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Related Concept Videos

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Diencephalon: Thalamus and Information Relay

The thalamus, often called “the gateway to the cerebral cortex,” is vital in processing and directing sensory and motor signals throughout the brain. Almost all inputs destined for the cerebral cortex, except for olfactory signals, are relayed through the thalamus. The thalamus is  a sophisticated relay station, channeling information from various brain regions to the cerebral cortex, as well as a filter, prioritizing certain signals over others based on current physiological states or needs.
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Sensory impulses related to touch, pressure, vibration, and proprioception from various body parts, such as the limbs, trunk, neck, and posterior head, travel to the cerebral cortex through the posterior column-medial lemniscus pathway. The pathway’s name derives from the two white-matter tracts that convey the impulses: the spinal cord's posterior column and the brainstem's medial lemniscus. First-order sensory neurons extend their axons into the spinal cord, forming the posterior columns...
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The human heart, despite its modest size and weight, is an organ of remarkable strength and endurance. Roughly the size of a fist, the heart weighs between 250 and 350 grams and is nestled within the mediastinum, the medial cavity of the thorax. It extends obliquely for about 12 to 14 cm, resting on the superior surface of the diaphragm. The heart is positioned anterior to the vertebral column and posterior to the sternum, with two-thirds of its mass lying to the left of the midsternal line.
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Locating volition.

Jing Zhu1

  • 1Faculty of Humanities and Social Sciences, Graduate School of the Chinese Academy of Sciences, Beijing, China 100039. hunanwill@yahoo.ca

Consciousness and Cognition
|May 12, 2004
PubMed
Summary

Neuroscience investigates volition by exploring its brain localization and neural underpinnings. Understanding the neural basis of volitional acts helps demystify conscious agency and decision-making.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Philosophy of Mind

Background:

  • Volition, defined as conscious and active agency in directing thoughts and actions, remains a complex concept.
  • Understanding the neural basis of volition is crucial for demystifying conscious will.
  • Previous research has explored psychological conceptualizations, but a unified neuroscientific understanding is lacking.

Purpose of the Study:

  • To examine how neuroscience can elucidate the nature of volition.
  • To address the question of whether volitions can be localized within the brain.
  • To explore the neural correlates and substrates of volitional acts.

Main Methods:

  • Review of methodological challenges in localizing volition in the brain.
  • Examination of neuroscientific and psychological approaches to identify neural correlates of volition.

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  • Analysis of empirical findings on brain areas and structures associated with volition.
  • Main Results:

    • Convergence of findings on specific brain areas and structures involved in volition.
    • Identification of common neural substrates across different conceptualizations of volition.
    • Methodological issues in localizing volition were discussed.

    Conclusions:

    • Neuroscience offers valuable insights into the nature and localization of volition.
    • Common brain regions support volitional processes, suggesting a unified neural basis.
    • A unifying conception of volition can better interpret empirical findings.