Top-down attention is limited within but not between feature dimensions

Nika Adamian (Corresponding Author), Elena Slaustaite, Søren K. Andersen (Corresponding Author)

Research output: Contribution to journalArticle

2 Citations (Scopus)
29 Downloads (Pure)

Abstract

In natural vision processing of spatial and non-spatial features occurs simultaneously, however, the two types of attention in charge of facilitating this processing have distinct mechanisms. Here we tested the independence of spatial and feature-based attention at different stages of visual processing by examining color-based attentional selection while spatial attention was focused or divided. Human observers attended to one or two of four fields of randomly moving dots presented in both left and right visual hemifields. In the focused attention condition the target stimulus was defined both by color and location, whereas in the divided attention condition stimuli of the target color had to be attended in both hemifields. Sustained attentional selection was measured by means of steady-state visual evoked potentials (SSVEPs) elicited by each of the frequency-tagged flickering dot fields. Additionally, target and distractor selection was assessed with event-related potentials (ERPs) to these stimuli. We found that spatial and color-based attention independently modulated the amplitude of SSVEPs, confirming independent top-down influences on early visual areas. In contrast, P3 amplitudes elicited only by targets and distractors of the attended color were subject to space-based enhancement, suggesting increasing integration of spatial and feature-based selection over the course of perceptual processing.
Original languageEnglish
Pages (from-to)1173-1183
Number of pages11
JournalJournal of Cognitive Neuroscience
Volume31
Issue number8
Early online date22 Feb 2019
DOIs
Publication statusPublished - 1 Aug 2019

Keywords

  • SELECTIVE ATTENTION
  • VISUAL-ATTENTION
  • TIME-COURSE
  • NEURAL MECHANISMS
  • RECEPTIVE-FIELD
  • CUED SHIFTS
  • COLOR
  • MODULATION
  • FACILITATION
  • LOCATION

ASJC Scopus subject areas

  • Cognitive Neuroscience

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