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Mass Action Principle (neuroscience)
In neuroscience, the mass action principle suggests that the proportion of the brain that is injured is directly proportional to the decreased ability of memory functions.
In other words, memory cannot be localized to a single cortical area, but is instead distributed throughout the cortex. This theory is contrasted by functional specialization. This is one of two principles that Karl Lashley published in 1950, alongside the equipotentiality principle.
==Early theories==
In the 19th century, animal researchers and scientists were divided into two main groups in terms of how they believe the brain compensated for induced brain damage. The redundancy theorists hypothesized that any lesioned section of cerebral mass had an almost duplicate section, usually on the opposing hemisphere. This "back-up" area was considered to be what takes over the functions of the lesioned area. On the other hand, vicariation theorists believed that different areas of the brain with different functions could assume responsibility for the affected area. Both ideas were highly debated and led to increased research on neuroplasticity and lesion research, eventually affecting the lesion research of Flourens and Lashley.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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