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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"...
Prosopagnosia01:24

Prosopagnosia

Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...

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Related Experiment Video

Updated: Jun 18, 2026

Characterizing the Relationship Between Eye Movement Parameters and Cognitive Functions in Non-demented Parkinson's Disease Patients with Eye Tracking
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Memory-guided saccade processing in visual form agnosia (patient DF).

Stéphanie Rossit1, Larissa Szymanek, Stephen H Butler

  • 1Department of Psychology, University of Western Ontario, London, Canada.

Experimental Brain Research
|November 12, 2009
PubMed
Summary
This summary is machine-generated.

Patient DF, with visual form agnosia, showed impaired memory-guided saccades, challenging the dorsal stream

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Milner and Goodale's model posits ventral stream for perception/off-line actions and dorsal stream for on-line action control.
  • Patient DF exhibits visual form agnosia due to ventro-lateral occipital damage, sparing V1.
  • DF shows normal immediate reaching/grasping but impaired delayed actions, supporting the model.

Purpose of the Study:

  • To investigate if the dissociation between immediate and delayed actions extends to saccade execution in patient DF.
  • To examine the role of dorsal stream structures in memory-guided saccades.

Main Methods:

  • Assessed saccadic accuracy in patient DF under stimulus-guided and memory-guided conditions.
  • Compared DF's performance to established findings on posterior parietal cortex (PPC) involvement in memory-guided saccades.

Main Results:

  • DF's saccadic accuracy was significantly reduced in the memory-guided condition compared to the stimulus-guided condition.
  • This finding mirrors her deficits in delayed reaching and grasping.

Conclusions:

  • The data suggest a tight coupling between eye and hand movements.
  • Dorsal stream structures may not be sufficient for memory-guided saccadic performance, challenging existing models.