Variable Left-hemisphere Language and Orthographic Lateralization Reduces Right-hemisphere Face Lateralization

2015 ◽  
Vol 27 (5) ◽  
pp. 913-925 ◽  
Author(s):  
Eva M. Dundas ◽  
David C. Plaut ◽  
Marlene Behrmann
Keyword(s):  
Left Hemisphere ◽  
Face Processing ◽  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Neural Systems ◽  
Discrimination Accuracy ◽  
Left Handed ◽  
Representational Space ◽  
The Right ◽  
Interactive Account

It is commonly believed that, in right-handed individuals, words and faces are processed by distinct neural systems: one in the left hemisphere (LH) for words and the other in the right hemisphere (RH) for faces. Emerging evidence suggests, however, that hemispheric selectivity for words and for faces may not be independent of each other. One recent account suggests that words become lateralized to the LH to interact more effectively with language regions, and subsequently, as a result of competition with words for representational space, faces become lateralized to the RH. On this interactive account, left-handed individuals, who as a group show greater variability with respect to hemispheric language dominance, might be expected to show greater variability in their degree of RH lateralization of faces as well. The current study uses behavioral measures and ERPs to compare the hemispheric specialization for both words and faces in right- and left-handed adult individuals. Although both right- and left-handed groups demonstrated LH over RH superiority in discrimination accuracy for words, only the right-handed group demonstrated RH over LH advantage in discrimination accuracy for faces. Consistent with this, increased right-handedness was related to an increase in RH superiority for face processing, as measured by the strength of the N170 ERP component. Interestingly, the degree of RH behavioral superiority for face processing and the amplitude of the RH N170 for faces could be predicted by the magnitude of the N170 ERP response to words in the LH. These results are discussed in terms of a theoretical account in which the typical RH face lateralization fails to emerge in individuals with atypical language lateralization because of weakened competition from the LH representation of words.

Separable Mechanisms in Face Processing: Evidence from Hemispheric Specialization

1991 ◽  
Vol 3 (1) ◽  
pp. 42-58 ◽  
Author(s):  
Lynn A. Hillger ◽  
Olivier Koenig
Keyword(s):  
Left Hemisphere ◽  
Face Processing ◽  
Visual Processing ◽  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Facial Feature ◽  
General Purpose ◽  
Facial Features ◽  
Left And Right ◽  
The Right

This article addresses three issues in face processing: First, is face processing primarily accomplished by the right hemisphere, or do both left- and right-hemisphere mechanisms play important roles? Second, are the mechanisms the same as those involved in general visual processing, or are they dedicated to face processing? Third, how can the mechanisms be characterized more precisely in terms of processes such as visual parsing? We explored these issues using the divided visual field methodology in four experiments. Experiments 1 and 2 provided evidence that both left- and right-hemisphere mechanisms are involved in face processing. In Experiment 1, a right-hemisphere advantage was found for both Same and Different trials when Same faces were identical and Different faces differed on all three internal facial features. Experiment 2 replicated the right-hemisphere advantage for Same trials but showed a left-hemisphere advantage for Different trials when one of three facial features differed between the target and the probe faces. Experiment 3 showed that the right-hemisphere advantage obtained with upright faces in Experiment 2 disappeared when the faces were inverted. This result suggests that there are right-hemisphere mechanisms specialized for processing upright faces, although it could not be determined whether these mechanisms are completely face-specific. Experiment 3 also provided evidence that the left-hemisphere mechanisms utilized in face processing tasks are general-purpose visual mechanisms not restricted to particular classes of visual stimuli. In Experiment 4, a left-hemisphere advantage was obtained when the task was to find one facial feature that was the same between the target and the probe faces. We suggest that left-hemisphere advantages shown in face processing are due to the parsing and analysis of the local elements of a face.

