Functional Associations among Human Posterior Extrastriate Brain Regions during Object and Spatial Vision

1992 ◽  
Vol 4 (4) ◽  
pp. 311-322 ◽  
Author(s):  
Barry Horwitz ◽  
Cheryl L. Grady ◽  
James V. Haxby ◽  
Mark B. Schapiro ◽  
Stanley I. Rapoport ◽  
...  
Keyword(s):  
Left Hemisphere ◽  
Cerebral Hemisphere ◽  
Spatial Vision ◽  
Brain Regions ◽  
Matching Task ◽  
Functional Interactions ◽  
Face Matching ◽  
Right Cerebral Hemisphere ◽  
The Face ◽  
The Right

Primate extrastriate visual cortex is organized into an occipitotemporal pathway for object vision and an occipitoparietal pathway for spatial vision. Correlations between normalized regional cerebral blood flow values (regional divided by global flows), obtained using H215O and positron emission tomography, were used to examine functional associations among posterior brain regions for these two pathways in 17 young men during performance of a face matching task and a dot-location matching task. During face matching, there was a significant correlation in the right hemisphere between an extrastriate occipital region that was equally activated during both the face matching and dot-location matching tasks and a region in inferior occipitotemporal cortex that was activated more during the face matching task. The corresponding correlation in the left hemisphere was not significantly different from zero. Significant intrahemispheric correlations among posterior regions were observed more often for the right than for the left hemisphere. During dot-location matching, many significant correlations were found among posterior regions in both hemispheres, but significant correlations between specific regions in occipital and parietal cortex shown to be reliably activated during this spatial vision test were found only in the right cerebral hemisphere. These results suggest that (1) correlational analysis of normalized rCBF can detect functional interactions between components of proposed brain circuits, and (2) face and dot-location matching depend primarily on functional interactions between posterior cortical areas in the right cerebral hemisphere. At the same time, left hemisphere cerebral processing may contribute more to dot-location matching than to face matching.

Hemispheric Mechanisms Controlling Voluntary and Spontaneous Facial Expressions

1990 ◽  
Vol 2 (3) ◽  
pp. 239-245 ◽  
Author(s):  
Michael S. Gazzaniga ◽  
Charlotte S. Smylie
Keyword(s):  
Facial Expressions ◽  
Left Hemisphere ◽  
Cerebral Hemisphere ◽  
Right Hemisphere ◽  
Voluntary Movements ◽  
Optical Disc ◽  
Facial Muscles ◽  
The Face ◽  
The Right ◽  
Hemispheric Mechanisms

The capacity of each disconnected cerebral hemisphere to control a variety of facial postures was examined in three split-brain patients. The dynamics of facial posturing were analyzed in 30-msec optical disc frames that were generated off videotape recordings of each patient's response to lateralized stimuli. The results revealed that commands presented to the left hemisphere effecting postures of the lower facial muscles showed a marked asymmetry, with the right side of the face sometimes responding up to 180 msec before the left side of the face. Commands presented to the right hemisphere elicited a response only if the posture involved moving the upper facial muscles. Spontaneous postures filmed during free conversation were symmetrical. The results suggest that while either hemisphere can generate spontaneous facial expressions only the left hemisphere is efficient at generating voluntaly expressions. This contrasts sharply with the fact that both hemispheres can carry out a wide variety of other voluntary movements with the hand and foot.

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.

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.

Behavioral Lateralization during Spontaneous Smelling Tasks

2000 ◽  
Vol 90 (2) ◽  
pp. 444-450 ◽  
Author(s):  
Jean-Louis Millot ◽  
Gerard Brand
Keyword(s):  
Cerebral Hemisphere ◽  
Cerebral Asymmetry ◽  
Right Cerebral Hemisphere ◽  
Significant Difference ◽  
The Right

The smelling behavior of 52 right-handed subjects was videotaped during tasks involving identification and recognition of different odors. Analysis showed that men more often used the right nostril than the left whatever the odor. There was no significant difference for the women. These results support a more marked cerebral asymmetry in men than in women and a main involvement of the right cerebral hemisphere in the olfactory processes at least by right-handed men.

scholarly journals Studies on semantic priming effects in right hemisphere stroke: A systematic review

2013 ◽  
Vol 7 (2) ◽  
pp. 155-163
Author(s):  
Juliana de Lima Müller ◽  
Jerusa Fumagalli de Salles
Keyword(s):  
Systematic Review ◽  
Semantic Priming ◽  
Cerebral Hemisphere ◽  
Semantic Processing ◽  
Right Hemisphere ◽  
Priming Effects ◽  
Right Cerebral Hemisphere ◽  
The Right ◽  
Right Hemisphere Stroke

