| Are there two visual systems-one for perception and the other for action? Goodale, M.A. andhis colleagues had proposed a two-visual-systems hypothesis that based on the neurophysiologyand neuropsychological experiments which found a dissociation of perception and action. If theirtheory is reasonable, then we could observe the dissociation in normal human. The researches ofOptical Illusions could provide some behavioral evidences for supporting the two-visual-systemstheory.The study performed by Aglioti, et.al, which used the Ebbinghaus illusion, seemed as if offeredgood evidences for the theory. The following investigations which used a variety of opticalillusions including the Ebbinghaus illusion, however, found that there had been no consensusresults. So we hope that we could confirm or falsify the theory by using the conflict or interferencein perception.We carried out three experiments, which adopted Stroop and Garner paradigm and took theArabic numerals as our experimental materials. We mainly wanted to know if there had beendifferences for dependent variables under the conditions of congruent or incongruent or theconditions of baseline or filtering when the Ss grasped or pointed the materials. The resultsshowed that Stroop and Garner interference had no effect, but the interactive effect betweenStroop and width was significant. To our surprise, however, the order of number (ascending ordescending) had significantly affected action. And the interactive effect between Stroop andnumeral order was significant. These results indicated that interference or conflict had impactedon action. In addition, through the results of the 1st and 3rd experiment we found that there hadbeen a common tendency (but no statistic significance), that was, the changes of ambience couldgive rise to the difference in dependent variable under the two conditions of Garner effect, whenunder the filtering condition the MGA was larger than it under the baseline condition, so did themaximum velocity while pointing.Our experiments demonstrated that Perception—Action were not separate, furthermore, in some degree we could draw a conclusion that the action is holistic, which could be influenced bythe perceptual conflict and the changes of ambience. |
