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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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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...
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Working Memory01:24

Working Memory

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Working memory refers to a combination of components, including short-term memory and attention, that allow an individual to hold information temporarily as we perform cognitive tasks. It is an essential cognitive function that enables the execution of complex tasks such as problem-solving, comprehension, and reasoning. Unlike short-term memory, which simply involves the storage of information for a brief period, working memory involves the active manipulation and processing of this...
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Role of Cerebellum and Prefrontal Cortex in Memory01:14

Role of Cerebellum and Prefrontal Cortex in Memory

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The cerebellum, while traditionally associated with motor control, also plays a crucial role in memory, particularly in procedural memory, which involves learning motor tasks that become automatic through repetition. For example, studies have shown that when the cerebellum is damaged, individuals or animals lose the ability to learn conditioned motor responses, such as the conditioned eye-blink response in classical conditioning experiments with rabbits. This study demonstrates the...
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Consequence of stroke for feature recall and binding in visual working memory.

Selma Lugtmeijer1, Sebastian Schneegans2, Nikki A Lammers3

  • 1University of Amsterdam, Amsterdam, the Netherlands; Radboud University, Donders Institute for Brain, Cognition and Behaviour, Nijmegen, the Netherlands.

Neurobiology of Learning and Memory
|January 18, 2021
PubMed
Summary

This study reveals that visual working memory deficits in stroke patients are subtle and linked to specific brain regions. Feature binding and memory precision impairments correlate with distinct lesion locations, particularly in the somatosensory and fronto-parietal cortices.

Keywords:
BindingComputational modelingLesion-symptom mappingStrokeVisual working memory

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Visual Perception

Background:

  • Visual memory relies on integrating object features into unified representations.
  • Understanding the neural basis of feature binding in visual working memory is crucial.

Purpose of the Study:

  • To investigate feature binding and visual working memory precision in stroke patients.
  • To identify specific brain regions associated with visual memory deficits using lesion analysis.

Main Methods:

  • Employed a delayed-reproduction task with spatial arrays of colored disks.
  • Combined computational modeling and atlas-based lesion-symptom mapping in stroke patients and controls.

Main Results:

  • Controls showed a single source of variability for report imprecision and swap errors.
  • Stroke patients exhibited reduced memory precision for color and location.
  • Deficits in item reporting, rather than selection, were prominent in patients.
  • Specific lesion locations correlated with binding deficits (left somatosensory cortex) and color reporting precision (bilateral fronto-parietal regions).

Conclusions:

  • Visual working memory representations are widely distributed across cortical regions.
  • Stroke patients often show subtle visual working memory impairments, possibly due to neural compensation.
  • Distinct brain areas are involved in different aspects of visual memory, including feature binding and precision.