Continuous Performance Test (CPT)
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AX Continuous Performance Test (AX-CPT)
The AX Continuous Performance Test (AX-CPT) as described by Marcora et al (2009).
Continuous Performance Test
The original CPT described in Rosvold et al (1956). Subjects are shown a series of letters. In the first half of the experiment, they must respond whenever an "X" is displayed. In the second half, they must respond whenever an "A" followed by an "X" is displayed.
Continuous Performance Test, Identical Pairs (CPT-IP)
The Continuous Performance Test, Identical Pairs version (CPT-IP) by Cornblatt et al (1988).
Integrated Visual and Auditory Continuous Performance Test (IVA-CPT)
The Integrated Visual and Auditory Continuous Performance Test (IVA-CPT) by Sandford and Turner (2004).
References

Rosvold, H. E., Mirsky, A. F., Sarason, I., Bransome, Jr., E. D., Beck, L. H. (1956). A Continuous Performance Test of Brain Damage. Journal of Consulting Psychology, 20, 343-350.
Schein, J. D. (1962). Cross-validation of the Continuous Performance Test for brain damage. Journal of Consulting Psychology, 26, 115-118.
Cornblatt, B. A., Risch ,N. J., Faris,G., Friedman,D.& Erlenmeyer- Kimling, L. (1988). The continuous performance test, identical pairs version (CPT-IP): I. New findings about sustained attention in normal families. Psychiatry Research 26, 223-238.
Sandford, J. A., & Turner, A. (2004). IVA + plus: Integrated visual and Auditory Continuous Performance Test administration manual. Richmond, VA: Brain Train.
Marcora, S.M, Staiano, W. & Manning, V. (2009). Mental fatigue impairs physical performance in humans. J Appl Physiol, 106: 857–864.