Pattern discrimination by dewinged walking flies (Boettcherisca peregrina) was tested in behavioral experiments. After emergence, the flies were deprived of light or visual patterns. Deprivation impaired the normal development of visual pattern discrimination without impairing phototaxis. Flies kept in a lighted, white, unpatterned environment could not discriminate visual patterns, nor could flies kept in continuous darkness. These results indicate that there is considerable plasticity in the structure of the visual system of these flies.

There is a periodic fluctuation in amplitude of the alpha wave known as the "waxing and waning" phenomena. This periodicity was studied in human adults by means of the simplified method of frequency band analysis on the amplitude envelope of the alpha wave.

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and JASPER & ANDREWS5)described minor tremors (MT),or microvibrations,on the human body surface which are inapparent to the naked eye.Subsequently,many investigations have been done including the recent studeis by ROHRACHER8,9,10,11,12,13)and INANAGA et al.1,2,3,4).However, few studies have so far been done on the mechanism of the development of MT.ROHRACHER9,10,12)supposed that MT were due to the action of the autonomic nervous system which regulates body temperature,because they can be found continuously only in warmblooded animals and not at all in cold-blooded animals. SUGANO and INANAGA19,20)suggested,on the other hand, that the spinal