- Angular gyrus
Name = PAGENAME
Latin = gyrus angularis
Caption = Figure one illustrates significant language areas of the brain.
Brodmann area 39is highlighted in red.
Caption2 = Drawing of a cast to illustrate the relations of the brain to the skull. (Angular gyrus labeled at upper left, in yellow section.)
BrainInfoType = hier
BrainInfoNumber = 91
DorlandsPre = g_13
DorlandsSuf = 12405109
The angular gyrus is a region of the
brainin the parietal lobe, that lies near the superior edge of the temporal lobe, and immediately posterior to the supramarginal gyrus; it is involved in a number of processes related to language and cognition. It is Brodmann area 39of the human brain.
Use in language
Geschwindproposed that written word is translated to internal monologue via the angular gyrus.
V. S. Ramachandran, director of the
Center for Brain and Cognitionat the University of California, San Diego, directed a study that showed that the angular gyrus is at least partially responsible for understanding metaphors. Right-handedpatients who had damage to their left angular gyrus and whose speaking and comprehending English was seemingly unaffected, could not grasp the dual nature of metaphor. Given a common metaphorical phrase, each patient could give only a literal meaning. If pressed, they could invent a wild interpretation but it was well off the mark [V. S. Ramachandran, 2004. A Brief Tour of Human Consciousness. "Pi Press", pp.60-82.]
In another exercise, the patients all failed to be able to describe a bulbous object as "booba" and a jagged object as "kiki," whereas more than 90% of unaffected subjects succeeded in the . This showed an inability to connect visual stimuli to language.
The fact that the angular gyrus is proportionately much larger in hominids than other primates, and its strategic location at the crossroads of areas specialized for processing touch, hearing and vision, leads Ramachandran to believe that it is critical both to conceptual metaphors and to cross-modal abstractions more generally.
Recent experiments have demonstrated the possibility that stimulation of the angular gyrus is the cause of
out-of-body experiences. [ [http://www.nytimes.com/2006/10/03/health/psychology/03shad.html Out-of-Body Experience? Your Brain Is to Blame - New York Times ] ] Stimulation of the angular gyrus in one experiment caused a woman to perceive a phantom existence behind her. [Arzy, S., Seeck, M., Ortigue, S., Spinelli, L., Blanke, O., 2006. Induction of an illusory shadow person: Stimulation of a site on the brain's left hemisphere prompts the creepy feeling that somebody is close by. "Nature", 443(21), pp.287.] Another such experiment gave the test subject the sensation of being on the ceiling. This is attributed to a discrepancy in the actual position of the body, and the mind's perceived location of the body.
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Look at other dictionaries:
angular gyrus — n the cerebral gyrus of the posterior part of the external surface of the parietal lobe that arches over the posterior end of the sulcus between the superior and middle gyri of the temporal lobe called also angular convolution … Medical dictionary
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angular gyrus syndrome — a syndrome resulting from an infarction or other lesion of the angular gyrus on the dominant side; symptoms may include alexia or agraphia or may feature the symptoms of Gerstmann syndrome … Medical dictionary
artery of angular gyrus — ramus gyri angularis arteriae cerebri mediae … Medical dictionary
Gyrus — A gyrus (pl. gyri ) is a ridge on the cerebral cortex. It is generally surrounded by one or more sulci.Notable gyri* Fornicate gyrus * Superior frontal gyrus, lat . gyrus frontalis superior * Middle frontal gyrus, lat . gyrus frontalis medius *… … Wikipedia
gyrus angularis — [TA] angular gyrus: a convolution of the inferior parietal lobule, arching over the posterior end of the superior temporal sulcus and continuous with the middle temporal gyrus … Medical dictionary
gyrus temporalis medius — [TA] middle temporal gyrus: the convolution of the temporal lobe lying between the superior and the inferior temporal sulci; it is continuous posteriorly with the angular gyrus … Medical dictionary
angular convolution — noun or angular gyrus : one of the convolutions of the posterior part of the external surface of the parietal lobe of the cerebrum … Useful english dictionary
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gyrus — One of the prominent rounded elevations that form the cerebral hemispheres, each consisting of an exposed superficial portion and a portion hidden from view in the wall and floor of the sulcus. [L. fr. G. gyros, circle] angular g. [TA] a folded… … Medical dictionary