Hemispheric Specialization and Cognitive Development: Implications for Mathematics Education

1978 ◽  
Vol 9 (1) ◽  
pp. 20-32
Author(s):  
Grayson H. Wheatley ◽  
Robert Mitchell ◽  
Robert L. Frankland ◽  
Rosemarie Kraft
Keyword(s):  
Left Hemisphere ◽  
Hemispheric Asymmetry ◽  
Right Hemisphere ◽  
Mathematics Curriculum ◽  
Hemispheric Specialization ◽  
Brain Hemispheres ◽  
Spatial Tasks ◽  
Concrete Operational ◽  
The Right ◽  
Hemisphere Specialization

Evidence is presented for hemisphere specialization of the two brain hemispheres: the left hemisphere specialized for logico-analytic tasks and the right hemisphere, visuo-spatial tasks. A hypothesis is put forth for the emergence of the specialization that suggests a shift from predominant right hemisphere processing in infancy to predominant left hemisphere processing in adulthood. Results of the studies reviewed suggest the emergence of concrete-operational thought as the left hemisphere becomes capable of processing logical tasks. Electroencephalography seems particularly useful in determining specialization and mapping changes in hemispheric asymmetry. Implications for school mathematics curriculum are presented.

scholarly journals Handedness Does Not Impact Inhibitory Control, but Movement Execution and Reactive Inhibition Are More under a Left-Hemisphere Control

Symmetry ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1602
Author(s):  
Christian Mancini ◽  
Giovanni Mirabella
Keyword(s):  
Left Hemisphere ◽  
Inhibitory Control ◽  
Right Hemisphere ◽  
Dominant Role ◽  
Hemispheric Specialization ◽  
Arm Movement ◽  
Proactive Inhibition ◽  
Stop Signal Task ◽  
The Right

The relationship between handedness, laterality, and inhibitory control is a valuable benchmark for testing the hypothesis of the right-hemispheric specialization of inhibition. According to this theory, and given that to stop a limb movement, it is sufficient to alter the activity of the contralateral hemisphere, then suppressing a left arm movement should be faster than suppressing a right-arm movement. This is because, in the latter case, inhibitory commands produced in the right hemisphere should be sent to the other hemisphere. Further, as lateralization of cognitive functions in left-handers is less pronounced than in right-handers, in the former, the inhibitory control should rely on both hemispheres. We tested these predictions on a medium-large sample of left- and right-handers (n = 52). Each participant completed two sessions of the reaching versions of the stop-signal task, one using the right arm and one using the left arm. We found that reactive and proactive inhibition do not differ according to handedness. However, we found a significant advantage of the right versus the left arm in canceling movements outright. By contrast, there were no differences in proactive inhibition. As we also found that participants performed movements faster with the right than with the left arm, we interpret our results in light of the dominant role of the left hemisphere in some aspects of motor control.

scholarly journals Upright or inverted, entire or exploded: right-hemispheric superiority in face recognition withstands multiple spatial manipulations

PeerJ ◽  
2015 ◽  
Vol 3 ◽  
pp. e1456 ◽  
Author(s):  
Giulia Prete ◽  
Daniele Marzoli ◽  
Luca Tommasi
Keyword(s):  
Face Recognition ◽  
Social Interactions ◽  
Face Processing ◽  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Spatial Relations ◽  
Hemispheric Lateralization ◽  
Social Stimuli ◽  
Identity Recognition ◽  
The Right

Background.The ability to identify faces has been interpreted as a cerebral specialization based on the evolutionary importance of these social stimuli, and a number of studies have shown that this function is mainly lateralized in the right hemisphere. The aim of this study was to assess the right-hemispheric specialization in face recognition in unfamiliar circumstances.Methods.Using a divided visual field paradigm, we investigated hemispheric asymmetries in the matching of two subsequent faces, using two types of transformation hindering identity recognition, namely upside-down rotation and spatial “explosion” (female and male faces were fractured into parts so that their mutual spatial relations were left intact), as well as their combination.Results.We confirmed the right-hemispheric superiority in face processing. Moreover, we found a decrease of the identity recognition for more extreme “levels of explosion” and for faces presented upside-down (either as sample or target stimuli) than for faces presented upright, as well as an advantage in the matching of female compared to male faces.Discussion.We conclude that the right-hemispheric superiority for face processing is not an epiphenomenon of our expertise, because we are not often exposed to inverted and “exploded” faces, but rather a robust hemispheric lateralization. We speculate that these results could be attributable to the prevalence of right-handedness in humans and/or to early biases in social interactions.

scholarly journals Representations of Facial Identity in the Left Hemisphere Require Right Hemisphere Processing

