Masaru Nakaseko

Hand Differences on a Sensory Test Using Tactual Stimuli

To examine hand differences in the sensory feeling of texture, 35 subjects made sensory evaluations with the left and the right hands to a tactile stimulus (sponge rubber) and also marked on a 5-point Likert scale 50 adjectives which represented various tactual feelings. Factor analyses, applied to the data of 35 subjects, showed that the left hand related more to a keen and sharp dimension while the right hand related more to a mild and soft dimension of the tactile stimulus. Possible relations of these hand differences in sensitivity to hemisphere functioning were discussed.

Measuring of man at visual inspection task with psychophysiological responses

Work load of visual functions in visual inspection task was studied under a fairly constant working condition. This was carried out with ten subjects by measuring the work output, CFF variation, visual recognition threshold and heart beats;The results are as follows.1) The CFF variation rate decreased along with the work process, thereby indicating a strong tendency of work load accumulation.2) The variation rate decreased along with the work process, thereby indicating a strong tendency of work load accumulation.3) Negative correlation was found to exist between CFF variation and work output, but on the other hand, between visual recognition threshold and work output indicated a positive correlation. These relationships were reduced to the deterioration of visual function.4) The number of heart beats per minute was insufficient to evaluate the work load during inspection. But many of the workers showed a tendency of heart beats increment during inspection.Thus, the relationship among work load, CFF variation rate and visual recognition threshold have been clarified. Deterioration of visual function was thought to be due to the functional decrement of differentiation in CFF and of recognition in visual recognition threshold.