You Train a Macaque to Respond to the Presentation of a Red

Multiple Choice

You train a macaque to respond to the presentation of a red circle by ringing a bell, after which she is presented with a treat. One evening, the power goes out, but you decide to continue your training with the macaque using the waning sunlight. To your surprise, the macaque seems to be unable to respond properly to the red circle after about an hour. What is one explanation for the macaque's regression?

A) The repeated training has made the red stimulus too ambiguous to the macaque's perception.
B) The waning light has made the red stimulus appear brighter due to increased cone activation.
C) The waning light has made the red stimulus less prominent due to increased rod activation.
D) The waning light has made the red stimulus less prominent due to decreased cone activation.
E) The repeated training has made the red stimulus appear green to the macaque.