2012 ◽  
Vol 24 (4) ◽  
pp. 1006-1017 ◽  
Author(s):  
Sara C. Verosky ◽  
Nicholas B. Turk-Browne
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Right Visual Field ◽  
Fusiform Face Area ◽  
Identity Information ◽  
Facial Identity ◽  
Face Area ◽  
The Right ◽  
Fmri Adaptation

A quintessential example of hemispheric specialization in the human brain is that the right hemisphere is specialized for face perception. However, because the visual system is organized contralaterally, what happens when faces appear in the right visual field and are projected to the nonspecialized left hemisphere? We used divided field presentation and fMRI adaptation to test the hypothesis that the left hemisphere can recognize faces, but only with support from the right hemisphere. Consistent with this hypothesis, facial identity adaptation was observed in the left fusiform face area when a face had previously been processed by the right hemisphere, but not when it had only been processed by the left hemisphere. These results imply that facial identity information is transferred from the right hemisphere to the left hemisphere, and that the left hemisphere can represent facial identity but is less efficient at extracting this information by itself.

Monitoring the Visual World: Hemispheric Asymmetries and Subcortical Processes in Attention

1994 ◽  
Vol 6 (3) ◽  
pp. 267-275 ◽  
Author(s):  
G. R. Mangun ◽  
S. J. Luck ◽  
R. Plager ◽  
W. Loftus ◽  
S. A. Hillyard ◽  
...  
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Reaction Times ◽  
Attentional Deficits ◽  
Cortical Level ◽  
Visual Hemifield ◽  
Spatial Cuing ◽  
The Right ◽  
Subsequent Target

Hemispheric specialization and subcortical processes in visual anention were investigated in callosotomy (split-brain) patients by measuring reaction times to lateralized stimuli in a spatial cuing paradigm. Cuing effects were obtained for targets presented to the right hemisphere (left visual hemifield) but not for those presented to the left hemisphere. These cuing effects were manifest as faster reaction times when the cue correctly indicated the location of the subsequent target (valid trials), as compared to trials in which the cue and target appeared in opposite hemifields (invalid trials). This pattern suggests that the right hemisphere allocated attention to cued locations in either visual hemifield, whereas the left hemisphere allocated attention predominantly to the right hemifield. This finding is consistent with a body of evidence from studies in patients with cortical lesions who display different attentional deficits for right versus left hemisphere damage. Because the present pattern occurs in patients whose cerebral hemispheres are separated at the cortical level, it suggests that right hemisphere attentional allocation to events in the ipsilateral visual half-field is mediated in part via intact subcortical systems.

The nature of hemispheric specialization in man

1981 ◽  
Vol 4 (1) ◽  
pp. 51-63 ◽  
Author(s):  
J. L. Bradshaw ◽  
N. C. Nettleton
Keyword(s):  
Left Hemisphere ◽  
Temporal Order ◽  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Time Dependent ◽  
Cerebral Lateralization ◽  
Verbal Processing ◽  
Special Cases ◽  
The One ◽  
The Right

AbstractThe traditional verbal/nonverbal dichotomy is inadequate for completely describing cerebral lateralization. Musical functions are not necessarily mediated by the right hemisphere; evidence for a specialist left-hemisphere mechanism dedicated to the encoded speech signal is weakening, and the right hemisphere possesses considerable comprehensional powers. Right-hemisphere processing is often said to be characterized by holistic or gestalt apprehension, and face recognition may be mediated by this hemisphere partly because of these powers, partly because of the right hemisphere's involvement in emotional affect, and possibly through the hypothesized existence of a specialist face processor or processors in the right. The latter hypothesis may, however, suffer the same fate as the one relating to a specialist encodedness processor for speech in the left. Verbal processing is largely the province of the left because of this hemisphere's possession of sequential, analytic, time-dependent mechanisms. Other distinctions (e.g., focal/diffuse and serial/parallel) are special cases of an analytic/holistic dichotomy. More fundamentally, however, the left hemisphere is characterized by its mediation of discriminations involving duration, temporal order, sequencing, and rhythm, at thesensory(tactual, visual, and, above all, auditory) level, and especially at themotorlevel (for fingers, limbs, and, above all, the speech apparatus). Spatial aspects characterize the right, the mapping of exteroceptive body space, and the positions of fingers, limbs, and perhaps articulators, with respect to actual and target positions. Thus there is a continuum of function between the hemispheres, rather than a rigid dichotomy, the differences being quantitative rather than qualitative, of degree rather than of kind.

