Role of Interstimulus and Stimulus-Hemisphere Compatibility in the Process of Interhemispheric Integration

1988 ◽  
Vol 67 (2) ◽  
pp. 503-512 ◽  
Author(s):  
Jean-Marc Berger ◽  
Etienne Perret ◽  
Annemarie Zimmermann
Keyword(s):  
Visual Field ◽  
Left Hemisphere ◽  
Normal Subjects ◽  
Right Visual Field ◽  
Pictorial Representation ◽  
Compatibility Analysis ◽  
Compound Nouns ◽  
The Right

Normal subjects had to name German compound nouns which were presented tachistoscopically. The compound nouns were displayed either unilaterally to the left or right visual field, or bilaterally with one element to the left and one to the right visual field. A distinction was made between the bilateral conditions as to whether the representation of the elements, printed and/or pictorial, included a high or low interstimulus and a high or low stimulus-hemisphere compatibility. Analysis indicated firstly a superiority of the left hemisphere for the naming of compound nouns in mixed print and pictorial representation. Secondly, the performance in the bilateral conditions was moderated by stimulus-hemisphere compatibility. In the process of interhemispheric integration stimulus-hemisphere compatibility proved more crucial than interstimulus compatibility. Analyses of errors further illustrated hemispheric behaviour.

Interhemispheric Integration of Compound Nouns: Effects of Stimulus Arrangement and Mode of Presentation

1987 ◽  
Vol 65 (2) ◽  
pp. 663-671 ◽  
Author(s):  
Jean-Marc Berger ◽  
Etienne Perret ◽  
Annemarie Zimmermann
Keyword(s):  
Visual Field ◽  
Normal Subjects ◽  
Right Visual Field ◽  
Pictorial Representation ◽  
Reading Habits ◽  
Mode Of Presentation ◽  
Compound Nouns ◽  
Bilateral Condition ◽  
Stimulus Arrangement ◽  
Visual Field Superiority

Normal subjects had to name German compound nouns which were presented tachistoscopically. The compound nouns were displayed either unilaterally to the left or right visual field or bilaterally with one element to each visual field. In the bilateral condition a distinction was made as to whether familiar or unfamiliar arrangement of the elements was used. Representation in print was compared with pictorial representation of the compound nouns. A right visual-field superiority was observed with printed representation, but no laterality effects with pictorial representation. Bilateral processing was superior to unilateral processing. Within the bilateral conditions, the familiar arrangement of the elements yielded a significantly better performance than unfamiliar arrangement. This difference can be explained by reading habits and/or by different styles of interhemispheric integration.

Asynchrony of Lateral Onset as a Factor in Difference in Visual Field

1976 ◽  
Vol 42 (1) ◽  
pp. 163-166 ◽  
Author(s):  
Takeshi Hatta
Keyword(s):  
Visual Field ◽  
Left Hemisphere ◽  
Left Visual Field ◽  
Right Visual Field ◽  
Perceptual Process ◽  
Experimental Conditions ◽  
Stimulus Interval ◽  
Laterality Effect ◽  
The Right

An experiment in matching judgments was designed to examine a role of perceptual process in apparent asymmetry. Recognition of Hirakana letters (Japanese letters) was required. The experimental condition in which stimuli were presented to the left visual field first and to the right visual field second produced more errors for all stimulus intervals (0 to 60 msec.) than experimental conditions where stimuli were presented to the right visual field first and to the left one second. Especially, superiority of the latter condition was marked with the longest stimulus interval employed. These results indicate superiority of the left hemisphere function for recognizing Hirakana letters and suggest that not only memory but also perceptual process contributes to this laterality effect.

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.

Critique of Heron's Directional-Reading Conflict Theory of Scanning

1969 ◽  
Vol 29 (1) ◽  
pp. 271-276 ◽  
Author(s):  
Robert Fudin
Keyword(s):  
Visual Field ◽  
Eye Movement ◽  
Left Visual Field ◽  
Critical Evaluation ◽  
Slight Modification ◽  
Conflict Theory ◽  
Right Visual Field ◽  
The Right ◽  
The Way

Heron (1957) proposed a theory of scanning of tachistoscopically presented alphabetical stimuli. It provided a unifying framework to interpret the disparate results obtained when a target is exposed such that half of it is in the left visual field and half in the right visual field, and when arrays are presented laterally, i.e., either in the right or left field. The theory basically holds that eye-movement tendencies established through reading are also operative in covert scanning because tachistoscopically exposed material is encoded in a manner similar to the way it is read. This paper accepts this position but offers a critical evaluation of Heron's ideas as to the manner in which these tendencies function. This discussion and a reexamination of the role of these tendencies in reading lead to the conclusion that they operate sequentially, not simultaneously, as Heron contended. A slight modification in Heron's theory is offered in light of this conclusion.

