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Auditory and Visual Continuous Performance Test (CPT)

Basic auditory vigilance is tested by having the patient listen to a series of letters read serially and responding to a single target letter or series of letter configurations. Visual vigilance can be tested by showing a series of single numbers on a computer screen and requires responding to a target stimulus, but not to non-target stimuli.

Sustained attention and vigilance

Paced Auditory Serial Addition Test (PASAT)

The patient hears a tape recorded voice reading numbers at various rates, ranging from every 2.4 seconds to every 1.2 seconds. The objective of the task is to sum the last two numbers heard and voice the sum aloud (e.g., if the numbers from the tape were ''5, 2, 8, 4,'' the patients responses would be the following (in italics): ''5,2, 7, 8,10, 4,12,'' etc.). The process of voicing the sum aloud serves as interference, which must be overcome in order to attend to the following number. In total, 60 numbers are read in each of the four trials and every subsequent trial is faster than the one preceding it.

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We have all been there: turning to the refrigerator if feeling lonely or bored or indulging in seconds or thirds if strained. But if you suffer from bulimia, the from time to time urge to overeat is more like an obsession.

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