Evoked Potential Correlates of Recovery from Aphasia after Focal Left Hemisphere Injury in Adults

Neurosurgery ◽  
1984 ◽  
Vol 14 (4) ◽  
pp. 412-415 ◽  
Author(s):  
C. Papanicolaou Andrew ◽  
S. Levin Harvey ◽  
M. Eisenberg Howard
Keyword(s):  
Left Hemisphere ◽  
Verbal Memory ◽  
Evoked Potential ◽  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Memory Task ◽  
Normal Subjects ◽  
Hemispheric Activation ◽  
Cerebral Reorganization ◽  
The Right

Abstract An evoked potentials (EPs) paradigm that has been effective in demonstrating asymmetries in hemispheric activation during cognitive tasks was used to assess cerebral reorganization for language in recovered aphasics. Cortical click EPs were recorded bilaterally in normal volunteers, recovered aphasics who had sustained focal left hemisphere injury, and nonaphasic patients with diffuse injuries during a control condition of attending only to the click and during a verbal memory task. During that task, EP amplitude attenuation occurred in the left hemisphere for the normal subjects and the nonaphasic patients and in the right hemisphere for the recovered aphasics. These contrasting asymmetries in hemispheric activation suggest that a shift of hemispheric specialization for verbal processing contributes to the recovery of linguistic competence in adult aphasics.

scholarly journals Psychic Tonus, Body Schema and the Parietal Lobes: A Multiple Lesion Case Analysis

2007 ◽  
Vol 18 (2) ◽  
pp. 65-80 ◽  
Author(s):  
C. M. J. Braun ◽  
S. Desjardins ◽  
S. Gaudelet ◽  
A. Guimond
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Body Schema ◽  
The Body ◽  
Parietal Lobes ◽  
Hemisphere Lesion ◽  
The Right ◽  
Internal Experience ◽  
And Behavior

The psychic tonus model (Braun and colleagues, 1999, 2002, 2003, 2006) states that the left hemisphere is a “booster” of internal experience and behavior in general, and that the right hemisphere is a “dampener”. Twenty-five patients with a “positive” extreme disturbance of body schema (somatoparaphrenia) and 37 patients with a “negative” disturbance of body schema (autotopagnosia or Gerstmann’s syndrome), all following a unilateral parietal lesion, were found in the literature and were analyzed to test predictions from Braun’s “psychic tonus” model. As expected, patients with a positive syndrome had a right hemisphere lesion significantly more frequently, and those with a negative syndrome had a left hemisphere lesion significantly more frequently. Thus the psychic tonus model of hemispheric specialization, previously supported with regard to psychomotor baseline, libido, talkativeness, memory, auditory and visual perceptual tonus, now incorporates the tonus of representation of the body (body schema) in the parietal lobes.

Are “Presences” Preferentially Felt along the Left Side of One's Body?

1994 ◽  
Vol 79 (3) ◽  
pp. 1200-1202 ◽  
Author(s):  
Peter Brugger
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Sense Of Self ◽  
Hemispheric Specialization ◽  
The Body ◽  
The Self ◽  
Brain Pathology ◽  
Healthy Individuals ◽  
Physical Presence ◽  
The Right

The “feeling of a presence” is the distinct awareness of the physical presence of somebody in the near extracorporeal space. Although fairly frequently confined to one side of the body, systematic documentation of the lateralization of the phenomenon has not yet been attempted. A brief tabular summary of 11 cases of the unilateral feeling of a presence in association with focal brain pathology (seven left-hemisphere lesions, four right-hemisphere lesions) shows lateralization to the left in five, to the right in six cases. The data, together with the scattered reports of unilaterally felt presences in patients with nonfocal brain pathology and in healthy individuals, do not support claims that the left hemispace is the preferred location. Any models of hemispheric specialization in the sense of self which are derived from observations of felt presences remain speculative. Nevertheless, clinicians are encouraged to document carefully all the unilateral aspects of the feeling of a presence as well as of other reduplicative phenomena involving the self.

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