Right Hemisphere Memory Bias Does Not Extend to Involuntary Memories for Negative Scenes

Perception ◽  
2021 ◽  
Vol 50 (1) ◽  
pp. 27-38
Author(s):  
Ella K. Moeck ◽  
Nicole A. Thomas ◽  
Melanie K. T. Takarangi
Keyword(s):  
Visual Field ◽  
Left Hemisphere ◽  
Right Hemisphere ◽  
Visual Fields ◽  
Memory Bias ◽  
Right Visual Field ◽  
Hemispheric Differences ◽  
Involuntary Memory ◽  
Involuntary Memories ◽  
The Right

Attention is unequally distributed across the visual field. Due to greater right than left hemisphere activation for visuospatial attention, people attend slightly more to the left than the right side. As a result, people voluntarily remember visual stimuli better when it first appears in the left than the right visual field. But does this effect—termed a right hemisphere memory bias—also enhance involuntary memory? We manipulated the presentation location of 100 highly negative images (chosen to increase the likelihood that participants would experience any involuntary memories) in three conditions: predominantly leftward (right hemisphere bias), predominantly rightward (left hemisphere bias), or equally in both visual fields (bilateral). We measured subsequent involuntary memories immediately and for 3 days after encoding. Contrary to predictions, biased hemispheric processing did not affect short- or long-term involuntary memory frequency or duration. Future research should measure hemispheric differences at retrieval, rather than just encoding.

Functional Hemispheric Asymmetry and Belief in ESP: Towards a “Neuropsychology of Belief”

1993 ◽  
Vol 77 (3_suppl) ◽  
pp. 1299-1308 ◽  
Author(s):  
Peter Brugger ◽  
Alex Gamma ◽  
René Muri ◽  
Markus Schafer ◽  
Kirsten I. Taylor
Keyword(s):  
Visual Field ◽  
Lexical Decision ◽  
Left Hemisphere ◽  
Hemispheric Asymmetry ◽  
Right Hemisphere ◽  
Right Visual Field ◽  
Decision Task ◽  
Verbal Tasks ◽  
Hemisphere Dominance ◽  
The Right

30 right-handed subjects were given a lateralized tachistoscopic lexical-decision task. Subjects' belief in extrasensory perception (ESP) was assessed with a single six-point scale; 16 subjects were designated as believers in ESP and 14 subjects as nonbelievers. Believers in ESP did not exhibit a hemispheric asymmetry for the task while nonbelievers exhibited the expected right visual-field/left-hemisphere dominance documented in the literature. Believers' lack of asymmetry was not caused by an impaired left-hemisphere performance but rather by a significantly enhanced lexical-decision accuracy in the left visual field/right hemisphere compared to nonbelievers. These results are compatible with previous studies indicating a correlation between belief in ESP and a bias for right-hemisphere processing. Moreover, the results are relevant for a discussion of an association between paranormal beliefs and schizotypy: highly schizotypal individuals are not only particularly prone to believe in ESP but are also known to show an attenuation of hemispheric asymmetries in lateralized verbal tasks due to an enhanced contribution of the right hemisphere. We suggest that the neurological basis of delusion-like beliefs may involve a release of right-hemisphere function from left-hemisphere control and sketch the focus of research for a future “neuropsychology of belief.”

Visual-Field Asymmetries in Letter Recognition: Evidence for Asymmetry in Early Visual Registration

1979 ◽  
Vol 49 (1) ◽  
pp. 183-191
Author(s):  
Colin Pitblado ◽  
Michael Petrides ◽  
Gary Riccio
Keyword(s):  
Visual Field ◽  
Recognition Accuracy ◽  
Visual Fields ◽  
Normal Subjects ◽  
Letter Recognition ◽  
Right Visual Field ◽  
Cerebral Asymmetry ◽  
Exposure Field ◽  
The Right

Two experiments on visual-field differences in tachistoscopic letter recognition are described. In the first, a bright pre-exposure field with a black fixation point was used, and the conventionally expected dominance of the right visual field was found. However, a large number of “blank” trials were observed, in which subjects completely failed to detect the presence of the flashed target. These “blanks” were themselves significantly asymmetric between visual fields, suggesting that asymmetry in early stimulus registration may play an unsuspected role in typical measures of cerebral asymmetry in recognition accuracy. This was confirmed in a second experiment in which use of dark pre-exposure fields eliminated “blanks” and led to higher over-all accuracy, with no visual-field differences. Implications for interpretation of laterality data with normal subjects are discussed.

