This paper consists of two parts. Part one describes an experiment on the hemispheric asymmetries in the perception of visual stimuli. It was designed to test the accuracy of the well-known notion that "the left hemisphere is superior for analytical or serial verbal processing, and the right hemisphere is superior for holistic or parallel visuospatial processing". Four kinds of visual materials, named Chinese Characters. English Syllable, Latticed Square, and Gestalt Closure, were tachistoscopically exposed in the LVF (left visual field) and the RVF (right visual field) of 71 college students, through visual half-field presentation, with visual angle of 2°to 6° from fixation point, and with exposure time of 40 msec. The subject was required to do immediate recall by writing down what he or she had perceived. Recall score, the percentage of correct recall, was used as response measures. Data thus obtained were analyzed by within-Ss factorial ANOVA. The results were as follows: (1) Items of English Syllable presented in RVF to LH (left hemisphere) were more accurately identified than they were presented in LVF to RH(right hemisphere). (2) No significant laterality differences was found in regard to the recall scores of Chinese Characters. The hypothesis that "since the item of Chinese Characters is sequential in nature, it would be more superiorly processed by left hemisphere" was not supported The nonsignificant differences was possibly due to t act that exposure time of 40 msec was too long for each item of Chinese Characters and therefore the item discrimination power was not good enough, or due the possibility that both the left and the right hemispheres had the storage of Chinese lexical knowledge. (3) Contradictory to what was predicted, Ss yielded significantly more accurate responses to items of Latticed Square when they were exposed to LH than when they were exposed to RH. This fact suggested that the items of Latticed Square might possibly contain in it some sequential information which the LH is superior to process, and that the digit presented at the fixation-point might cause the activated state of the LH and then produced an artifactual advantage for the LH. (4) In regard to items of Gestalt Closure, there was no lateral superiority for the RH. The hypothesis that the RH is superior for holistic or simultaneous information processing was not supported in this case. Part 2 describes the results of the study on validation of tests and scales hypothesized to measure cerebral laterality. The present author felt strongly that such kinds of tests or scales should be validated by using the same subjects who participated in the experiment on cerebral laterality. Therefore the same 71 college students also served as subjects of this part of study. For each subject, a LH score and a RH score were obtained through experiment, testing, and scaling. The results were as follows: (1) The application of a multitrait-multimethod approach (Campbell and Fiske, 1959) to the construct validity failed to show promising evidence for either convergent or discriminant validity of the tests and scales supposed to measure hemisphere differences in this study. (2) The canonical correlation between variables of measurements (the LH and the RH scores obtained from testing and scaling) and the variables of experiment (the LH and the RH scores obtained from experiment) was not significantly different from zero both statistically and practically. Thus, the concurrent validity of the tests and the scales employed in this study was also not promising, when the LH and the RH scores obtained from experiment were used as criteria in this validation study. Based on these findings, the present author pointed out that it is inappropriate to claim that a test or a scale can be used to assess hemispheric brain functions, or to classify an individual into left-brain or right brain type, unless the test or the scale has a significant construct or concurrent validity based upon correspondence with a criterion obtained from experiment of hemispheric laterality.