scholarly journals No Evidence of Improved Emotion Perception Through Unilateral Hand Contraction

2019 ◽  
Vol 127 (1) ◽  
pp. 126-141 ◽  
Author(s):  
Miloš Stanković ◽  
Milkica Nešić
Keyword(s):  
Facial Expressions ◽  
Right Hemisphere ◽  
Visual Fields ◽  
Reaction Times ◽  
Emotion Perception ◽  
Matching Task ◽  
Contralateral Hemisphere ◽  
Left Hand ◽  
Face Matching ◽  
The Right

Previous studies have identified improved cognitive performance from unilateral hand contraction to effect contralateral hemisphere activation. As little is known of whether this activation can improve emotion perception, this study examined any differences in perception accuracy and reaction times of matching photographs of human facial expressions presented to the left or right visual fields after left versus right hemisphere activation triggered by unilateral hand contractions. We used photographs of happy, sad, and neutral facial expressions presented briefly and simultaneously (two photographs in each presentation) either unilaterally (intrahemisphere condition) or bilaterally (interhemisphere condition). We recruited 68 university student participants (aged 19–23 years) and randomly assigned half of them to squeeze a dynamometer with the right hand, while the other half squeezed with the left hand, prior to performing the Dimond face-matching task. Matching of happy faces was faster than matching of sad faces. In females (but not males), perception accuracy was higher when stimuli were presented in the right (vs. left) visual field. We found no difference in emotion perception of photographs in either unilateral (intrahemispheric) or bilateral (interhemispheric) stimuli presentations as a function of hand contractions.

Vocal Reaction Times to Tachistoscopically Presented High- and Low-Frequency Verbs: Some Evidence for Selective Minor Hemisphere Linguistic Analysis

1988 ◽  
Vol 66 (3) ◽  
pp. 803-810 ◽  
Author(s):  
Michael P. Rastatter ◽  
Catherine Loren
Keyword(s):  
Visual Field ◽  
High Frequency ◽  
Right Hemisphere ◽  
Visual Fields ◽  
Reaction Times ◽  
Low Frequency ◽  
Normal Subjects ◽  
Right Visual Field ◽  
Intact Brain ◽  
The Right

The current study investigated the capacity of the right hemisphere to process verbs using a paradigm proven reliable for predicting differential, minor hemisphere lexical analysis in the normal, intact brain. Vocal reaction times of normal subjects were measured to unilaterally presented verbs of high and of low frequency. A significant interaction was noted between the stimulus items and visual fields. Post hoc tests showed that vocal reaction times to verbs of high frequency were significantly faster following right visual-field presentations (right hemisphere). No significant differences in vocal reaction time occurred between the two visual fields for the verbs of low frequency. Also, significant differences were observed between the two types of verbs following left visual-field presentation but not the right. These results were interpreted to suggest that right-hemispheric analysis was restricted to the verbs of high frequency in the presence of a dominant left hemisphere.

Tactile Discrimination of Direction of Lines in Relation to Hemispheric Specialization

1982 ◽  
Vol 54 (2) ◽  
pp. 655-660 ◽  
Author(s):  
Daniela Brizzolara ◽  
Gianni L. De Nobili ◽  
Giovanni Ferretti
Keyword(s):  
Right Hemisphere ◽  
Hemispheric Specialization ◽  
Line Orientation ◽  
Contralateral Hemisphere ◽  
Tactile Discrimination ◽  
Experimental Procedure ◽  
Left Hand ◽  
The Right ◽  
Exploratory Movements

The role of the right hemisphere in a task of haptic discrimination of line orientation was studied in 16 children aged 7–6 and 16 adults aged 25 yr. The exploratory movements were limited to hand and wrist, since it has been shown that distal movements are mediated by the contralateral hemisphere. A comparison of the performance of the two hands shows a clear superiority of the left hand and inferred right hemisphere in both children and adults. An especial emphasis in the discussion is given to the role of the experimental procedure in enhancing the effect of the hemispheric functional asymmetries.

Vocal Reaction Times of Stuttering Subjects to Tachistoscopically Presented Concrete and Abstract Words

1987 ◽  
Vol 30 (3) ◽  
pp. 306-310 ◽  
Author(s):  
Michael P. Rastatter ◽  
Carl Dell
Keyword(s):  
Language Processing ◽  
Right Hemisphere ◽  
Visual Fields ◽  
Reaction Times ◽  
Normal Subjects ◽  
Decision Task ◽  
Functional Localization ◽  
Past Data ◽  
Abstract Words ◽  
The Right

The present study was an attempt to investigate further the issues pertaining to cerebral organization for visual language processing in the stuttering population. Employing a lexical decision task, vocal reaction times were obtained for a group of 14 stutterers to unilateral, tachistoscopically presented concrete and abstract words. Results of an analysis of variance showed that a significant interaction occurred between visual fields and stimuli. Posthoc tests showed that the right hemisphere was superior for analyzing the concrete words while the left hemisphere was responsible for processing the abstract items. Compared to past data from normal subjects, these findings were interpreted as suggesting that some form of linguistic competition may exist between the two hemispheres, possibly reflecting a disturbance in functional localization in the stuttering population.

