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) Suppose that a second person is tested and is found to have a lower absolute threshold relative to the first.For this second person,the curve will shift _____ relative to the function shown in the figure.
Definitions:
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