Visual Field Sensitivity on a Two-Choice Discrimination Task

1981 ◽  
Vol 53 (1) ◽  
pp. 91-100 ◽  
Author(s):  
Paul Salmon ◽  
Albert Rodwan
Keyword(s):  
Visual Field ◽  
Signal Detection ◽  
Left Visual Field ◽  
Discrimination Task ◽  
Visual Fields ◽  
Detection Analysis ◽  
Field Sensitivity ◽  
Signal Detection Analysis ◽  
The Right ◽  
Stimulation Of

A signal-detection analysis was used to evaluate visual-field sensitivity on a two-choice (same/different) discrimination task. Pairs of unfamiliar geometrical forms were presented tachistoscopically to the right or left visual fields of 12 subjects. Of 12 subjects 11 obtained left visual-field values which exceeded those of the right. The data suggested that the superiority of stimulation of the left visual field resulted from greater sensitivity to “same” figure pairs.

Hemispheric Asymmetries for Temporal Resolution: A Signal Detection Analysis of Threshold and Bias

1994 ◽  
Vol 47 (2) ◽  
pp. 291-310 ◽  
Author(s):  
Michael E. R. Nicholls
Keyword(s):  
Visual Field ◽  
Signal Detection ◽  
Left Hemisphere ◽  
Right Hemisphere ◽  
Right Visual Field ◽  
Hemispheric Asymmetries ◽  
Detection Analysis ◽  
Signal Detection Analysis ◽  
Temporal Events ◽  
The Right

Divided visual field techniques were used to investigate hemispheric asymmetries for (a) the threshold of fusion of two flashes of light and (b) the detection of simultaneous versus successive events for a group of normal, right-handed adults. A signal detection analysis revealed a higher level of accuracy for the right visual field-left hemisphere (RVF-LH) relative to the left visual field-right hemisphere (LVF-RH) for both tasks. These results were interpreted in terms of a general left-hemisphere advantage for the discrimination of fine temporal events. The implications of these results for models of temporary asymmetry that describe the left hemisphere's advantage in terms of an exclusive specialization or relative superiority are then discussed.

Effect of Learning on Hemispheric Dominance and Free Recall in a Single Subject

1972 ◽  
Vol 31 (1) ◽  
pp. 227-230 ◽  
Author(s):  
Lester C. Shine ◽  
Joseph Wiant ◽  
Frank Da Polito
Keyword(s):  
Free Recall ◽  
Visual Field ◽  
Analysis Of Variance ◽  
Field Condition ◽  
Left Visual Field ◽  
Visual Fields ◽  
Hemispheric Dominance ◽  
Right Visual Field ◽  
Single Subject ◽  
The Right

This experiment was designed to investigate the effect of learning on the free recall of letters presented tachistoscopically either to the left visual field, the right visual field, or identically and simultaneously to both visual fields. A modified Shine-Bower analysis of variance was used to analyze S's performance. The results indicate that initially, in accord with previous research, the right visual field is superior to the left visual field in performance, but that this superiority tends to reduce across trials and practically disappears in the later trials. Also, the right visual field condition is not appreciably better in performance than the condition with both visual fields.

scholarly journals Single-Case Neuropsychological Assessment of a Patient with a Posterior Parietal Lesion Using Behavioral Testing and Resting-State fMRI

2021 ◽  
Vol 05 (03) ◽  
pp. 1-1
Author(s):  
Elisa Martín-Arévalo ◽  
◽  
Carole Guedj ◽  
François Cotton ◽  
Gilles Rode ◽  
...  
Keyword(s):  
Visual Field ◽  
Functional Connectivity ◽  
Resting State ◽  
Left Visual Field ◽  
Single Case ◽  
Visual Fields ◽  
Resting State Fmri ◽  
Occipital Area ◽  
Posterior Parietal ◽  
The Right

This study integrated functional connectivity measures using resting-state fMRI and behavioral data from a single-case observation of patient (PER) one year after right-hemispheric hemorrhage in the intraparietal sulcus and superior parietal lobule (IPS/SPL). PER showed no sign of clinical neglect. Her behavioral performance in the visuo-manual pointing task and in the letter discrimination task under conditions of endogenous and exogenous attentional cueing was compared between the left (affected) and right (unaffected/control) peripheral visual fields. The resting-state fMRI demonstrated an imbalance between the right and left hemispheric frontoparietal functional connectivity within the dorsal attentional and motor networks. Although the frontal and occipital cortices were not structurally damaged, specific fronto-occipital functional connectivity was imbalanced, which was strongly associated with the behavioral changes. First, the activity in the right frontal eye field showed weaker correlations with the activity in the right inferior occipital area compared to the correlation with the activity in the left inferior occipital area. This imbalanced fronto-occipital functional connectivity was accompanied by a specific impairment in endogenous covert attention in the left visual field. Second, the activity within M1 in both hemispheres showed weaker correlations with the activity of the right cuneus compared to the correlation with the activity in the left cuneus. The imbalanced fronto-occipital functional connectivity was associated with the impairment of the reaching movement of the left and right hands towards the left visual field (optic ataxia). Altogether, our results showed that a lesion to the posterior parietal cortex affects the relationship between distal regions underlying the sensorimotor and attentional abilities