Influence of Vocabulary-Age on Unilateral Picture-Naming Reaction Times of Normal Subjects

1991 ◽  
Vol 73 (3) ◽  
pp. 1047-1054 ◽  
Author(s):  
Michael P. Rastatter ◽  
Richard McGuire ◽  
Gail Scukanec
Keyword(s):  
Picture Naming ◽  
Significant Interaction ◽  
Right Hemisphere ◽  
Visual Fields ◽  
Reaction Times ◽  
Normal Subjects ◽  
Clinical Literature ◽  
The Right ◽  
Post Hoc ◽  
Developmental Hierarchy

The present study measured naming reaction times of normal subjects to unilaterally presented pictures corresponding to vocabulary levels of < 5.5, 9.5–10.5, and >18.0 years of age. An analysis of variance of latencies showed a significant interaction between visual fields and stimuli. Post hoc tests were interpreted to suggest that the normal right hemisphere was capable of performing certain differential picture encoding operations up to 10.5 years of age and not beyond. Also, unlike the left hemisphere, the right hemisphere does not appear to be organized on a developmental hierarchy, which corresponds with the clinical literature.

Hemispheric Picture-Naming Hierarchies in Stuttering Subjects

1995 ◽  
Vol 81 (3) ◽  
pp. 899-908 ◽  
Author(s):  
Michael P. Rastatter ◽  
Andrew Stuart
Keyword(s):  
Picture Naming ◽  
Right Hemisphere ◽  
Visual Fields ◽  
Reaction Times ◽  
Main Effect ◽  
The Right ◽  
Post Hoc ◽  
Naming Latencies ◽  
Verbal Output ◽  
Vocabulary Score

The present study was done to investigate the linguistic organization of the right hemisphere of stuttering subjects and the interhemispheric interactions that underlie verbal output in this population. Naming reaction times of 14 stuttering adults were measured to unilaterally presented pictures corresponding to vocabulary levels of <5.5, 9.5–10.5, and > 18.0 years of age. An analysis of variance of latencies showed a significant main effect for picture vocabulary-age. Post hoc tests were interpreted as suggesting that the right hemisphere of stuttering subjects was capable of differential picture-encoding operations in a manner similar to the left hemisphere of normal speakers. Also, naming latencies favored left visual-field stimulations by 34 msec. Taken with significant and high correlations between visual fields for each level of picture vocabulary score, the right hemispheres of the stuttering subjects appeared responsible for picture-encoding operations. Left-hemispheric stimulus processing was not predicted, suggesting differences may exist in interhemispheric interactions underlying picture-naming functions in stuttering populations.

Role of Anterior and Posterior Attention Networks in Hemispheric Asymmetries during Lexical Decisions

1991 ◽  
Vol 3 (4) ◽  
pp. 313-321 ◽  
Author(s):  
Atsuko Nakagawa
Keyword(s):  
Left Hemisphere ◽  
Right Hemisphere ◽  
Visual Fields ◽  
Reaction Times ◽  
Attention Networks ◽  
Priming Task ◽  
Left And Right ◽  
The Right ◽  
Prime Target

The role of the left and right hemisphere was examined during semantic priming by antonyms, remote associates, and unrelated words. Targets presented directly to the left hemisphere showed an early facilitation and a late developing inhibition, while targets presented directly to the right hemisphere showed a late developing facilitation of strong and weak associations and little evidence of inhibition. When a visual cue was given prior to each target word, reaction times were facilitated equally in both visual fields and for all prime target relationships. When the priming task was combined with shadowing, reaction times generally increased and all evidence of inhibition in left hemisphere processing disappeared. This supported the idea that the inhibition found in the left hemisphere was due to its interaction with the anterior attention network.

scholarly journals Delusional Misidentification Incident in a Right Hemisphere Stroke Patient

