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Related Concept Videos

Motor and Sensory Areas of the Cortex01:14

Motor and Sensory Areas of the Cortex

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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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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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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,...
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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
Once through the pupil, the light passes through the lens, a...
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Related Experiment Video

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Visualization of Cortical Modules in Flattened Mammalian Cortices
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Functional Connectivity Patterns of Visual Cortex Reflect its Anatomical Organization.

Erhan Genç1,2,3,4, Marieke Louise Schölvinck5, Johanna Bergmann2,3,6

  • 1Biopsychology, Faculty of Psychology, Ruhr University Bochum, Bochum 44780, Germany.

Cerebral Cortex (New York, N.Y. : 1991)
|August 14, 2015
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Summary

Resting-state brain activity in the visual cortex shows specific patterns. These patterns closely mirror the brain's anatomical layout, especially in how visual fields are mapped and organized hierarchically.

Keywords:
correlationsfMRIresting-state connectivityvisual cortex

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Functional Neuroimaging

Background:

  • The brain exhibits continuous resting-state activity, even without external stimuli.
  • The precise relationship between resting-state activity patterns and the brain's anatomical and functional organization remains incompletely understood.
  • Investigating these patterns in the human visual cortex can elucidate fundamental principles of brain organization.

Purpose of the Study:

  • To investigate how resting-state functional magnetic resonance imaging (fMRI) activity patterns in the human visual cortex correspond to its anatomical and functional architecture.
  • To examine correlations between visual cortical areas along the visual hierarchy, their dorsal/ventral segments, and foveal/peripheral representations.

Main Methods:

  • Utilized fMRI in 44 human subjects to map visual field representations in visual cortical areas.
  • Analyzed resting-state functional connectivity (correlations) between these visual areas.
  • Compared connectivity patterns across different levels of the visual hierarchy and between homologous interhemispheric regions.

Main Results:

  • Strong resting-state correlations were observed between retinotopically corresponding regions, particularly for peripheral visual field representations.
  • Primary visual cortex (V1) showed high internal correlations and the strongest connectivity with the lateral geniculate nucleus (LGN).
  • Areas V2 and V3 exhibited weaker LGN connectivity but stronger inter-area connections with higher visual areas (V4, hMT+).
  • Interhemispheric correlations between homologous visual areas were notably robust.
  • These correlation patterns remained stable over time and were minimally affected by task conditions.

Conclusions:

  • Resting-state fMRI activity in the human visual cortex accurately reflects its anatomical organization, including retinotopy and hierarchical structure.
  • The findings suggest that resting-state connectivity provides a reliable index of the visual system's intrinsic organization.
  • The robust nature of these patterns underscores their fundamental role in visual processing, even in the absence of explicit tasks.