Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions
Scenario I
A psychologist interested in studying visual perception manipulates the brightness of a light in the imperceptible to very dim range.Each level of brightness (measured in lumens) is studied for 10 trials,and on each trial participants are asked if they can detect the light.Figure 4.1 shows hypothetical data from one participant.
Figure 4.1
-(Scenario I) To minimize the effects of expectancies and sensory adaptation,the researcher should:

A) manipulate brightness in descending,rather than ascending,order.
B) manipulate brightness randomly on a trial-by-trial basis.
C) deceive participants as to the true purpose of the study.
D) increase the number of trials that each level of brightness is experienced.