mass action
Definition
Noun: 1. (Neuroscience) The principle that complex brain functions, such as thought, memory, and perception, are not localized to a single, specific area but are instead the product of the integrated activity of large, coordinated masses of neural tissue across the cerebral cortex.
Usage
This term is a specialized scientific concept used primarily in neurology and neuroscience to describe a foundational theory of brain organization. * It is often discussed in contrast to theories of strict localization of function. * It is used to explain how damage to a broad area of the cortex can impair general cognitive abilities rather than a single, specific function.
Examples
- The scientist's research on brain injuries supported the principle of mass action, showing that intelligence declined in proportion to the amount of cortex removed, not its specific location.
- Early 20th-century theories of mass action proposed that the brain worked as a whole, rather than as a collection of independent modules.
- The concept of mass action helps explain the brain's remarkable ability to reorganize and recover some functions after injury.
Advanced Usage
- In historical context: The theory of mass action, often associated with psychologist Karl Lashley, was developed from experiments on learning and memory in rats. It posited that the efficiency of learning is proportional to the amount of remaining cortical tissue.
- In modern neuroscience: While specific functions are now known to be more localized than mass action originally suggested, the principle remains relevant for understanding distributed neural networks, plasticity, and higher-order cognitive processes that integrate information from multiple brain regions.
Variants and Related Words
- Mass action principle: A fuller name for the concept.
- Equipotentiality (noun): A closely related principle, also associated with Lashley, suggesting that within functional areas, any part of the cortex can potentially perform the function of another part.
Synonyms
- Holistic brain function
- Distributed processing (in a modern context)
Antonyms
- Localization of function
- Phrenology (as a historical contrast)
- Modularity (in some contexts)
Noun
-
(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
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