Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan


  • Jennifer Sue KleinerEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_729


Equipotentiality– a notion developed by Karl Spencer Lashley (1890–1958) positing that all areas of the brain are equally able to perform a task. This contrasts with the theory of localization, according to which neurocognitive functions are specifically referable to discrete areas of the brain; hence, damage to restricted regions would be expected to produce selective cognitive deficits. Equipotentiality theory, however, hypothesized that the severity of cognitive dysfunction was directly related to the total amount of tissue damage. For example, memory functioning was thought to be diffusely distributed throughout the cortex rather than related to defined circuits or pathways. Under this theory, intact areas of the cortex could assume responsibility for discrete cognitive functions following injury. The theory did allow, however, for localization related to sensory and motor processes. The related concept of “mass action” posited that cognitive functions are equally and...

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References and Readings

  1. Lashley, K. S. (1929). Brain mechanisms and intelligence. Chicago: University of Chicago Press.Google Scholar
  2. Lashley, K. S. (1930). Basic neural mechanisms in behavior. Psychological Review, 37, 1–24.CrossRefGoogle Scholar

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of PsychologyUniversity of Arkansas for Medical Sciences Blandford Physician CenterLittle RockUSA