Sensation and Perception (GRE Psychology): Questions 22 - 23 of 25
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Question number: 22
» Sensation and Perception » Psychophysics, Signal Detection
In a laboratory experiment, subjects wear headphones and are tested individually. Each of 500 subjects is presented first with a light and then possibly with a low-intensity tone in the earphones. Subjects are instructed to push a button if they hear a tone. Subjects are rewarded with $10 for each hit. In 500 trials, 200 times a tone was presented, and 300 times a tone was not presented. One hundred and ninety tones were detected. Also, the button was pressed 270 times in response to no tone.
Which of the following statements about the above experiment is in line with signal detection theory?
The reward for hits probably caused the high number of false alarms.
The tone and the light were probably not effectively paired because the tone only followed the light in 200 of the 500 trails.
Some subjects might have been distracted by the experiment design which called on visual and auditory sensory systems.
Subjects were unable to detect at least a few tones because some tones were not a just noticeable difference from the previously presented tones.
Question number: 23
» Sensation and Perception » Vision
Visual acuity is highest under what circumstances?
When the rods and the cones are equally stimulated
When the rods on the fovea are stimulated
When the cones on the fovea are stimulated
When the rods in the periphery of the retina are stimulated