Suppose Maria is painting her bedroom while the sun is setting. After a while she decides to stop because she suddenly notices that the room has gotten darker. Maria's experiences illustrate the role of ________ in sensation

a) Weberian threshold
b) a just-noticeable difference
c) absolute threshold
d) bias

ANS: B, This example demonstrates a just noticeable difference, because Maria identifies that the room has gone sufficiently dark to necessitate quitting work.