When They Used a Forced Choice Test Procedure, Nachmias Et

Multiple Choice

When they used a forced choice test procedure, Nachmias et al. found, after adaptation to a square-wave grating:

A) Threshold elevation of a sine-wave grating of a frequency of the fifth harmonic of the adaptor
B) No threshold elevation of a sine-wave grating of a frequency of the fundamental of the adaptor
C) No threshold elevation of a sine-wave grating of a frequency of the third harmonic of the adaptor
D) Threshold elevation of a sine-wave grating of a frequency of one-third of the fundamental frequency of the adaptor