Final answer:
Operational span testing measures working memory capacity, while psychophysical discrimination testing evaluates the ability to distinguish between sensory stimuli.
Step-by-step explanation:
Operational span testing and psychophysical discrimination testing are two different methods used to assess sensory discrimination abilities. Operational span testing is a cognitive task that measures working memory capacity, while psychophysical discrimination testing evaluates the ability to distinguish between different sensory stimuli, such as touch or sound. Operational span testing involves remembering and organizing items or tasks presented to the individual, while psychophysical discrimination testing involves detecting and discriminating between sensory stimuli based on their characteristics, such as intensity or location.