Define the term - Stimulus

Stimulus and response characteristics of the tests themselves, as well as of the test instructions, become exceedingly important considerations. In general, the test material should consist of salient stimuli that the patient can readily see or hear and understand. Instructions should not be unduly complex, and if the patient has a sensory deficit, it should be possible to give the instructions in an intact modality, without jeopardising the use of established test norms. The opportunity should be available to repeat and paraphrase instructions until it is clear that they are understood. Similarly, the manner of responding to the test material (e.g. pressing a lever or writing on a multiple choice form) should be within the patient's capabilities.