ABSTRACT The role of the right cerebral hemisphere (RH) associated with semantic priming effects (SPEs) must be better understood, since the consequences of RH damage on SPE are not yet well established. Objective: The aim of this article was to investigate studies analyzing SPEs in patients affected by stroke in the RH through a systematic review, verifying whether there are deficits in SPEs, and whether performance varies depending on the type of semantic processing evaluated or stimulus in the task. Methods: A search was conducted on the LILACS, PUBMED and PSYCINFO databases. Results: Out of the initial 27 studies identified, 11 remained in the review. Difficulties in SPEs were shown in five studies. Performance does not seem to vary depending on the type of processing, but on the type of stimulus used. Conclusion: This ability should be evaluated in individuals that have suffered a stroke in the RH in order to provide treatments that will contribute to their recovery.

scholarly journals A Crossed Kana Agraphia

1995 ◽  
Vol 8 (2) ◽  
pp. 121-124
Author(s):  
K. Abe ◽  
R. Yokoyama ◽  
T. Yanagihara
Keyword(s):  
Cerebral Hemisphere ◽  
Superior Temporal Gyrus ◽  
Language Function ◽  
Reading And Writing ◽  
Right Cerebral Hemisphere ◽  
Wernicke’S Area ◽  
The Right ◽  
Target Words

We report a right-handed man who developed selective Kana (phonogram) agraphia following an infarct in the non-dominant right cerebral hemisphere. His ability for comprehension, reading and writing of Kanji (ideogram) was unaffected. Kana errors consisted of substitution with another letter and the number of target words was well preserved. The lesion responsible for his Kana agraphia included the right Wernicke's area (the posterior one-third or one-half of the superior temporal gyrus) on MRI, but he did not have aphasia. Based on these findings, we conclude that the language function in some dextral people may be partially lateralized to the right cerebral hemisphere.

Effect of Visual Complexity in Identification of Tachistoscopic Images

1994 ◽  
Vol 78 (3) ◽  
pp. 971-978 ◽  
Author(s):  
Robert Geheb ◽  
Keith E. Whitfield ◽  
Linda Brannon
Keyword(s):  
Reaction Time ◽  
Left Hemisphere ◽  
Right Hemisphere ◽  
Visual Complexity ◽  
Reaction Times ◽  
Right Cerebral Hemisphere ◽  
The Mean ◽  
The Times ◽  
The Right ◽  
Mean Reaction Time

The present study of gender differences in hemispheric processing involved identification of tachistoscopically presented images of varying complexity. A computerized tachistoscopic program was administered to 24 men and 34 women. Time to identify contour and detailed pictures presented to the left or right cerebral hemisphere was recorded. Mean reaction time for contour pictures was significantly faster than for detailed pictures, and mean reaction time to the right hemisphere was significantly faster than that to the left hemisphere. The mean reaction time for men to identify pictures exposed to the left hemisphere was significantly slower than that for exposure to the right hemisphere for women. The mean reaction time for both men and women to identify contour pictures exposed to the right hemisphere was significantly faster than the mean time to identify detailed pictures presented to the left hemisphere. The interaction of gender, hemisphere, and complexity was also significant in that mean reaction times for men to identify detailed pictures presented to the left hemisphere were slower than the times for women to identify contour pictures presented to the right hemisphere. The results are discussed in relation to theories about hemispheres, gender, and differences in picture features.

Cartographic training for bachelors of tourism in the context of professional competence

2016 ◽  
Vol 10 (2) ◽  
pp. 4-11
Author(s):  
Татьяна Комиссарова ◽  
Tatyana Komissarova ◽  
Елена Гаджиева ◽  
Elena Gadzhieva
Keyword(s):  
Cerebral Hemisphere ◽  
Figurative Language ◽  
Professional Competence ◽  
Professional Skills ◽  
Geographic Space ◽  
Right Cerebral Hemisphere ◽  
Regional Project ◽  
Intermediate Element ◽  
The Right

The article theoretically and practically substantiates the necessity of teaching Mapping for Bachelors of Tourism. The cartographic competence of future professionals is closely connected with their professional skills. The specific feature of the cartographic method is that it allows one to visualize the geographic space or any simulated space for studying. Consequently it develops the student’s spatial thinking, and makes both cerebral hemispheres be active. It is known that the right cerebral hemisphere is responsible for the creative feature of the human nature, and the left cerebral hemisphere is responsible for the logic. The essence of the cartographic method is that in the process of researching the reality an intermediate element appears. And the intermediate element is a map the role of which is of two kinds: it is a research tool and the subject of research presented as a model, a prototype of the reality at the same time. The symbolic figurative language of a map develops the abstract thinking about the real prototype. It should be emphasized that maps help specialists to establish new patterns in location and interconnection of phenomena. Understanding of the graphic image of the structure of the geographical space, highlighting the peculiarities of the tourist and recreational component, administrating the tourist and recreational space, designing a regional project for the development of tourism, creating package tours – all these professional skills are immediately related to students’ intellectual-graphic activities, to their abilities to visualize the geospace, to be good at Mapping. In the final part of the article the cartographic competence is defined as an element of the culture of a competent specialist in tourism’s personality.

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