Abstract
Sato measured suditory space with various methods; the results are summarized as follows :
(1) When an acoustic source mekes slowly rectilineal motion to various directions, the locuge of auditory image deviate convex to the head. In the horizontal plane, the degree of deviation is most intensive at the side and back. In the frontal plane, it is similarly intensive at the side and foot, dut at the upside the deviation is not to be seen. In the median plane the locus is indistinct. (2) With the increase of the distance from the ear in hewing two acoustic images gradually fuse into one and five periods can be classified in them. Linking the points of same period in various directions I got a horizontal component of auditory space which is flat at the side and back. In the same way the frontal and median components were measured. (3) From three sound images which are corresponding to three sound sources on a spherical surface and audible at equal intervals, I got a tangent at the middle sound image by the bisection method and measured the auditory space of phenomenal type. Its horizontal component is flat at the side, the frontal one is flat at the side and the median one has a tendency to be flat in front and lengthened postero-inferiorly. (4) Many sound sources which are formed in a straight line at the various position in the hosizontal plane can be heard not as a rectilineal image but as two groups of sound images which lie on the left and right side or in front and at the back and are of huge comma shape. Using them as a indicator the auditory space was measured just in the same way as in (2). From the many sound sources formed. rn a circle quite similar phenomena were to be seen.
