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A continuous performance task, continuous performance test, or CPT, is any of several kinds of neuropsychological test that measures a person's sustained and selective attention. Sustained attention is the ability to maintain a consistent focus on some continuous activity or stimuli , and is associated with impulsivity .
Many different tests on attention span have been used in different populations and in different times. Some tests measure short-term, focused attention abilities (which is typically below normal in people with ADHD), and others provide information about how easily distracted the test-taker is (typically a significant problem in people with ADHD).
The Test of Everyday Attention (TEA) is designed to measure attention in adults age 18 through 80 years. The test comprises 8 subsets that represent everyday tasks and has three parallel forms. [ 1 ] It assess three aspects of attentional functioning: selective attention , sustained attention , and mental shifting .
The d2 Test of Attention is a neuropsychological measure of selective and sustained attention and visual scanning speed. [1] It is a paper and pencil test that asks participants to cross out any letter "d" with two marks around above it or below it in any order. [ 2 ]
To test whether distraction in the first phase resulted in increased responsiveness during the re-exposure phase, experimenters "compared mean unpleasantness ratings between unpleasant pictures that were previously presented in the attend (previous attention) versus distract (previous distraction) condition using a paired t-test".
Since 1798, the medical literature on attentional disorders has distinguished between at least two kinds: one a disorder of distractibility, lack of sustained attention, and poor inhibition (that is now known as ADHD), and the other a disorder of low power, arousal, or oriented/selective attention (now known as CDS). [3]
Attention is manifested by an attentional bottleneck, in terms of the amount of data the brain can process each second; for example, in human vision, less than 1% of the visual input data stream of 1MByte/sec can enter the bottleneck, [4] [5] leading to inattentional blindness.
The Trail Making Test is a neuropsychological test of visual attention and task switching. It has two parts, in which the subject is instructed to connect a set of 25 dots as quickly as possible while maintaining accuracy. [ 1 ]