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Additionally, two catch trials, in which the same image was presented to both eyes for 1 s, were included.
The final VCRT version has 80 trials total (including two catch trials), and takes approximately 20 min to complete.
A change occurred (addition or removal of a sound source) on 75% of trials; the remaining 25% were catch trials where no change occurred.
One subject was excluded for incorrectly answering both catch trials, and of the 48 remaining subjects, 16 were male (mean age = 38.65 years).
Catch trials do not include a change type (add, remove) or a change level (+3, 0, –3) manipulation, as there is no change to be manipulated.
The initial test began with instructions and two practice trials, followed by 106 total trials (two of which were catch trials).
On the two catch trials, one chest radiograph was presented along with a landscape scene, and any response choosing the chest radiograph (either lung) was coded as correct.
During catch trials, the cursor was not turned on.
The catch trials were introduced with a 0° target.
The catch trials were excluded from all analyses.
To keep the subjects alert, we included catch trials.
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