TADA HIDEOKI

UENO HITOSHI

English

紀要類（bulletin）departmental bulletin pape

UENO, HITOSHI

TADA, HIDEOKI

Tohoku University Repository (TOUR) / 東北大学機関リポジトリ

Studies on Sensory Deprivation: III. Part 3.With Reference to Genetic Process ofPerception著者 UENO HITOSHI, TADA HIDEOKIjournal orpublication titleTohoku psychologica foliavolume 23number 3-4page range 60-62year 1966-03-19URL http://hdl.handle.net/10097/00123711STUDIES ON SENSORY DEPRIVATION : III PART 3. WITH REFERENCE TO GENETIC PROCESS OF PERCEPTION By HITOSHI U EN 0 (J::.!J ;li) and HIDEOKI TAD A ( E8 ~~Jl'ID (Department of Psychology, Tohoku Un!versity, Sendai) In order to investigate the effect of 24 hours sensory deprivation upon the genetic process of perception, subjects were asked to copy Figures 4 and 8 of Bender Gestalt Test for the tachistoscopically restricted exposure time duration. And it was found that the sensory deprivation deteriorated the perceptive organizing ability, while it lowered the perceptive threshold. In the present paper we investigated the effect of sensory deprivation upon genetic process of perception. We adopted Bender Gestalt Test as a means of investigating the organizing process of perception under the sensory deprivation. In the previous experiment <1 l, the following results were obtained: a) When the method of copying was used, Figures 4 and 8 of Bender Gestalt Test were suitable for analyzing the perceptual process, because they could be completely copied by subject, when enough time was given him, and they were not too easy to copy. b) Sensory deprivation deteriorated somewhat the "Gestaltung" of subjects. On the basis of the previous study, we designed an experiment. The purpose of this experiment is to anaswer the following question. What does it mean that sensory deprivation deteriorated the "Gestaltung"1 In other words, it is asked whe-ther the subject under sensory deprivation finds it difficult to sense the stimulus figures or to organize the sensed ones, or both. METHOD Subjects; The subjects in the experimental group are 10 male undergraduates of Tohoku University. They are tested about an hour after 24 hours sensory deprivation. The subjects in the control group are 12 male students. PROCEDURE Figures are tachistoscopically presented, one at a time. Exposure time duration is 5 ms., 11 ms., 18 ms., 50 ms., and 200 ms. Subjects are instructed to watch the exposed figure and to copy it on a sheet of paper with pencil as correctly as they can. RESULTS AND DISCUSSION Copied figures were evaluated by Pascal's criteria<3 >. Table 1 represents the Studies on Sensory Deprivation. III Table 1. Mean Score of Each Exposure Time Duration (Comparison of Exp. G. with Cont. G.) ___ ----1--·-· --~~.Fig. 4 Exposure time 1 Exp. G. Cont. G. ~ 5 ms. I 15.1 18.3 ll ms. ' 14.1 13.8 18 ms. 15.7 11.4 25 ms. 8.9 9.0 50 ms. 10.5 8.4 200 ms. 8.5 6.5 sum. 72.8 67.6 ·---··- ·-I- -- - -- ~.:.-~~·-8 __ _ t Exp. G. I Cont. G. 0.838 1 14.6 12.5 O.o75 7.9 11.9 1.162 1 1.2 6.8 o.031 I 5.7 9.4 0.618 9.2 6.3 0.870 I 6.5 6.1 0.311 51.1 53.9 t 0.674 1.026 0.125 l.l56 0.967 0•167 0.212 ------··---61 results of experimental group and control group for each exposure time duration. The main findings are as follows. a) Both experimental and control group show that the longer the exposed time duration becomes the lower the score is, i.e. the better acheivement is obtained. b) There is no significant difference between experimental group and control group. c) But it is noticed that the control group shows a linear decrement of score in general, while the experimental group represents an irregular decrement. d) The control group tends to show the better result at the longest exposure time duration, 200ms, than the experimental group. Table 2 shows a comparison between the results of the present experiment and those of the previous experiment in which figures had been presented until copying was completed. a) There is no significant difference between the two experimental groups. b) But in the two control groups, especially in case of Figure 4, the score of the present experiment is remarkably larger than that of the previous experiment (P<.Ol). Table 2. Comparison between the Results of the Present Experiment and those of the Previous Experiment ~- St. Fig. 4 · ... exposure -1 ·~-- --· · · '-~~~~~ unlimited 200 ms. ---- ~=:.:~ ~--;~-~- ::: t 0.917 *2.882 St. Fig. 8 un-li_m_i_te-d--,1-20~ ::. -~--t ::~ I :::-1 ~:::: These results appear to show that while the sensitivity of subject to perception in the experimental group is unchanged, or preferably becomes sharper than in the control group, the perceptive organizing ability of subject in the experimental group becomes duller than in control group. In other words, these facts can be interpreted as follows: the subject in the experimental group becomes sensitive to the visual sti-mulus, i.e. subject's perceptive threshold goes down. This interpretation will be 62 Hitoshi Ueno and Hideoki Tada supported by other results in our studies, which indicated the lowering of threshold in two point discrimination <2 > and in gustatory sensation under the sensory deprivation. Accordingly, it can be said that although in the experimental group the subject's perceptive threshold goes down, his organizing ability is deteriorated, and the subject in the control group is disturbed in perceiving stimulus figures by the restricted exposure time duration, although his organizing ability is not deteriorated. Therefore it is supposed that if the exposure time duration becomes longer than 200 ms., the difference between experimental group and control group may probably be greater than that in this experiment. REFERENCES (1) Hariu, T. and Ueno, H. Studies on sensory deprivation: II. With reference to the genetic process of perception (1). Tohoku Psychol. Folia, 1964, 20, 72-78. (2) Nagatsuka, Y. and Suzuki, Y. Studies on sensory deprivation: II. Effects of sensory deprivation upon perceptual and motor functions (2). Tohoku Psychol. Folia, 1964, 22, 64-68. (3) Pascal, G.R., & Stuttel Barbara, J. The Bender Gestalt Test., N.Y. Grune & Stratton, 1951. (Received January 10, 1965) ZusAMMENFASSUNG Die Figuren 4 und 8 von Bender Gestalt Test wurden wahrend der tachistoskopisch beschrankten Vorzeichungszeit nachgezeichnet, urn die Wirkung der 24 Stunden lang sinnlichen Entziehung auf das genetische Verfahren der Wahrnehmung (Akutalgenese) zu erforschen. Die Vpn. der Versuchsgruppe bestanden aus 10 Studenten und diejenigen der Kontrollgruppe aus 12. A us den Versuchsergebnissen folgt: Die sinnliche Entziehung setzte die Reizschwelle herab, und verschlechterte die Gestaltung. 

Studies on Sensory Deprivation: III. Part 3. With Reference to Genetic Process of Perception

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Studies on Sensory Deprivation: III. Part 3. With Reference to Genetic Process of Perception

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