Kyle is holding a bag of 250 jelly beans. When Mark takes out two jelly beans, Kyle is not able to tell a difference. This illustrates __________.


A.Weber’s law

B.absolute threshold

C.sensory adaptation

D.signal detection theory


A spot in the middle of the retina that only contains cones is called the ___________.

Acornea
Boptic nerve
Cfovea
Doptic disk