PSYCHOGRAM IN VOCATIONAL GUIDANCE 
341 
THE PSYCHOGRAM IN VOCATIONAL GUIDANCE. 
CARL E.. SEASHORE. 
The speaker reported a method, “percental rank”, for re- 
ducing diverse psychophysic measurements to a common unit 
for the purpose of a simple and direct numerical statement and 
graphic representation of a series of measurements on talent. 
The illustrations were drawn from the measurements on mu- 
sical talent. After a certain measurement has been standard- 
ized so that the various factors, subjective and objective, are 
under control, a large number, from 400 to 4,000, depending 
upon the needs, are made for the purpose of establishing a 
normal distribution of abilities. On the basis of this norm, 
all the cases are arranged in percental rank, the poorest one 
being 1 per cent, and the best 100 per cent, all the rest being 
arranged in the order of rank between these two extremes. 
Corresponding to this complete series of ranks the actual meas- 
urements, for instance, on tonal memory, are arranged in a 
parallel column so that one can at once convert a given meas- 
ure on tonal memory into a percental rank or vice versa. The 
same is done for each and every kind of measurement but 
these are all reduced to the same unit so that a record may 
run something like this: 
Per cent. 
Per cent. 
Tonal hearing 
19 
Sensitiveness to sound 
.90 
Tonal memory ...... 
46 
Discrimination for sound. . . 
.78 
Tonal imagery 
20 
Reproduction of a tone 
.48 
Consonance 
70 
Reproduction of an interval 
.52 
rime sense 
51 
Vocal training 
.89 
Free rhythm 
31 
Instrumental training 
.98 
Regulated rhythm . . . 
.......39 
Musical appreciation 
.40 
Fig. 28. — Psychogram showing musical talent. 
