THE FREQUENCY LIMITS OF THE BINAURAL PHASE 
DIFFERENCE AND INTENSITY EFFECTS 
G. W. STEWART 
ABSTRACT 
The variation in localization of a phantom source with phase 
difference only at the ears and the variation with intensity dif- 
ferences only at the ears are here called the binaural phase dif- 
ference effect and the binaural intensity effect respectively. That 
these variations follow according to law, the former linearly and 
the latter logarithmically, is not discussed. 
Individual 
Eimit or Phase: 
Ee'FEct 
Eapses in Intensity Eeeect. 
Observations from 100 to 1000 
EMB 
1360 D. V. 
None 
AETF 
1335 
850-1250 
CICK 
1119 
None 
HMH 
1474 
Over entire range 
ME 
1767 
1450-2000 
IK 
1249 
None 
ES 
1392 
1450-1850 
CRB 
1333 
850-1250 and 1550-2000 
SC 
1161 
None 
ERK 
1146 
1150-1250 
CEE 
1058 
1450-2000 
RK 
1145 
None 
BWS 
1248 
850-1150 
EGR 
1151 
None 
ACR 
825 
1750-2000 
GRW 
1393 
950-1850 
The above table shows the results of experiments upon sixteen 
individuals. It is to be noted that the limit of the phase effect, 
or the frequency at which the phase effect ceases is approximately 
the same in all of the observers and that the lapses in the intensity 
effect seem to have no similarity. Experiments covered the range 
from 100 to 2000 d.v. Scattered experiments up to 4000 d.v. 
show no return of the phase effect but additional lapses in the 
intensity effect. 
Physical Laboratory, 
University oe Iowa. 
