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The effect of spatial attention on memory scanning

I Marais1

  • 1University of Auckland.

Canadian Journal of Experimental Psychology = Revue Canadienne De Psychologie Experimentale
|July 9, 1998
PubMed
Summary

Spatial attention and visual quality affect early processing stages, not memory scanning. Faster reaction times (RT) were observed for attended and clear stimuli, indicating attention impacts visual encoding.

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Area of Science:

  • Cognitive Psychology
  • Experimental Psychology
  • Human Information Processing

Background:

  • Investigating the effects of spatial attention and stimulus quality on memory retrieval.
  • Understanding the stages of information processing in human memory.

Purpose of the Study:

  • To determine how spatial attention and visual stimulus quality influence different stages of memory processing.
  • To differentiate the effects of attention and visual quality on memory scanning versus early sensory stages.

Main Methods:

  • Utilized a Sternberg memory task with varying memory-set sizes (2, 4, 6 letters).
  • Manipulated spatial attention using central arrow cues.
  • Varied stimulus clarity (clear vs. visually degraded).
  • Measured overall reaction time (RT) to probe stimuli.

Main Results:

  • Reaction times (RT) were significantly shorter for attended locations compared to unattended locations.
  • RT was also significantly shorter for clear stimuli compared to degraded stimuli.
  • While attention reduced the intercept of the RT by memory-set size function, the slope remained unchanged, indicating no effect on the memory-scanning stage.
  • A significant interaction between visual quality and attention suggested they affect the same processing stage.

Conclusions:

  • Spatial attention appears to modulate early visual-encoding stages rather than the later memory-scanning stage.
  • Visual quality also influences early processing, interacting with attention at this presumed visual-encoding stage.
  • These findings provide insights into the serial or parallel nature of memory retrieval and the locus of attentional effects.

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