Orthographic Neighborhood Effects in the Right but Not in the Left Cerebral Hemisphere

2002 ◽  
Vol 80 (1) ◽  
pp. 63-76 ◽  
Author(s):  
Michal Lavidor ◽  
Andrew W. Ellis
Keyword(s):  
Neighborhood Effects ◽  
Cerebral Hemisphere ◽  
Orthographic Neighborhood ◽  
Left Cerebral Hemisphere ◽  
The Right

Relation between Hemispheric Specialization and Gross Motor Control in Normal Right-Handed Children

1986 ◽  
Vol 63 (3) ◽  
pp. 1227-1231 ◽  
Author(s):  
Harriet Williams ◽  
Peter Werner ◽  
George Purgavie
Keyword(s):  
Cerebral Hemisphere ◽  
Hemispheric Specialization ◽  
Gross Motor ◽  
Projection System ◽  
Control Center ◽  
Left Cerebral Hemisphere ◽  
Processing Information ◽  
Hand Coordination ◽  
The Right ◽  
Abstract Shapes

The purpose of the present study was to investigate the nature of the relationship between gross-motor, eye-hand coordination and hemispheric specialization in normal right-handed children. Participants were 30 children, 75–99 mo. 15 boys and 15 girls performed a gross-motor eye-hand coordination task (a controlled, continuous one-handed ball bounce) and a test of hemispheric specialization. A backscreen tachistoscopic projection system was used to present letters and abstract shapes to left and right visual hemifields. A multivariate analysis of variance yielded a significant main effect for eye-hand coordination but not for sex. Follow-up analyses indicated that speed and accuracy of responses to verbal and spatial stimuli presented to the left cerebral hemisphere were significantly related to proficiency of eye-hand coordination. Data suggest that certain aspects of hemispheric specialization may be important to gross-motor eye-hand coordination in young children. Since the left cerebral hemisphere is the major control center for movements of the right side, the hemisphere which controls movements of a particular side may also assume the major responsibility for processing information needed to regulate those movements.

Preliminary Report: Hemispheric Relationships in Composing

1980 ◽  
Vol 162 (2) ◽  
pp. 74-95 ◽  
Author(s):  
Benjamin M. Glassner
Keyword(s):  
Cerebral Hemisphere ◽  
Preliminary Report ◽  
Traditional Instruction ◽  
Amplitude Ratios ◽  
Left Cerebral Hemisphere ◽  
Right Cerebral Hemisphere ◽  
Left And Right ◽  
The Right

The purpose of the study reported here is to examine the right/left cerebral hemisphere relationships between writing in the extensive mode and writing in the reflexive mode. Preliminary findings suggest that writing which is focused on communicating information already familiar and formulated by the writer, characteristics of extensive composing, is accompanied by greater relative engagement of the left cerebral hemisphere as indicated by lower relative EEG amplitude ratios measured from electrodes placed symmetrically over the left and right temporal areas. Writing which is focused upon discovering meanings, which is tentative and exploratory - characteristics of reflexive composing - is accompanied by greater relative engagement of the right cerebral hemisphere. Traditional instruction has failed because it is “half-brained,” addressing only one of these modes of composing.

Generalized and Lateralized Effects of Concurrent Verbalization on a Unimanual Skill

1971 ◽  
Vol 23 (3) ◽  
pp. 341-345 ◽  
Author(s):  
Marcel Kinsbourne ◽  
Jay Cook
Keyword(s):  
Motor Control ◽  
Cerebral Hemisphere ◽  
Index Finger ◽  
Left Index Finger ◽  
Distraction Effect ◽  
Left Cerebral Hemisphere ◽  
Verbal Activity ◽  
Right Hand ◽  
Concurrent Verbalization ◽  
The Right

After practice, subjects balanced a dowel rod on the right and on the left index finger while speaking and while remaining silent. As compared to control, the verbal condition yielded shorter balancing times for the right hand, but longer ones for the left. A speculative model postulates enhancement of the practised skill by virtue of the distraction effect of the concurrent activity. This is counteracted on the right by interference with right-sided motor control by the left cerebral hemisphere due to verbal activity programmed by the same hemisphere.

