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Related Concept Videos

Somatosensation01:33

Somatosensation

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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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Neural Circuits01:25

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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
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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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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.
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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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How Data are Classified: Numerical Data00:59

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Data that are countable or measurable in specific units are called numerical or quantitative data. Quantitative data are always numbers. Quantitative data are the result of counting or measuring the attributes of a population. Amount of money, pulse rate, weight, number of people living in a town, and number of students who opt for statistics are examples of quantitative data.
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Related Experiment Video

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Knowing What Counts: Unbiased Stereology in the Non-human Primate Brain
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Numerosity representation is encoded in human subcortex.

Elliot Collins1,2,3, Joonkoo Park4, Marlene Behrmann5,2

  • 1Department of Psychology, Carnegie Mellon University, Pittsburgh PA 15213-3890.

Proceedings of the National Academy of Sciences of the United States of America
|March 22, 2017
PubMed
Summary
This summary is machine-generated.

Human adults use subcortical brain regions for numerical tasks, similar to infants and animals. This suggests evolutionarily conserved numerical abilities processed in lower-order brain structures, not just the cortex.

Keywords:
developmentnumerical cognitionphylogenysubcortexvision

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Area of Science:

  • Neuroscience
  • Comparative Cognition
  • Evolutionary Biology

Background:

  • Numerical competence, including quantity discrimination, is observed across diverse species, from primates to fish and spiders.
  • This ubiquity suggests that numerical abilities are supported by evolutionarily conserved neural systems.
  • Existing theories often attribute numerical cognition primarily to higher-order cortical processing.

Purpose of the Study:

  • To investigate whether lower-order brain structures in humans contribute to the evaluation of relative numerical quantities.
  • To test the hypothesis of conserved subcortical mechanisms for numerical tasks in adult humans.

Main Methods:

  • Employed a monocular/dichoptic visual paradigm across four experiments.
  • Utilized displays with varying numbers of dots (small: 1-4; large: 5-80).
  • Analyzed performance based on numerical ratios (e.g., 3:1, 4:1 vs. ratios closer to 1:1).

Main Results:

  • Discrimination of dot quantities was facilitated in the monocular, subcortical visual system.
  • This facilitation occurred specifically with larger numerical ratios (3:1, 4:1), not smaller ones.
  • Performance patterns mirrored those seen in newborn infants and other non-primate species.

Conclusions:

  • Adult human numerical abilities, particularly quantity discrimination, involve conserved, lower-order subcortical systems.
  • Findings challenge theories focusing solely on cortical involvement in numerical cognition.
  • Supports the cross-species continuity of biological systems underlying numerical abilities.