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Paced Auditory Serial Addition Test (PASAT)
Please visit this website for more information about the instrument: Paced Auditory Serial Addition Test


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Supplemental-Highly Recommended: Myalgic encephalomyelitis/Chronic fatigue syndrome (ME/CFS)
Short Description of Instrument
This is a speed dependent test that is very sensitive to deficits in information processing ability. It is also a test of sustained attention. Norms for the "Standard" PASAT
The PASAT consists of four sets. Each set has 50 numbers. The time intervals for each set are 2.4, 2.0, 1.6 and 1.2 seconds. The CD version of the PASAT allows for calculation of normative standard scores. These normative scores were constructed from a meta-analysis of three normative studies of the PASAT. The findings of these studies were used to form composite norms using regression procedures. The studies included a composite sample of 1,488 normal volunteers. The norms were designed to generate two T scores, one based on the composite sample without any demographic corrections, and a second T score based on an Age correction.
ME/CFS Specific: A staple in any cognitive study of ME/CFS as the instrument is very sensitive to deficits in information processing and working memory. A modified version for neuroimaging exists and has been used many times (Lange et al., 2005; Cook et al., 2007).
Time to Administer: 15 minutes, including training
The brain metrics version is based on Gronwall's version (Gronwall, 1977) of the test and scored electronically.
Gronwall DM. Paced auditory serial-addition task: a measure of recovery from concussion. Percept Mot Skills. 1977;44(2):367-373.
Cook DB, O'Connor PJ, Lange G, Steffener J. Functional neuroimaging correlates of mental fatigue induced by cognition among chronic fatigue syndrome patients and controls. NeuroImage. 2007;36(1):108-122.
DeLuca J, Johnson, SK, Natelson BH. Information Processing Efficiency in Chronic Fatigue Syndrome and Multiple Sclerosis. Arch Neurol. 1993;50(3):301-304.
Fischer JS, Jak AJ, Knicker JE, Rudick RA, Cutter G. Multiple Sclerosis Functional Composite Administration and Scoring Manual. New York, National Multiple Sclerosis Society, 2001, pp. 14-18.
Lange G, Steffener TJ, Cook DB, Bly BM, Christodoulou C, Liu WC, DeLuca J, Natelson BH. Objective evidence of cognitive complaints in Chronic Fatigue Syndrome: A BOLD fMRI study of verbal working memory. 2005;26(2):513-524.
Tombaugh TN. A comprehensive review of the Paced Auditory Serial Addition Test (PASAT). Arch Clin Neuropsychol. 2006; 21(1):53-76.


Document last updated August 2022
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