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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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The hippocampus, a critical brain structure, plays an essential role in memory processing, particularly in the formation and retrieval of memory. This small, seahorse-shaped region is located within the medial temporal lobe, with one hippocampus in each brain hemisphere. Experimental studies involving lesions in the hippocampi of rats have demonstrated significant impairments in tasks such as object recognition and maze navigation, indicating the hippocampus involvement in both recognition and...
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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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Behavioral Assessment of Manual Dexterity in Non-Human Primates
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Preserved Haptic Shape Processing after Bilateral LOC Lesions.

Jacqueline C Snow1, Melvyn A Goodale2, Jody C Culham2

  • 1Department of Psychology, University of Nevada, Reno, Nevada 89557, and jacqueline.c.snow@gmail.com snow@unr.edu.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|October 9, 2015
PubMed
Summary
This summary is machine-generated.

The lateral occipital complex (LOC) is not essential for recognizing object shapes through touch. Even with vision impairment, individuals can still identify objects by feel, showing intact haptic shape recognition abilities.

Keywords:
hapticlateral occipital complexneuropsychological fMRIshape perception

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Perception

Background:

  • The lateral occipital complex (LOC) is believed to be crucial for processing object shape information from both visual and haptic sensory systems.
  • Previous research suggests a shared neural representation for visual and haptic shape, implicating the LOC in both modalities.

Purpose of the Study:

  • To investigate the necessity of the LOC for haptic shape recognition in humans.
  • To determine if damage to the LOC affects the ability to recognize objects through touch.

Main Methods:

  • Studied a patient (M.C.) with bilateral LOC lesions, assessing behavioral responses and brain activation (fMRI) during haptic object exploration.
  • Compared M.C.'s performance and brain activity to those of healthy controls.

Main Results:

  • The patient (M.C.) exhibited severe visual recognition deficits but retained accurate haptic object recognition.
  • M.C.'s psychophysical sensitivity to haptic stimuli was comparable to controls.
  • fMRI revealed no LOC activation for visual or haptic tasks in M.C., yet her haptic activation patterns in other brain regions were similar to controls.

Conclusions:

  • The lateral occipital complex (LOC) is not essential for haptic shape recognition.
  • Object shape recognition via touch can occur independently of the LOC, challenging the notion of a universally critical role for this region in both visual and haptic perception.