Recognition of Natural Expressions of Emotion by CVA Patients with Damage to the Left or Right Hemisphere

2002 ◽  
Vol 3 (1) ◽  
pp. 42-53
Author(s):  
Rebecca Bowen ◽  
Skye McDonald
Keyword(s):  
Cerebrovascular Accident ◽  
Cerebral Hemisphere ◽  
Visual Cues ◽  
Right Hemisphere ◽  
Negative Emotions ◽  
Statistical Analyses ◽  
Left Cerebral Hemisphere ◽  
Complex Stimuli ◽  
The Right

AbstractThe present study investigated the ability of cerebrovascular accident (CVA) patients to perceive emotions portrayed by realistic stimuli. Statistical analyses demonstrated that CVA patients with damage to either the right or left cerebral hemisphere performed, on average, as well as controls did in perceiving emotions. However, a case study of one patient suggested that there may be a subset of CVA patients with right parieto-occipital damage who have deficits in the perception of negative emotions. The performance of this participant also indicated that deficits in emotion perception are ameliorated to some extent when patients are provided with realistic, complex stimuli that include a range of auditory and visual cues.

Superiority of the Left Cerebral Hemisphere in Word Recognition with Nonverbal Central Fixation

1984 ◽  
Vol 59 (3) ◽  
pp. 895-898
Author(s):  
Stephen Meredith Williams
Keyword(s):  
Visual Field ◽  
Word Recognition ◽  
Cerebral Hemisphere ◽  
Right Visual Field ◽  
Left Cerebral Hemisphere ◽  
Bilateral Presentation ◽  
Fixation Task ◽  
The Right ◽  
Central Fixation

The right visual-field advantage for bilateral presentation put forward by McKeever and Huling was investigated. The central-fixation task was varied so that in one condition this task was nonverbal. Results gave some support for scanning-type explanations in this paradigm but over-all favoured Kinsbourne's activation-and-priming account.

scholarly journals Lateralized Repetition Priming for Unfamiliar Faces

2009 ◽  
Vol 56 (3) ◽  
pp. 147-155 ◽  
Author(s):  
Douglas Martin ◽  
Louise K. Nind ◽  
C. Neil Macrae
Keyword(s):  
Visual Field ◽  
Repetition Priming ◽  
Cerebral Hemisphere ◽  
Right Hemisphere ◽  
Prior Exposure ◽  
Divided Visual Field ◽  
Left Cerebral Hemisphere ◽  
Field Methodology ◽  
The Right ◽  
Unfamiliar Faces

Repetition priming (RP) is the ability to recognize a stimulus more rapidly as a result of prior exposure to the item. Recent research examining the neuroanatomical basis of this effect has demonstrated RP for familiar faces presented to the right but not to the left cerebral hemisphere. Extending this line of enquiry, the current research considered whether similar effects emerge when unfamiliar faces are the stimuli of interest. Using a divided-visual-field methodology, RP for unfamiliar faces in the left and the right hemispheres was assessed. The results revealed that RP: (i) only emerges in the right hemisphere; (ii) is evident regardless of whether the lateralized presentation of unfamiliar faces occurs at study or at test and (iii) occurs only when hair is cropped from the faces. The theoretical implications of these findings are considered.

Left-Cerebral Hemisphere Superiority in Tachistoscopic Word-Recognition Performances

1970 ◽  
Vol 30 (3) ◽  
pp. 763-766 ◽  
Author(s):  
Walter F. McKeever ◽  
Maurice D. Huling
Keyword(s):  
Word Recognition ◽  
Left Hemisphere ◽  
Cerebral Hemisphere ◽  
Right Hemisphere ◽  
Left Cerebral Hemisphere ◽  
Right Cerebral Hemisphere ◽  
Recognition Ability ◽  
Efficient Route ◽  
The Right ◽  
The Brain

Under conditions of monocular unihemispheric projection of word stimuli to the brain, 10 normal Ss uniformly showed superior word recognition ability of the left, as opposed to the right, cerebral hemisphere. Left-hemisphere recognitions were significantly more frequent than right-hemisphere recognitions for both eyes, but the extent of left-hemisphere superiority was significantly greater for the left eye. The results support the hypothesis that words projected to the right hemisphere traverse a less efficient route to the language centers of the left hemisphere.

