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Related Concept Videos

Association Areas of the Cortex01:21

Association Areas of the Cortex

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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,...
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Motor and Sensory Areas of the Cortex01:14

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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....
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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...
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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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Hearing01:31

Hearing

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When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
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Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Related Experiment Video

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Heterotopia or overlaying cortex: What about in-between?

Emilija Cvetkovska1,2, William Alves Martins1,3, Jorge Gonzalez-Martinez1,4

  • 1Epilepsy Center, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA.

Epilepsy & Behavior Case Reports
|November 21, 2018
PubMed
Summary

Periventricular nodular heterotopia (PNH) can cause drug-resistant epilepsy. Laser ablation of PNH and white matter "micronodules" successfully treated a patient, highlighting new epilepsy targets.

Keywords:
EpileptogenicityPeriventricular nodular heterotopiaStereo-EEG

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Area of Science:

  • Neuroscience
  • Epileptology
  • Neurosurgery

Background:

  • Periventricular nodular heterotopia (PNH) is a malformation of cortical development associated with epilepsy.
  • Drug-resistant epilepsy poses significant challenges in patient management.
  • Understanding the precise epileptogenic networks in PNH is crucial for effective treatment.

Observation:

  • A patient with unilateral PNH and intractable epilepsy underwent stereo-EEG (SEEG).
  • SEEG revealed seizure onset originating from the PNH, with rapid involvement of adjacent white matter "micronodules" and overlying cortex.
  • These findings suggest a complex epileptogenic network extending beyond the main heterotopic nodule.

Findings:

  • The study identified "micronodules" of heterotopic neurons in the white matter as potential contributors to epileptogenicity.
  • Laser ablation targeting both the PNH and these white matter micronodules was performed.
  • The patient became seizure-free following the minimally invasive surgical procedure.

Implications:

  • This case suggests that white matter "micronodules" associated with PNH can play a significant role in seizure generation.
  • Identifying and targeting these specific epileptogenic zones offers a novel therapeutic strategy.
  • Minimally invasive procedures targeting patient-specific epileptic networks in heterotopia show promise for seizure control.