Fighting from the Right Side of the Brain: Left Visual Field Preference during Aggression in Free-Ranging Male Tree Lizards (Urosaurus ornatus)

2001 ◽  
Vol 58 (6) ◽  
pp. 356-361 ◽  
Author(s):  
Diana K. Hews ◽  
R. Andrew Worthington
Keyword(s):  
Visual Field ◽  
Left Visual Field ◽  
Urosaurus Ornatus ◽  
Male Tree ◽  
Tree Lizards ◽  
The Right ◽  
Free Ranging ◽  
The Brain

scholarly journals Low-frequency electroencephalogram oscillations govern left-eye lateralization during anti-predatory responses in the music frog

2020 ◽  
Vol 223 (21) ◽  
pp. jeb232637
Author(s):  
Jiangyan Shen ◽  
Ke Fang ◽  
Ping Liu ◽  
Yanzhu Fan ◽  
Jing Yang ◽  
...  
Keyword(s):  
Visual Field ◽  
Left Visual Field ◽  
Right Hemisphere ◽  
Brain Area ◽  
Power Spectra ◽  
Low Frequency ◽  
The Right ◽  
Electroencephalogram Eeg ◽  
The Brain ◽  
Steady Velocity

ABSTRACTVisual lateralization is widespread for prey and anti-predation in numerous taxa. However, it is still unknown how the brain governs this asymmetry. In this study, we conducted behavioral and electrophysiological experiments to evaluate anti-predatory behaviors and dynamic brain activities in Emei music frogs (Nidirana daunchina), to explore the potential eye bias for anti-predation and the underlying neural mechanisms. To do this, predator stimuli (a model snake head and a leaf as a control) were moved around the subjects in clockwise and anti-clockwise directions at steady velocity. We counted the number of anti-predatory responses and measured electroencephalogram (EEG) power spectra for each band and brain area (telencephalon, diencephalon and mesencephalon). Our results showed that (1) no significant eye preferences could be found for the control (leaf); however, the laterality index was significantly lower than zero when the predator stimulus was moved anti-clockwise, suggesting that left-eye advantage exists in this species for anti-predation; (2) compared with no stimulus in the visual field, the power spectra of delta and alpha bands were significantly greater when the predator stimulus was moved into the left visual field anti-clockwise; and, (3) generally, the power spectra of each band in the right-hemisphere for the left visual field were higher than those in the left counterpart. These results support that the left eye mediates the monitoring of a predator in music frogs and lower-frequency EEG oscillations govern this visual lateralization.

Lateral Asymmetry in Visual Detection under Hypnosis

1987 ◽  
Vol 65 (3) ◽  
pp. 899-906 ◽  
Author(s):  
Edward J. Hass ◽  
Christopher W. Holden
Keyword(s):  
Visual Field ◽  
Response Time ◽  
Left Visual Field ◽  
Priming Effect ◽  
Visual Detection ◽  
Dependent Measure ◽  
Right Visual Field ◽  
Lateral Asymmetry ◽  
Control Subjects ◽  
The Right

It has been suggested that the hypnotic state results in a greater relative activation or priming of the right cerebral hemisphere than of the left hemisphere. The experiment reported here employed hypnosis to produce such a priming effect in a visual-detection task. Subjects were required to detect the presence or absence of a gap in outline squares presented either to the left visual field or right visual field, with response time as the primary dependent measure. Those subjects who were hypnotized produced a 50-msec. response time difference favoring squares presented to the left visual field whereas control subjects and simulator-control subjects showed no lateral asymmetries. The result is classified as a material-nonspecific priming effect and discussed with regard to the nature of processing resources.

Visual Masking, Handedness, and Laterality

1974 ◽  
Vol 38 (3) ◽  
pp. 803-811 ◽  
Author(s):  
S. M. Luria
Keyword(s):  
Visual Field ◽  
Left Visual Field ◽  
Visual Masking ◽  
Right Visual Field ◽  
Black Disk ◽  
Left Handed ◽  
Masking Stimulus ◽  
The Right

Monocular thresholds for a black disk and for single letters, presented either alone or followed by a masking stimulus, were obtained for both eyes of 16 left-handed Ss and 16 right-handed Ss. Thresholds for the disk tended to be lower when it was presented to the right visual field, particularly for the left eye and for right-handers. Thresholds for the letters tended to be lower when presented to the right visual field of right-handers and to the left visual field of left-handers. The masking stimulus enhanced these differences for the disk but not for the letters.

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.

Effect of Lateral Eye Fixation on Cognitive Processes

1981 ◽  
Vol 52 (2) ◽  
pp. 487-490 ◽  
Author(s):  
Ronald A. La Torre ◽  
Anne-Marie La Torre
Keyword(s):  
Visual Field ◽  
Left Visual Field ◽  
Spatial Task ◽  
Right Visual Field ◽  
Control Group ◽  
Intelligence Scale ◽  
Eye Fixation ◽  
Lateral Eye ◽  
The Right ◽  
Spatial Problems

Fourth grade children responded to verbal and spatial problems drawn from the Wechsler Intelligence Scale for Children. 24 responded to verbal problems while attending to the right visual field and to spatial problems while attending to the left visual field; 24 fixed attention to the left visual field during verbal problems and to the right visual field during spatial problems. A final 24 children fixed their attention centrally while responding to both sets of problems. There were no significant differences among the groups for verbal performance. Spatial problems were dealt with least effectively during right visual-field eye-fixation. Perhaps right visual-field fixation during a spatial task leads to interference with capacity and from functional distance. Left visual-field fixation might be facilitating as a result of functional closeness but this facilitation is offset by interference with capacity making the over-all result not significantly different from that for the control group. Verbal centers may be insulated against effects of interference.

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.

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.

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