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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

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Related Experiment Video

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Injections of AAV Vectors for Optogenetics in Anesthetized and Awake Behaving Non-Human Primate Brain
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Visual vector inversion during memory antisaccades--a TMS study.

Thomas Nyffeler1, Mathias Hartmann, Christian W Hess

  • 1Perception and Eye Movement Laboratory, Department of Neurology, Bern University Hospital, Bern, Switzerland. thomas.nyffeler@insel.ch

Progress in Brain Research
|August 23, 2008
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Summary

The posterior parietal cortex (PPC) is crucial for visual vector inversion in memory antisaccade tasks. Transcranial magnetic stimulation (TMS) revealed distinct temporal roles for the PPC in this process.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Oculomotor Research

Background:

  • The memory antisaccade task requires inverting visual spatial information.
  • The posterior parietal cortex (PPC) is implicated in visual vector inversion.
  • Understanding the temporal dynamics of PPC involvement is key.

Purpose of the Study:

  • To investigate the temporal dynamics of visual vector inversion in the human PPC.
  • To determine the precise timing of PPC involvement during the memory antisaccade task.
  • To explore the role of the PPC in processing spatial information for accurate eye movements.

Main Methods:

  • Utilized transcranial magnetic stimulation (TMS) on six healthy subjects.
  • Applied single-pulse TMS over the right PPC at specific time intervals (100, 217, 333, 450 ms) after target onset.
  • Measured the effect of TMS on saccade gain during a memory antisaccade task.

Main Results:

  • TMS at 100 ms disrupted rightward antisaccades (left target presentation).
  • TMS at 333 ms and 450 ms disrupted leftward antisaccades (right target presentation).
  • This dissociation indicates distinct temporal roles for the PPC in visual vector inversion.

Conclusions:

  • The PPC's role in visual vector inversion unfolds over time.
  • Early TMS (100 ms) interfered with initial inversion, while later TMS (333, 450 ms) affected motor planning based on inverted signals.
  • Findings highlight the temporal specificity of PPC function in spatial cognition and motor control.