Interaction between the primary evoked respone of the cat auditory cortex and the transcallosal volley have been studied under nembutal anesthesia.
By pure tone stimulation typical on-and offresponse were produced in the auditory cortex, both consisting of the biphasic waves (initial positivity followed by the negativity in the surface, deeeper position from surface).
The first component of the on-response, having after the shock. As for the second component, the was more prolonged.
Off-response, although less frequently observed, was similiar in shape to the on-response, except the former longer latency.
Evoked potential elicited by the click was not different from it by the pure tone in on-response.
Transcallosal response of the ectosylvian gyrus elicited by 1_??_10 stimulation of the homotopical cortical point reptitively, was biphasic (positivenegative at the surface, negative-positive at deep), the peak and 40 msec duration.
Primary evoked response, both first and second component, could be abolished completely or reduced in size, if the conditioning transcallosal potential the fromer could be as late as 60 msec prolonged in some cases.
Primary response could be augumented in size, if the transcallosal volley proceeded by about 50_??_100 msec in physiological homotopical point stimulation.
The transcallosal response was also reduced in size by the conditioning pure tone, when the conditioning-testing intervals was about 10 msec. However the former was never augumented by the latter conditioning.
It was confirmed that the section of the transcallosal body abolished the transcallosal response, leaving the primary response unchanged.
It is suggested that facilitatory and inhibitory interaction between transcallosal stimulation and primary response of the auditory cortex may exert a role in the fine integrative discrimination of sound.

抄録全体を表示

At the beginning of the 1960s, electronics component makers experienced difficulties as a result of the increased variety of products, since this hampered the progress of mass-production and cost reductions. The Electronic Industries Association of Japan (EIAJ) tried to solve this problem by making group standards (Component Engineering Standards: CES) which were suited to the markets of the day. In the process of making the draft standards, not only components makers but also television and radio set-makers joined the working groups and delivered their opinions. The working groups avoided setting strict standards so that members would not hesitate to use them. By the end of the 1960s, more than 80 CES had been established. Many set-makers used the CES standards to reduce the variety of components they purchased and this enabled the components makers to increase the level of mass-production. JIS standards were only applied to the establishment of technical terms, to definitions and to methods of testing. A negative point, however, was that as the tolerance of CES was assumed to be at a level similar to JIS, CES standards could not serve as a target for components makers who had already attained manufacturing techniques superior to JIS. These firms therefore gave priority to in-house specifications rather than to CES when producing parts for which new techniques were required.

抄録全体を表示