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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 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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Quantity without numbers and numbers without quantity in the parietal cortex.

Marinella Cappelletti1, Neil Muggleton, Vincent Walsh

  • 1Institute of Cognitive Neuroscience and Dept of Psychology, University College London, 17 Queen Square, London WC1N 3AR, UK. m.cappelletti@ucl.ac.uk

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Summary
This summary is machine-generated.

The intraparietal sulcus (IPS) is crucial for numerical cognition, but not solely for quantity processing. It

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Brain Research

Background:

  • The intraparietal sulcus (IPS) is widely believed to be central to numerical cognition, particularly for processing numerical quantity.
  • Existing research has not clarified if the IPS's role extends to non-numerical quantity judgments or broader conceptual number tasks.
  • The automaticity of number processing and its reliance on the IPS remain subjects of debate.

Purpose of the Study:

  • To investigate the specificity of the intraparietal sulcus (IPS) in numerical cognition.
  • To determine if the IPS is involved in processing non-numerical quantity information.
  • To examine the IPS's role in conceptual tasks that extend beyond simple quantity comparison.

Main Methods:

  • Functional magnetic resonance imaging (fMRI)-guided transcranial magnetic stimulation (TMS) was applied to the left and right IPS.
  • Stimulus type (numerical vs. non-numerical) and task demands (quantity judgment vs. conceptual task) were independently manipulated.
  • Behavioral responses were assessed to determine the impact of IPS disruption on different cognitive processes.

Main Results:

  • Disrupting the IPS equally impaired quantity judgments for both numerical and non-numerical stimuli.
  • A conceptual task involving numbers, but not quantity comparison, was also affected by IPS disruption.
  • Perceptual decisions on numbers (e.g., color judgment) and non-numerical conceptual tasks were unaffected by IPS-TMS.

Conclusions:

  • The IPS plays a role in numerical cognition that is not limited to numerical stimuli or quantity processing.
  • IPS involvement is necessary for conceptual operations specifically oriented towards numerical concepts.
  • These findings challenge the view that number processing is automatic and always engages the IPS for magnitude representation.