Gertrude Put on a New Watch This Morning and Found

Multiple Choice

Gertrude put on a new watch this morning and found it uncomfortable because it was so much heavier than her old watch.However, at 3:00 o'clock when someone asks her for the time Gertrude finds she has forgotten she is even wearing the watch.The change in Gertrude's sensitivity to the pressure of the watch illustrates the principle of:

A) perceptual invariance
B) perceptual assimilation
C) changing difference thresholds
D) sensory adaptation