Perception and Action


Learning Objectives

Know that attention can be deployed several ways.

Be able to define feature-based, location-based, and object-based attention.

Attention can be deployed several ways and is required for conjunction search tasks.

Not everything just jumps out at you.

  • Basic features, like color, orientation, direction of motion serve as natural segmentation cues.
  • More complex tasks, such as “find the T in with the L’s”, require attention.
  • The parietal cortex appears to be necessary for this.

Loads of psychophysical and electrophysiological experiments demonstrate three strategies:

  1. Feature-based attention: you can look for a particular feature anywhere.
    – Ex. Look for something that is black, metal, and has a diamond design.
  2. Spatial attention: you can look in a particular place for anything.
    – Ex. Look at the top right of the photo.
  3. Object-based attention: you can deploy attention along an object, even if it’s partially occluded.
    – Ex. Look at the street lamps on the bridge in the photo.
Fig.12.3.1. The figure above is an example of the FIT Theory; however, it serves as a good timeline of when pre-attentive and attentive vision are being used. (Credit: MrBazoun. Provided by: Wikimedia. License: CC-BY SA 3.0)
Cheryl Olman PSY 3031 Detailed Outline
Provided by: University of Minnesota
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Introduction to Sensation and Perception Copyright © 2022 by Students of PSY 3031 and Edited by Dr. Cheryl Olman is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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