Occlusion of Extracranial-Intracranial Bypass Anastomosis-Associated Aneurysms Following Contralateral High-Flow Extracranial-Intracranial Bypass in a Patient with Impaired Cerebrovascular Reserve

2019 ◽  
Author(s):  
Christopher J Stapleton ◽  
Peter Theiss ◽  
Gregory D Arnone ◽  
Sophia F Shakur ◽  
Fady T Charbel
Keyword(s):  
Blood Flow ◽  
Perfusion Imaging ◽  
Cerebral Hemisphere ◽  
High Flow ◽  
Collateral Blood Flow ◽  
Flow Measurements ◽  
Cerebrovascular Reserve ◽  
Left Cerebral Hemisphere ◽  
The Right

Abstract BACKGROUND AND IMPORTANCE Extracranial-intracranial (EC-IC) bypass anastomosis-associated aneurysms are rare sequelae of cerebral revascularization surgery. Although treatment paradigms are not well defined, clipping, trapping with revision bypass, and donor vessel ligation represent the most common microsurgical approaches. CLINICAL PRESENTATION A 53-yr-old male presented with cognitive decline, left extremity weakness, and left visual field blurriness. Computed tomographic angiography of head/neck demonstrated bilateral cervical internal carotid artery occlusion and magnetic resonance imaging of brain showed a small right parieto-occipital lobe infarct. The patient's symptoms worsened despite aggressive medical management. Therefore, a right superficial temporal artery to middle cerebral artery (STA-MCA) bypass was performed for flow augmentation. Follow-up digital subtraction angiography (DSA) approximately 1 yr after surgery noted 2 new aneurysms adjacent to the patent STA-MCA anastomosis. Perfusion imaging at that time showed persistently reduced blood flow in the left cerebral hemisphere. A left STA-MCA bypass was performed, and intraoperative blood flow measurements showed this to be a high-flow bypass. Follow-up DSA 4 mo later demonstrated involution of the right STA-MCA bypass and occlusion of the anastomosis-associated aneurysms with increased perfusion of the right cerebral hemisphere via collateral blood flow from the patent high-flow left STA-MCA bypass. At 7 mo following left STA-MCA bypass, the patient's neurological examination remained stable and perfusion imaging showed improved blood flow in the left cerebral hemisphere. CONCLUSION We present a unique case in which a high-flow left EC-IC bypass with robust contralateral collateral blood flow was associated with subsequent occlusion of a right EC-IC bypass and 2 anastomosis-associated aneurysms in a patient with bilateral impaired cerebrovascular reserve.

Rotation of Mental Images in Baboons When the Visual Input Is Directed to the Left Cerebral Hemisphere

1993 ◽  
Vol 4 (2) ◽  
pp. 99-103 ◽  
Author(s):  
Jacques Vauclair ◽  
Joël Fagot ◽  
William D. Hopkins
Keyword(s):  
Mental Rotation ◽  
Cerebral Hemisphere ◽  
Sample Stimulus ◽  
Mirror Image ◽  
Visual Input ◽  
Angular Deviation ◽  
Mental Images ◽  
Left Cerebral Hemisphere ◽  
The Right ◽  
Nonhuman Species

The mental rotation phenomenon was examined in baboons and humans using a video-formatted mutching-to-sample task. Sample stimuli were presented either centrally or in the right or left visual half-field. Immediately afterward, subjects had to distinguish the previously presented sample stimulus from its mirror image after both had been rotated to the same angular deviation. A mental rotation phenomenon was found in baboons and humans, but in baboons this effect was limited to conditions in which visual input was directed to the right visual half-field. These data represent the first evidence of mental rotation in a nonhuman species.

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