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Related Concept Videos

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Vision01:24

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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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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.
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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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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:
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Visual System01:26

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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.
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Stimulus-specific Cortical Visual Evoked Potential Morphological Patterns
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Haptic shape processing in visual cortex.

Jacqueline C Snow1, Lars Strother, Glyn W Humphreys

  • 1University of Nevada.

Journal of Cognitive Neuroscience
|December 19, 2013
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Summary
This summary is machine-generated.

Touch-based shape recognition activates visual brain areas, including the primary visual cortex. This suggests that the brain

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Sensory Processing

Background:

  • Humans primarily use vision for object shape identification.
  • Shape recognition is also possible through touch (haptics).
  • The neural basis for haptic shape recognition and its overlap with visual processing remains unclear.

Purpose of the Study:

  • To investigate the extent to which visual cortical mechanisms support haptic object recognition.
  • To identify neuronal populations involved in processing shape through touch.
  • To determine if visual processing areas are engaged during haptic exploration.

Main Methods:

  • Utilized a haptic functional magnetic resonance imaging (fMRI) repetition design.
  • Presented objects for tactile exploration without visual input.
  • Analyzed fMRI data for shape-selective responses and repetition effects.

Main Results:

  • Observed shape-selective fMRI responses in dorsal frontoparietal areas, as expected.
  • Detected widespread shape-selective responses in the ventral visual pathway, including the primary visual cortex.
  • Found shape-specific repetition effects in the primary visual cortex during haptic exploration.

Conclusions:

  • Haptic shape processing engages neural mechanisms shared with visual object recognition.
  • Visual sensory areas, including primary visual cortex, are activated during haptic shape exploration.
  • The visual system plays a fundamental role in processing object shape, even without visual input.