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Controlled processes in human consciousness represent high-alert mental states where individuals deliberately focus their attention on achieving specific goals. Controlled processes can be seen in situations like mastering new technology, where a person might become so absorbed that they ignore surrounding distractions. Such processes involve selective attention, requiring one to concentrate on particular elements of experience while disregarding others. These are governed by executive...

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Attentional limits and freedom in visually guided action.

James T Enns1, Geniva Liu

  • 1Department of Psychology, University of British Columbia, Vancouver, BC, Canada. jenns@psych.ubc.ca

Progress in Brain Research
|September 8, 2009
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Summary

Human vision has two streams: conscious perception and unconscious action control. Unconscious visual processing guides actions, but can be overloaded, impacting multitasking abilities.

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Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Motor Control

Background:

  • Human vision serves both conscious object recognition and visually guided action.
  • Visual attention research has largely focused on conscious perception, neglecting unconscious action control.
  • The functional distinction between perception and action in vision is supported by various scientific disciplines.

Purpose of the Study:

  • To investigate the attentional limits of visual processing for action control.
  • To explore the interplay between conscious perception and unconscious motor guidance.
  • To determine conditions for successful multitasking in visual perception and action.

Main Methods:

  • Review of laboratory research integrating psychophysics and kinematics.
  • Analysis of interference effects between concurrent perception and action tasks.
  • Examination of attentional capacity limits in unconscious visual guidance.

Main Results:

  • Visually guided finger movements are controlled by an "automatic pilot" using distinct information from conscious vision.
  • Conscious object identification hinders planning of subsequent actions but not online motor control.
  • Concurrent perception and action can sometimes enhance motor performance.
  • The automatic pilot has limited capacity for processing information from multiple locations simultaneously.

Conclusions:

  • Unconscious visual processing for action operates independently but has its own capacity limits.
  • Multitasking interference arises from competition for attentional resources, particularly during action planning.
  • Understanding these limits is crucial for defining the boundaries of interference-free visual multitasking.