Recognition of Alphabetical Arrays Presented in the Right and Left Visual Fields

1969 ◽  
Vol 29 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Robert Fudin
Keyword(s):  
Visual Field ◽  
Left Visual Field ◽  
Visual Fields ◽  
Stimulus Presentation ◽  
Right Visual Field ◽  
Cell Assembly ◽  
A Cell ◽  
Experimental Findings ◽  
The Right ◽  
Central Fixation

Six-letter nonsense arrays were tachistoscopically presented successively in the right visual field (RVF) and left visual field (LVF) at four different displacements from a central fixation point (FP) to 20 Ss. Recognition scores were significantly greater for material exposed in the RVF at each of the first three displacements and for the average of all displacements. In each case the higher recognition score for stimuli in the RVF was limited to letters located in the left-array half (letters 1, 2 and 3). An investigation into the dynamics of scanning indicated that these three letters are more advantageously situated when presented in the RVF. This methodological inconsistency brings into question the use of the results obtained from the successive mode of stimulus presentation as evidence for Hebb's notion of a cell assembly. Several ideas concerning the dynamics of scanning which emerged from the experimental findings were discussed.

Perception of Geometrical Arrays Tachistoscopically Exposed in Right and Left Visual Fields

1975 ◽  
Vol 40 (3) ◽  
pp. 831-834 ◽  
Author(s):  
Robert Fudin ◽  
Darryl B. Feldman
Keyword(s):  
Visual Field ◽  
Left Visual Field ◽  
Visual Fields ◽  
Physiological Mechanism ◽  
Right Visual Field ◽  
Extensive Experience ◽  
The Difference ◽  
The One ◽  
The Right ◽  
Left Movement

Geometrical stimuli (48 6-item arrays of familiar forms, e.g., circle), tachistoscopically presented in the right or left visual field, were more accurately perceived in the right than left visual field by 15 college students. Targets about half the length of the displays exposed here were perceived with equal facility in both visual fields (Bryden, 1960). Results suggest that length of array might affect the difference in perceptual accuracy of forms shown in the right and left visual fields. Figures in the right visual field were predominantly processed from left to right, and forms in the left visual field from right to left. Since more symbols were identified in the right than left visual field, the left to right encoding sequence may be more efficient than a right to left movement. Limited experience of most Ss in reading symbols from left to right is probably only one factor. Extensive experience reading alphabetical material from left to right might have developed the physiological mechanism underpinning this sequence more than the one serving the opposite movement.

Differential Recognition of Tachistoscopically Presented English and Hebrew Words in Right and Left Visual Fields

1965 ◽  
Vol 21 (2) ◽  
pp. 431-437 ◽  
Author(s):  
Melvin I. Barton ◽  
Harold Goodglass ◽  
Amnon Shai
Keyword(s):  
Visual Field ◽  
Cerebral Hemisphere ◽  
Left Visual Field ◽  
Visual Fields ◽  
Cerebral Dominance ◽  
Consistent Finding ◽  
Differential Recognition ◽  
The Right ◽  
Language Areas

In this study, the role of lateral cerebral dominance in the consistent finding of lower tachistoscopic thresholds in the right than in the left visual field for alphabetic material was tested for readers of Hebrew and English. Twenty Israeli Ss were presented with Hebrew and English three-letter words, printed vertically, through a monocular tachistoscope, displaced to left or right of fixation by 2°21′. Ten American Ss were also tested for three-letter English words, under similar conditions. Significantly lower thresholds in the right field were found for both groups and for both languages, despite the fact that Hebrew, unlike English, is read from right to left. These findings tend to support the hypothesis that alphabetic stimuli arriving in the major cerebral hemisphere are more readily recognized than similar stimuli arriving in the hemisphere contralateral to the language areas.

Hemispheric Asymmetry in Reaction Time to Color Stimuli

1977 ◽  
Vol 45 (3_suppl) ◽  
pp. 1151-1155 ◽  
Author(s):  
M. Pirot ◽  
T. W. Pulton ◽  
L. W. Sutker
Keyword(s):  
Reaction Time ◽  
Visual Field ◽  
Left Visual Field ◽  
Hemispheric Asymmetry ◽  
Visual Fields ◽  
Left Hand ◽  
Simple Detection ◽  
Color Field ◽  
The Right ◽  
Male Subjects

The simple detection of colored stimuli in the right, center, and left visual fields was examined. 10 male subjects were used in a reaction time paradigm with color (red, green, or blue), field, and hand as independent variables. A significantly faster RT to stimuli presented in the left visual field was observed, and further the left visual field-left hand combination was the fastest of all the combinations of visual-field × hand. A significant interaction of color × field suggested that red may be processed on a higher order level even in a simple detection task.

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