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Related Experiment Videos

Mental concentration and the pattern reversal visual evoked response.

W A Douthwaite1, H Connor

  • 1School of Optometry, Bradford University, United Kingdom.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|January 1, 1989
PubMed
Summary

Concentrating on a light emitting diode (LED) while viewing a visual evoked response (VER) stimulus reduced the VER wave amplitude by one-third. This suggests attention influences visual processing, impacting the VER signal strength.

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Psychophysics

Background:

  • The visually evoked response (VER) is a measure of visual pathway function.
  • Attention is known to modulate sensory processing, but its specific impact on VER amplitude requires further investigation.

Purpose of the Study:

  • To investigate the effect of focused attention on the amplitude of the pattern reversal visually evoked response (VER).

Main Methods:

  • VERs were recorded using a small check size stimulus presented to the left eye.
  • Subjects simultaneously viewed a light emitting diode (LED) with the right eye.
  • Participants were instructed to focus attention on either the VER stimulus or the LED.

Main Results:

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  • When subjects focused on the LED, the VER wave amplitude was attenuated.
  • The VER amplitude decreased to approximately two-thirds of the amplitude recorded when focusing on the VER stimulus.

    • Conclusions:

    • Focused attention significantly impacts the amplitude of the visually evoked response.
    • These findings highlight the role of attention in modulating early visual processing and signal transmission.