acallosaladj.n.
/ˌeɪkəˈləʊsl/, U.S. /ˌeɪkəˈloʊsəl/ Medicine.
A. adj.
Lacking a (functioning) corpus callosum; of or relating to the absence of the corpus callosum.
ΘΚΠ
the world > life > the body > nervous system > cerebrospinal axis > brain > parts of brain > [adjective] > commissure > having no spec.
acallosal1907
split-brain1958
1907 Jrnl. Anat. & Physiol. 41 234 This note is based upon the examination of the acallosal brains of two Fellahin women.
1940 C. E. Keeler in C. B. Davenport et al. Med. Genetics & Eugenics I. 105 Rarely, acallosal individuals have been reported in monkeys and man with no apparent disturbance of behavior.
1990 Brit. Jrnl. Developmental Psychol. 8 7 Children with callosal agenesis are able to develop perceptual and cognitive perspective taking. Thus, acallosal children do not perform in a comparable way to children with autism.
2009 Seminars Pediatric Neurol. 16 128/2 Many of these genes represent excellent candidates for human screens to identify the genetic basis of acallosal syndromes.
B. n.
An acallosal person or animal.
ΘΚΠ
the world > life > the body > nervous system > cerebrospinal axis > brain > parts of brain > [noun] > commissure > (person with) a brain lacking
acallosal1965
1965 M. A. Jeeves in Functions Corpus Callosum: Ciba Found. Study Group No. 20 1964 92 Unlike most other studies of acallosals or sectioned callosals the studies have concentrated on the..performance of acallosals.
1988 Neuropsychologia 26 153 The results showed that the time taken by the acallosal to grasp objects was almost twice that taken by normal controls.
2002 J. D. Stirling Introd. Neuropsychol. iii. 42 Acallosals also have difficulties with spatial tasks such as jigsaws, copying drawings, puzzles, depth perception and so on.
This entry has been updated (OED Third Edition, December 2011; most recently modified version published online December 2021).
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adj.n.1907