequency brain oscillations - particularly in the alpha-band (8-13 Hz) - has emerged as a reliable predictor of trial-to-trial variability in perceptual decisions based on simple, low-level stimuli. Here, we addressed the question of how spontaneous oscillatory amplitude impacts subjective and objective aspects of perception using high-level visual stimuli. Human observers completed a near-threshold face/house discrimination task with subjective visibility ratings while electroencephalograms (EEG) were recorded. Using single-trial multiple regression analysis, we found that spontaneous fluctuations in prestimulus alpha-band amplitude were negatively related to visibility judgments but did not predict trial-by-trial accuracy. These results extend previous findings that indicate that strong prestimulus alpha diminishes subjective perception without affecting the accuracy or sensitivity (d') of perceptual decisions into the domain of high-level perception.
(Copyright © 2022 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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