Self recognition and social awareness in the deconnected minor hemisphere

Sperry, R. W.; Zaidel, Eran; Zaidel, Dahlia W.

doi:10.1016/0028-3932(79)90006-x

Cited by 270 publications

(122 citation statements)

References 15 publications

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“…Sperry et al 1979). Chicks also show a right-hemisphere bias in processing the gaze direction of a predator (Rosa Salva et al 2007), which is interesting because it involves both response to a predator and social cognition-the ability to respond to social cues.…”

Section: Laterality In Non-human Species (A) Handednessmentioning

confidence: 99%

The evolution and genetics of cerebral asymmetry

Corballis

2008

Phil. Trans. R. Soc. B

236

167

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Handedness and cerebral asymmetry are commonly assumed to be uniquely human, and even defining characteristics of our species. This is increasingly refuted by the evidence of behavioural asymmetries in non-human species. Although complex manual skill and language are indeed unique to our species and are represented asymmetrically in the brain, some non-human asymmetries appear to be precursors, and others are shared between humans and non-humans. In all behavioural and cerebral asymmetries so far investigated, a minority of individuals reverse or negate the dominant asymmetry, suggesting that such asymmetries are best understood in the context of the overriding bilateral symmetry of the brain and body, and a trade-off between the relative advantages and disadvantages of symmetry and asymmetry. Genetic models of handedness, for example, typically postulate a gene with two alleles, one disposing towards right-handedness and the other imposing no directional influence. There is as yet no convincing evidence as to the location of this putative gene, suggesting that several genes may be involved, or that the gene may be monomorphic with variations due to environmental or epigenetic influences. Nevertheless, it is suggested that, in behavioural, neurological and evolutionary terms, it may be more profitable to examine the degree rather than the direction of asymmetry.

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Section: Laterality In Non-human Species (A) Handednessmentioning

confidence: 99%

The evolution and genetics of cerebral asymmetry

Corballis

2008

Phil. Trans. R. Soc. B

236

167

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“…The fact that these SR changes were observed even when stimuli could not be verbally identified by the mute RH led Preilowski to bassume the existence of conscious awareness in the dmute, minorT as well as in the dspeaking, majorT cortical halfQ. Sperry et al (1979) also tested the abilities of the disconnected hemispheres to respond to self-images and reported that commissurotomy patients had no trouble identifying portraits of themselves with either hemisphere. Further, both disconnected hemispheres had similar associations with self, including social preferences, and narrative self-concepts.…”

Section: Introductionmentioning

confidence: 99%

Self-face recognition activates a frontoparietal “mirror” network in the right hemisphere: an event-related fMRI study

et al. 2005

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Self-recognition has been demonstrated by a select number of primate species and is often used as an index of self-awareness. Whether a specialized neural mechanism for self-face recognition in humans exists remains unclear. We used event-related fMRI to investigate brain regions selectively activated by images of one's own face. Ten righthanded normal subjects viewed digital morphs between their own face and a gender-matched familiar other presented in a random sequence. Subjects were instructed to press a button with the right hand if the image looked like their own face, and another button if it looked like a familiar or scrambled face. Contrasting the trials in which images contain more bselfQ with those containing more familiar botherQ revealed signal changes in the right hemisphere (RH) including the inferior parietal lobule, inferior frontal gyrus, and inferior occipital gyrus. The opposite contrast revealed voxels with higher signal intensity for images of botherQ than for bselfQ in the medial prefrontal cortex and precuneus. Additional contrasts against baseline revealed that activity in the bselfQ minus botherQ contrasts represent signal increases compared to baseline (null events) in bselfQ trials, while activity in the botherQ minus bselfQ contrasts represent deactivations relative to baseline during bselfQ trials. Thus, a unique network involving frontoparietal structures described as part of the bmirror neuron systemQ in the RH underlies self-face recognition, while regions comprising the bdefault/resting stateQ network deactivate less for familiar others. We provide a model that reconciles these findings and previously published work to account for the modulations in these two networks previously implicated in social cognition. D 2004 Elsevier Inc. All rights reserved.

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“…Hence, many researchers view self-recognition as an indicator of self-awareness (see Gallup et al, 2003). Recently, the question of whether there are neural mechanisms which are distinctively related to the process of self-recognition (as compared with the recognition of other familiar people) has drawn the attention of a growing number of cognitive neuroscientists (for recent reviews see Gillihan The examination of split-brain patients has demonstrated that both hemispheres are capable of self-recognition (Sperry et al, 1979;Uddin et al, 2005b). However, evidence that self-recognition preferentially involves the right hemisphere has been reported.…”

Section: Introductionmentioning

confidence: 99%

Here I am: The cortical correlates of visual self-recognition

et al. 2007

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Recently, interest in the neural correlates of self-recognition has grown. Most studies concentrate on self-face recognition. However, there is a lack of convergence as to precise neuroanatomical locations underlying self-face recognition. In addition, recognition of familiar persons from bodies has been relatively neglected. In the present study, cerebral activity while participants performed a task in which they had to indicate the real appearance of themselves and of a gender-matched close colleague among intact and altered pictures of faces and bodies was measured. The right frontal cortex and the insula were found to be the main regions specifically implicated in visual self-recognition compared with visual processing of other highly familiar persons. Moreover, the right anterior insula along with the right anterior cingulate seemed to play a role in the integration of information about oneself independently of the stimulus domain. The processing of self-related pictures was also compared to scrambled versions of these pictures. Results showed that different areas of the occipito-temporal cortex were more or less recruited depending on whether a face or a body was perceived, as it has already been reported by several recent studies. The implication of present findings for a general framework of person identification is discussed.

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Self recognition and social awareness in the deconnected minor hemisphere

Cited by 270 publications

References 15 publications

The evolution and genetics of cerebral asymmetry

The evolution and genetics of cerebral asymmetry

Self-face recognition activates a frontoparietal “mirror” network in the right hemisphere: an event-related fMRI study

Here I am: The cortical correlates of visual self-recognition

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