Use the Following to Answer Questions

question 12

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.

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Definitions:

Decreased Preload

A reduction in the volume of blood returning to the heart before contraction, which can impact cardiac output and blood pressure.

Vasodilators

Medications or other agents that widen blood vessels, increasing blood flow and lowering blood pressure.

Atrial Fibrillation

A cardiac arrhythmia characterized by rapid, irregular beating of the atria, leading to poor blood flow and increased risk of stroke.

Heart Rate

The number of heartbeats per unit of time, typically expressed as beats per minute (bpm), indicating the heart's health and efficiency.