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) What the participants perceive as the brightness of the light is determined by the _____ of the light wave.
Definitions:
Disadvantage
A condition or situation that makes it more difficult for someone or something to succeed or achieve a goal.
Weightlessness
The condition experienced when there is no perceivable gravitational force acting on a body, often occurring in space or during free-fall.
Circulatory Function
The role or process of circulating blood and lymph through the body, facilitated by the heart and blood vessels, to transport nutrients and remove waste.
Case Study Research
A research method involving an up-close, in-depth, and detailed examination of a subject of study and its related contextual conditions.
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