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Nonconscious memory for motion activates MT+.

Preston P Thakral1, Scott D Slotnick

  • 1aCenter for Vital Longevity and School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, Texas bDepartment of Psychology, Boston College, Boston, Massachusetts, USA.

Neuroreport
|October 3, 2014
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Summary
This summary is machine-generated.

The extrastriate region MT+ activates during nonconscious memory for motion, challenging the assumption that this area only processes conscious motion. This study reveals MT+ involvement in unconscious visual perception.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • The extrastriate visual area MT+ is traditionally linked to conscious motion processing.
  • Previous research has not clarified MT+'s role in nonconscious motion memory.

Purpose of the Study:

  • To investigate if the MT+ region is activated during nonconscious memory for motion using functional MRI.
  • To determine the temporal relationship between nonconscious and conscious motion memory within MT+.

Main Methods:

  • Functional MRI (fMRI) was employed to monitor brain activity.
  • Participants viewed moving and stationary shapes during encoding and classified them during retrieval.
  • Activity in the MT+ region was analyzed for differences between moving and stationary stimuli, and between conscious and nonconscious processing.

Main Results:

  • MT+ activity was significantly higher for nonconscious processing of moving stimuli (moving-misses) compared to stationary stimuli (stationary-misses).
  • Nonconscious motion memory (moving-misses) exhibited an earlier temporal onset in MT+ than conscious motion memory (moving-hits).

Conclusions:

  • The findings demonstrate that MT+ is involved in nonconscious motion processing and memory.
  • Activity in MT+ and other visual-sensory areas should not automatically be equated with conscious perception.