Final answer:
In electrophysiological studies, maximal stimulation is used to determine threshold levels, while supramaximal stimulation is used to ensure all fibers are activated for larger responses in compound action potential recordings.
Step-by-step explanation:
The question pertains to the field of electrophysiological recordings, specifically within the study of nerve or muscle function. In such studies, maximal stimulation is appropriate for thresholds determination, because it is the highest stimulus intensity that produces a maximum response without causing damage. On the other hand, supramaximal stimulation is necessary in compound action potential recordings to ensure that all the nerve fibers or muscle fibers are activated and the largest possible response is obtained. This level of stimulation is beyond the threshold required to elicit the maximum response, but not so intense as to cause over-stimulation or damage to the tissue.