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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

The cerebral cortex, the brain's outermost layer, is pivotal in processing complex cognitive tasks, emotions, and various sensory inputs and executing voluntary motor activities. This intricate structure is divided into three primary functional areas: the motor areas, sensory areas, and association areas.
Motor Areas
The motor areas located in the frontal lobe are central to controlling voluntary movements. This region is further subdivided into the primary motor cortex and the premotor cortex.
Association Areas of the Cortex01:21

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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,...
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"...
Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
Somatosensory, Motor, and Association Cortex01:23

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at the...

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Reading without the left ventral occipito-temporal cortex.

Mohamed L Seghier1, Nicholas H Neufeld, Peter Zeidman

  • 1Wellcome Trust Centre for Neuroimaging, Institute of Neurology, UCL, London WC1N 3BG, UK. m.seghier@fil.ion.ucl.ac.uk

Neuropsychologia
|September 29, 2012
PubMed
Summary
This summary is machine-generated.

Skilled reading can utilize a left hemisphere pathway involving the superior temporal sulcus (STS) that bypasses the left ventral occipito-temporal cortex (LvOT). This alternative route is more active when the LvOT pathway is less connected, aiding reading in some individuals.

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psycholinguistics

Background:

  • The left ventral occipito-temporal cortex (LvOT) is traditionally considered crucial for rapid, parallel letter processing in skilled reading.
  • Investigating alternative neural pathways for reading is essential to understand brain plasticity and reading recovery.

Purpose of the Study:

  • To determine if skilled reading can be supported by neural pathways independent of the LvOT.
  • To explore the functional connectivity of a potential alternative reading pathway in the left hemisphere.

Main Methods:

  • Case study of a stroke patient with pure alexia and LvOT damage.
  • Functional magnetic resonance imaging (fMRI) and dynamic causal modeling (DCM) were employed.
  • Analysis of 29 skilled readers to assess inter-subject variability in neural pathway engagement.

Main Results:

  • A stroke patient with LvOT damage demonstrated a reading pathway connecting occipital cortex to left motor/premotor regions via the superior temporal sulcus (STS) for short words.
  • This STS-mediated pathway was inversely correlated with LvOT pathway connectivity in skilled readers.
  • Individuals with weaker LvOT connectivity showed stronger engagement of the STS pathway.

Conclusions:

  • A distinct left hemisphere reading pathway, involving the STS, supports rapid identification of short familiar words, particularly when LvOT is compromised.
  • This alternative pathway's engagement varies among skilled readers, suggesting neural plasticity in reading.
  • The findings highlight the importance of the STS pathway for reading, especially in cases of LvOT damage.