Event related potentials reveal that increasing perceptual load leads to increased responses for target stimuli and decreased responses for irrelevant stimuli

Chris Rorden, Chiara Guerrini, Rachel Swainson, Marco Lazzeri, Gordon C. Baylis

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Abstract

Lavie (1995) have suggested that perceptual processing is infl uenced by perceptual load. Specifi cally, relevant information receives additional processing in high load situations exhausting the available capacity. On the other hand, irrelevant information receives less processing with increasing load on a relevant task, as there is a reduced amount of residual processing available. Rees et al. (1997) provided the fi rst physiological evidence for this model, showing this pattern in a functional magnetic resonance imaging study. Likewise, Handy et al. (2001) offered supporting evidence measuring event related potentials (ERPs). Both of these studies presented irrelevant information in peripheral vision. Here we manipulated load while using the identical stimuli and the same task (a peripheral gap judgment task) with centrally presented irrelevant stimuli. ERPs show the pattern predicted by Lavie and colleagues, specifi cally for the N1 component. This work offers further evidence that visual attention modulates relatively early processing of perceptual information. Specifi cally, increasing load resulted in stronger N1 responses to relevant information and weaker N1 responses to irrelevant information.

Original languageEnglish
Article number4
JournalFrontiers in Human Neuroscience
Volume2
DOIs
Publication statusPublished - 22 May 2008

Keywords

  • human
  • perception
  • spatial attention
  • perceptual load
  • selective attention
  • visual-attention
  • extrastriate
  • distractors
  • mechanism
  • color

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