AX-Continuous Performance Test

**Semantic type:** Intellectual Product

**Definition:** A measure of sustained attention where the subject is instructed to respond one way whenever the stimulus is an X that was preceded by an A and another way for all other stimuli, including an A, an X that was not preceded by an A, and any other letter.

**Synonyms:** - A-X CPT - AX Continuous Performance Test - AX-CPT - AX-type CPT - Continuous Performance Test - AX version