Definition

1. Noun:
   • A neurological principle: The "mass-action principle" is a concept in neurology stating that the cerebral cortex functions as an integrated, coordinated whole. It posits that large areas of brain tissue work together in complex cognitive processes, rather than specific functions being localized to tiny, discrete regions.

Usage Examples

• Noun:
  • The scientist explained the mass-action principle to the class, describing how memory involves widespread cortical networks.
  • Early 20th-century research on brain lesions supported the mass-action principle, suggesting that cognitive impairment correlated with the amount of tissue damaged, not just its location.

Advanced Usage

• In historical context: The principle, associated with psychologist Karl Lashley, was formulated as a counterpoint to strict theories of cerebral localization. It emphasizes holistic brain function.
  • Debates between proponents of localization and the mass-action principle shaped early neuroscience.

Variants and Related Words

• Mass action (noun phrase): Often used interchangeably with "mass-action principle" in historical texts.
  • The theory of mass action challenged the idea of a precise "memory center" in the brain.

Synonyms

• Holistic brain theory: A general term for theories emphasizing whole-brain integration in function.
• Equipotentiality (noun): A closely related, more specific principle suggesting that within functional areas, any part can perform the function of any other part.

Related Phrases

• Principle of mass action: A full, alternative phrasing for the term.
  • The principle of mass action argues for distributed neural processing.

Noun

1. (neurology) the principle that the cortex of the brain operates as a coordinated system with large masses of neural tissue involved in all complex functioning