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First, both P and Non-P pictures should be perceived as significantly more asymmetric than the control slides which had elicited no preference asymmetry.

After subjects had read the instructions, the experimenter summarized the most important aspects of their content, and asked if there were any questions. Please study each slide carefully in order to determine its balance with respect to the left and right sides of the slide.

Results were interpreted as reflecting a left field perceptual bias induced by selective right hemisphere activation in right handers. Stein – – Behavioral and Brain Sciences 29 3: Thus, for any subject, a positive score indicated that his preference was similar to that for Group SD, a negative score indicated the opposite preference, and a score of zero indicated no relationship with the preferences of Group SD.

Psychobiological implications of bilateral asymmetry

Conjugate lateral eye movements as an index of hemispheric activation. Two separate analyses of the data were per- formed. KINSBOtmNE[24] confirmed, as Trevarthen suggested, that processing of information in the left or right side of space is enhanced when the contralateral hemisphere is selectively activated by laterally specialized thinking.

In Handbook of Clinical Neurology. An attempt was made to select slides which, rather than merely recording some vacation scene, might be perceived as appealing or interesting by viewers. Future investigations, directed toward understanding of the factors affecting preference for mirror-symmetric pairs of pictures, could profitably utilize specially designed stimuli in which heaviness, location of important content, and movement are all controlled.

From Wikipedia, the free encyclopedia. Paula Tallal – – Behavioral and Brain Sciences 4 1: Articles from Genetics are provided here courtesy of Genetics Society of America. In one, average P, Non-P, and S asymmetry scores were determined for each subject, averaging over slides in each category, and in the other, average asymmetry scores were determined for each slide, averaging over subjects. Third, there should be a slight perceived left asymmetry in the control slides due to a left field bias of attention, found by other investigators to occur during visual processing.


History of Western Philosophy. Please review our privacy policy. It should be noted, however, that the mean score of Group SD 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.

The total variance in R. Science, It may be that those pictures in which movement or implied or potential movement is present are preferred when the movement is from left to right.

Jerre Levy

Slide analysis Simple, partial, and multiple correlations were computed for the A, R, and L scores of the 28 slides. 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. If this, also, was symmetric, they were to call the slide equally balanced on left and right.

Brain 95, Apparently, however, the net preferences manifested, although weak, were, to the extent they were predictable, almost entirely due to the same factor which controlled sinistral preferences. Skills 33, Each slide was then projected for 15 sec on to a standard projection screen located in a classroom, followed immediately by the next slide in the sequence, with subjects usually marking their answer sheets during the last 5 see of each projection.

Distribution of negative and positive scores Number of Subjects with: It is obvious that the stimulus determinants of preference reside in some aspect of left- right asymmetry. This was demonstrated by reversing the face and comparing the original and reversed faces to the same face composed of two left halves or two right halves.

She then became a professor at the University of Chicago. There were 22 degrees-of-freedom in all comparisons. 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.

A Model for the Genetics of Handedness

If the focus of importance or interest, or if these are equal on left and right, the greater heaviness, is on your left, check the column under LEFT and if on your right, the column under RIGHT. They were asked to judge the location of the more important content, and if this was symmetric, then the side of greater heaviness. Correlational analyses among A, R, and L were carried out in order to deter- mine the proportions of variance in average slide preference scores which could be accounted for by A and by slide preferences of the other handedness group.


This page was last edited on 10 Septemberat Received23 October Abstract–Left and right handers were found to differ in their preferences for mirror versions of vacation slides. I t follows, therefore, t h a t i f lateral specializa- tion leads to stimulus-independent lateral biases in behavior, such lateralization m u s t f o r this r e levvy s o n have been u n d e r negative selective pressures. Refinements designed to explain relevant qualitative facts are proposed and discussed. In the slide-analysis, slide-specific asymmetry scores A were assigned to each of the 28 slides.

Subjects were simply asked to view the 97 slide pairs and to choose the member of each lvey that they preferred. Jeerre were tested in one of four group sessions, in two of which Carousel B was located in the top projector and in two of which Carousel A was located in the top projector.

Cerebral asymmetries as manifested in split-brain man. Cerebral commissurotomy in man: Max Coltheart – – Behavioral and Brain Sciences 4 1: She received her PhD in The preference data from Study I for these slides were then reanalyzed to determine slide-specific preference scores for the entire group of right-handers Rincluding both experimental and Group SD subjects, and for the group of 31 left-handers L. F o r 12 subjects the absolute value o 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.

Pictures which correct for this imbalance by having their more important content or greater heaviness on the right are considered, for this reason, to be lsvy aesthetically pleasing.

Left and right in pictures. Materials Stimulus materials consisted of 7 randomly selected slides, chosen from the 14 P slides of the previous investigation, the mirror versions Non-P slides of the remaining 14 slides, and 14 additional slides called Srandomly selected from the 28 slides preferred by at least 15 and no more than 16 of the 31 subjects in Group SD.

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