Attention and Hemispheric Differences in Reaction Time during Simultaneous Audio-Visual Tasks

1973 ◽  
Vol 25 (3) ◽  
pp. 404-412 ◽  
Author(s):  
Gina Geffen ◽  
J. L. Bradshaw ◽  
N. C. Nettleton
Keyword(s):  
Reaction Time ◽  
Visual Field ◽  
Right Hemisphere ◽  
Visual Fields ◽  
Normal Subjects ◽  
Auditory Task ◽  
Right Visual Field ◽  
Hemispheric Differences ◽  
Language Functions ◽  
The Right

The effect of different types of competing auditory tasks on laterality differences in visual perception was investigated. Right-handed subjects were presented with digits which occurred randomly in the left or right visual fields. They responded vocally to previously specified digits in a go, no-go reaction time situation. In the absence of any competing auditory task, digits presented in the right visual field were processed more quickly. This visual field difference in reaction time was in the same direction while subjects performed a secondary musical task. However, when a secondary verbal task had to be performed, digits in the left visual field received faster responses. The results support the view that the right hemisphere is capable of some language functions, and that hemispheric differences in performance have at their basis a quantitative asymmetry, which can be reversed even in normal subjects by overloading their limited capacity.

scholarly journals Hemifield-Specific Rotational Biases during the Observation of Ambiguous Human Silhouettes

Symmetry ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1349
Author(s):  
Chiara Lucafò ◽  
Daniele Marzoli ◽  
Caterina Padulo ◽  
Stefano Troiano ◽  
Lucia Pelosi Zazzerini ◽  
...  
Keyword(s):  
Visual Field ◽  
Confounding Factor ◽  
Visual Representations ◽  
Right Visual Field ◽  
Implicit Representation ◽  
Motor Processes ◽  
Ambiguous Stimuli ◽  
The Right ◽  
Motor Representations

Both static and dynamic ambiguous stimuli representing human bodies that perform unimanual or unipedal movements are usually interpreted as right-limbed rather than left-limbed, suggesting that human observers attend to the right side of others more than the left one. Moreover, such a bias is stronger when static human silhouettes are presented in the RVF (right visual field) than in the LVF (left visual field), which might represent a particular instance of embodiment. On the other hand, hemispheric-specific rotational biases, combined with the well-known bias to perceive forward-facing figures, could represent a confounding factor when accounting for such findings. Therefore, we investigated whether the lateralized presentation of an ambiguous rotating human body would affect its perceived handedness/footedness (implying a role of motor representations), its perceived spinning direction (implying a role of visual representations), or both. To this aim, we required participants to indicate the perceived spinning direction (which also unveils the perceived handedness/footedness) of ambiguous stimuli depicting humans with an arm or a leg outstretched. Results indicated that the lateralized presentation of the stimuli affected both their perceived limb laterality (a larger number of figures being interpreted as right-limbed in the RVF than in the LVF) and their perceived spinning direction (a larger number of figures being interpreted as spinning clockwise in the LVF than in the RVF). However, the hemifield of presentation showed a larger effect size on the perceived spinning direction than on the perceived limb laterality. Therefore, as we already proposed, the implicit representation of others’ handedness seems to be affected more by visual than by motor processes during the perception of ambiguous human silhouettes.

Cognitive Arithmetic: Evidence for Right Hemispheric Mediation in an Elementary Component Stage

1980 ◽  
Vol 32 (1) ◽  
pp. 69-84 ◽  
Author(s):  
Albert N. Katz
Keyword(s):  
Visual Field ◽  
Left Hemisphere ◽  
Right Hemisphere ◽  
Reaction Times ◽  
Right Visual Field ◽  
Spatial Order ◽  
Elementary Component ◽  
Cognitive Arithmetic ◽  
The Right ◽  
Field Errors

Earlier studies involving the lateralization of arithmetic abilities have provided evidence for both right and left hemisphere superiorities. It is argued here that part of this inconsistency could be due to the complexity of the arithmetic computations which have been examined. The present studies examined a subprocess shown to be involved in more complex tasks, such as subtraction. The subprocess is the identification of which of two numbers is greater, and was tested by the flashing of a pair of digits to either the left or right visual field. Errors, reaction-times to make a decision, and examination of hand × visual field interactions all indicated that this subprocess is mediated by the right hemisphere. Correlational analysis was used to identify the operations underlying the observed lateralization of this ability. This analysis indicated that an operation indexed by the spatial order in which the digits were presented was effective in the right hemisphere but not the left hemisphere. Speculations on the nature of these operations were presented.

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