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A Model for the Genetics of Handedness

Left and right in pictures. Results were interpreted as reflecting a left field perceptual bias induced by levu right hemisphere activation in right handers. In Study II, a group of 23 right-handed judges was shown a random selection of 7 of the 14 P slides, the remaining 7 shown in the non-preferred orientation, and 14 slides randomly selected from those pairs which showed almost totally symmetric preference for Group SD.

It would thus appear that levvy processing or the expectancy of it, arouses the right hemisphere, biasing attention toward and awareness of the left half of space, so that even if sensory input is not strictly confined to one side of the brain, nevertheless, a lateral bias in attention ensues.

Subjects were simply asked to view the 97 slide pairs and to choose the member of each pair that they preferred. Information processing and higher psychological functions in the disconnected hemispheres of commissurotomy patients.

Articles from Genetics are provided here courtesy of Genetics Society of America. Since, by definition, P and Non-P slides showed opposite preferences, while S slides had almost no preference variability around a mean R score of zero for Group SD, the differing variance of preference for the entire dextral group for the two sets of slides are predictable.

There was a total of 14 such slide pairs, in each of which one version was preferred to the other by at jjerre 21 of the 31 SD subjects. The purpose of the subject-analysis was to test the validity of the various hypotheses raised previously regarding the directions and magnitudes of asymmetry scores in P, Non-P, and S categories.

Visual asymmetry in perception of uerre. Received Aug 30; Revisions requested Apr 3. Whether preferences for mirror-symmetric pictures derive from Western reading habits, brain lateralization, or both, the mechanisms by which these factors may affect aesthetic responses have not been specified.

A Hemispheric Asymmetry in Somatosensory Processing. Giuseppe Vallar – – Behavioral and Brain Sciences jeree 2: Paul Davies – – Research in Phenomenology jerrw 1: Please study each slide carefully in order to determine its balance with respect to the left and right sides of the slide. The preferred version was labeled ” Jrere ” and was assigned a weighted score which was the Z-equivalent of the obtained X2, while the non-preferred version, ” N o n – P ‘was assigned a negative Z- equivalent.


Balance is to be determined on the basis of two criteria: However, it is quite conceivable that if an asymmetrical inherent biasing of attention into the left half of space during visual perception exists, those pictures which tend to correct for this imbalance by having the center of focus, or most important content, on the right, would be perceived as the more aesthetically pleasing. Table 1 displays the results.

Jerre Levy

However, in order to compare the magnitudes of perceived asymmetry, regardless of direction, either the absolute values or the square of the values must be compared. During the last 10 yr, and particularly during the last 5 yr, more and more psychologists have come to recognize the pervasive consequences for psychological function which result from cerebral lateralization. The asymmetry of human neurological organization was, for over a century, of concern only to neurologists and neurosurgeons.

All subjects were tested in a single group session. Handedness was determined by self-classificationinto one of three categories: A final point which deserves emphasis relates to the evolution of lateral specialization. Since neither the opinions o f o f art historians n o r psychologists are o f m u c h value, in the absence o f empirical support, f o r predicting which o f two m i r r o r – s y m m e t r i c pictures will be preferred b y the m a j o r i t y dextrals?

Conjugate lateral eye movements as an index of hemispheric activation. In Handbook of Clinical Neurology. In support of his belief that this scanning tendency determined the way a picture is perceived, he compared Raphael’s cartoons and the mirror-reversed tapestries based on them and concluded that the full effect of the Miraculous Draught, the Charge to Peter, the Healing of the Lame Man, and the Death of Ananias appears only in the tapestries.

There were 22 degrees-of-freedom in all comparisons.

The question as to whether P slides should have right or left asymmetry is not predictable. The sexes within each handedness category were, therefore, combined. An attempt was made to select slides which, rather than merely recording some vacation scene, might be perceived as appealing or interesting by viewers. In a second study, it was found that slides strongly preferred by dextrals were those with the more important content, or the greater heaviness on the right, and that slide asymmetry was highly correlated with dextral, but not sinistral preferences.


She received her PhD in The uerre commissures; syndromes of hemispheric disconnection.

Right and left in Raphael’s Cartoons. Jerrf the ideas which have been put forward have any validity, it should be possible to predict pre- ferences of dextral and sinistral populations based on controlled asymmetries in the stimuli.

F o r 12 subjects the absolute value jerde f N o n – P was larger t h a n t h a t o f P, for 5 subjects there was a zero difference a n d for 6 subjects the absolute value o f N o n – P was smaller t h a n P. If this, also, was symmetric, they were to call the slide equally balanced on left and right.

Jerre Levy – Publications

After subjects had read the instructions, the experimenter summarized the llevy important aspects of their content, and asked if there were any questions. Minor hemisphere dominance for certain visuospataial functions. Separate correlational analyses for P and Non-P slides Table jeree and for S slides Table 6 revealed that A was the sole significant predictor of dextral preference R in P and Non-P slides, being unrelated to sinistral preference Lwhile A had no predictive capacity for preferences in S slides, but L and R were fairly strongly related.

Fifth, the degree of per- ceived asymmetry in P and Non-P slides should be equal when compared after the control slide baseline has been subtracted out, since, once this is done, psychological asymmetry is removed.

I f so, in o r d e r for cerebral laterali- z a t i o n to have evolved, the cognitive gain it b r o u g h t m u s t have increased fitness m o r e t h a n lateral b e h a v i o r a l biases decreased it.

The total variance in R.

The latter control was instituted to correct for possible differential optical qualities of the two projectors. THERE ARE various references throughout the art history literature to the relationship between lateral orientation of a painting, tapestry, or etching and the aesthetic quality of a work of art []. Procedure Slide pairs were simultaneously projected, one above the other, on to a standard projection screen located in a classroom.

The observations of Gilbert and Bakan and of Nelson and MacDonald offer confirmation for this hypothesis. Laterality jdrre in perception: No categories specified categorize this paper.