278 



Mr. C. S. Myers. The Influence of 



those at 90° v. suffered most in! the accuracy with which they were localised 

 under the above conditions. 



These results may be tabulated thus, the figures showing the percentages 

 of error, doubtful or ambiguous answers being counted as half errors, wrong 

 answers as whole errors, and the two vertical columns for each subject repre- 

 senting the results respectively obtained from the two sittings at which each 

 was examined : — 



Subject I. Subject II. 



Horn and slides in B position 6 6 22 



Horn in B position, slides in varied position... 14 31 22 — 



Slides in B position, horn in varied position... 33 58 — 29 



Six times, the near or C position of the horn caused a sound at 90° v. to be 

 located at 0°, and on two occasions, one at 180° to be located at 90° v. Three 

 times, immediately, following a sound given with the open or C position of 

 the slides, a sound given at 0° with the B position of the slides was located 

 at 90° v. ; and on two occasions, immediately following a sound given with 

 the B position of the slides, a sound given at 90° v. with the C position of the 

 slides was located at 0°. 



The following answers. illustrate the difficulties in which the subjects found 

 themselves, and indicate the bases of their judgments of localisation : — 



Sound given. 



Subject's reply. 



Slides C 



90 v. 



„ c 



90 v 



„ A 







„ A 







A 







Horn C 



90 v 



„ C 



90 t. 



„ A 







0°. " Because it was so full ; yet it seemed perfectly vertical and 



hit me on top of the head." 

 0° or 90° v. " It seemed loud, hence front ; yet far away, hence top." 

 ? 90° v., hesitation. " Because, though not so weak as a top sound, 



yet it does not seem so direct as a front one." 

 90° v. "Because it is so faint." 



? 0°. " It is rather weak, though, for a front sound." 



? 0°. " It has the character of a front sound in coming from a 



distance, but it's so drony and dreary." 

 0°. " Its character resembled the previous sound [B, 90° v.], yet it 



came from so short a distance as to seem front." 

 90° v. " It's drony, yet it's rather too loud for top." 



(b) For Soionds in the Horizontal Plane. — The influence of changing the 

 timbre and loudness of the sounds on their localisation is not less marked for 

 sounds in the horizontal plane, although certain differences are to be noted. 

 In the following record of one of my subjects the first two columns give the 

 actual, and the third column gives the apparent positions of the sound, the 

 observations of the subject being given in footnotes : — 



