Spontaneous alpha-band amplitude predicts subjective visibility but not discrimination accuracy during high-level perception. Conscious Cogn 2022 Jul;102:103337
Date
05/08/2022Pubmed ID
35525224Pubmed Central ID
PMC9631905DOI
10.1016/j.concog.2022.103337Scopus ID
2-s2.0-85129480592 (requires institutional sign-in at Scopus site) 10 CitationsAbstract
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.
Author List
Samaha J, LaRocque JJ, Postle BRAuthor
Joshua J. Larocque MD Assistant Professor in the Neurology department at Medical College of WisconsinMESH terms used to index this publication - Major topics in bold
Alpha RhythmBrain
Brain Mapping
Electroencephalography
Humans
Perception
Photic Stimulation
Visual Perception
