Electrophysiological Chronometry of Graded Consciousness during the Attentional Blink.

Visual awareness during the attentional blink can occur in a graded rather than an all-or-none pattern. In an event-related potential study with 32 participants, subjective visibility ratings of face targets on a perceptual awareness scale revealed graded differences in the N1, N2, and P3 brain components across visibility levels. A classification task preceding the ratings tracked task performance. The findings suggest that conscious perception during the attentional blink is not strictly all-or-none but can vary in degree, supporting graded theories of visual consciousness.

Study at a glance

Abstract

One of the ongoing debates about visual consciousness is whether it can be considered as an all-or-none or a graded phenomenon. While there is increasing evidence for the existence of graded states of conscious awareness based on paradigms such as visual masking, only little and mixed evidence is available for the attentional blink paradigm, specifically in regard to electrophysiological measures. Thereby, the all-or-none pattern reported in some attentional blink studies might have originated from specifics of the experimental design, suggesting the need to examine the generalizability of results. In the present event-related potential (ERP) study (N = 32), visual awareness of T2 face targets was assessed via subjective visibility ratings on a perceptual awareness scale in combination with ERPs time-locked to T2 onset (components P1, N1, N2, and P3). Furthermore, a classification task preceding visibility ratings allowed to track task performance. The behavioral results indicate a graded rather than an all-or-none pattern of visual awareness. Corresponding graded differences in the N1, N2, and P3 components were observed for the comparison of visibility levels. These findings suggest that conscious perception during the attentional blink can occur in a graded fashion.