1991 ◽  
Vol 4 (2) ◽  
pp. 81-87 ◽  
Author(s):  
Andrew W. Young ◽  
Brenda M. Flude ◽  
Andrew W. Ellis
Keyword(s):  
Facial Expressions ◽  
Cerebral Hemisphere ◽  
Right Hemisphere ◽  
Face Matching ◽  
Right Cerebral Hemisphere ◽  
Processing Abilities ◽  
Unfamiliar Face Matching ◽  
Unfamiliar Face ◽  
The Right ◽  
Right Hemisphere Stroke

We report a delusional misidentification incident lasting some hours in which a man who had suffered a right hemisphere stroke, HW, mistook a student for his daughter. Investigation of HW's face processing abilities showed unimpaired ability to recognize familiar faces and match facial expressions, but severe impairments of unfamiliar face matching both on the Benton test and a task requiring the matching of disguised and undisguised faces. The incident shows some similarity to the Frégoli delusion, which has also been noted following brain injury affecting the right cerebral hemisphere.

scholarly journals When brain damage “improves” perception: neglect patients can localize motion-shifted probes better than controls

2015 ◽  
Vol 114 (6) ◽  
pp. 3351-3358 ◽  
Author(s):  
Stefania de Vito ◽  
Marine Lunven ◽  
Clémence Bourlon ◽  
Christophe Duret ◽  
Patrick Cavanagh ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Visual Fields ◽  
Critical Factor ◽  
Significant Shift ◽  
Stimulus Motion ◽  
Attentional Processes ◽  
Position Shift ◽  
The Right ◽  
High Level ◽  
Better Than

When we look at bars flashed against a moving background, we see them displaced in the direction of the upcoming motion (flash-grab illusion). It is still debated whether these motion-induced position shifts are low-level, reflexive consequences of stimulus motion or high-level compensation engaged only when the stimulus is tracked with attention. To investigate whether attention is a causal factor for this striking illusory position shift, we evaluated the flash-grab illusion in six patients with damaged attentional networks in the right hemisphere and signs of left visual neglect and six age-matched controls. With stimuli in the top, right, and bottom visual fields, neglect patients experienced the same amount of illusion as controls. However, patients showed no significant shift when the test was presented in their left hemifield, despite having equally precise judgments. Thus, paradoxically, neglect patients perceived the position of the flash more veridically in their neglected hemifield. These results suggest that impaired attentional processes can reduce the interaction between a moving background and a superimposed stationary flash, and indicate that attention is a critical factor in generating the illusory motion-induced shifts of location.

Dominance of the Right Hemisphere and Role of Area 2 in Human Kinesthesia

2005 ◽  
Vol 93 (2) ◽  
pp. 1020-1034 ◽  
Author(s):  
Eiichi Naito ◽  
Per E. Roland ◽  
Christian Grefkes ◽  
H. J. Choi ◽  
Simon Eickhoff ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Anterior Part ◽  
Premotor Cortex ◽  
Superior Temporal Gyrus ◽  
Lateral Part ◽  
Left Hand ◽  
Hemisphere Dominance ◽  
The Right ◽  
Processus Styloideus ◽  
Motor Areas

We have previously shown that motor areas are engaged when subjects experience illusory limb movements elicited by tendon vibration. However, traditionally cytoarchitectonic area 2 is held responsible for kinesthesia. Here we use functional magnetic resonance imaging and cytoarchitectural mapping to examine whether area 2 is engaged in kinesthesia, whether it is engaged bilaterally because area 2 in non-human primates has strong callosal connections, which other areas are active members of the network for kinesthesia, and if there is a dominance for the right hemisphere in kinesthesia as has been suggested. Ten right-handed blindfolded healthy subjects participated. The tendon of the extensor carpi ulnaris muscles of the right or left hand was vibrated at 80 Hz, which elicited illusory palmar flexion in an immobile hand (illusion). As control we applied identical stimuli to the skin over the processus styloideus ulnae, which did not elicit any illusions (vibration). We found robust activations in cortical motor areas [areas 4a, 4p, 6; dorsal premotor cortex (PMD) and bilateral supplementary motor area (SMA)] and ipsilateral cerebellum during kinesthetic illusions (illusion-vibration). The illusions also activated contralateral area 2 and right area 2 was active in common irrespective of illusions of right or left hand. Right areas 44, 45, anterior part of intraparietal region (IP1) and caudo-lateral part of parietal opercular region (OP1), cortex rostral to PMD, anterior insula and superior temporal gyrus were also activated in common during illusions of right or left hand. These right-sided areas were significantly more activated than the corresponding areas in the left hemisphere. The present data, together with our previous results, suggest that human kinesthesia is associated with a network of active brain areas that consists of motor areas, cerebellum, and the right fronto-parietal areas including high-order somatosensory areas. Furthermore, our results provide evidence for a right hemisphere dominance for perception of limb movement.

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