Which term describes an individual's response to stimuli when the nervous system responds too little?

The term that describes an individual's response to stimuli when the nervous system responds too little is "hypo-responsive." This concept indicates a reduced sensitivity or reaction to stimuli that might normally elicit a response in others.

In the context of neurological or psychological assessments, hypo-responsiveness can manifest as a lack of reaction or diminished behavioral responses, which can impact how a person interacts with their environment or processes information. This condition can occur in various situations, such as certain medical conditions or developmental disorders, where the nervous system's ability to respond adequately to stimuli is diminished.

Other terms in the answer choices refer to different concepts. For instance, "hyper-responsive" refers to an exaggerated response to stimuli, which is the opposite of hypo-responsiveness. "Inter-trial interval" typically relates to the timing between trials in experimental settings, and "light physical prompt" refers to a gentle physical cue to guide behavior rather than a descriptor of response levels. Thus, hypo-responsive is the most accurate term for describing a decreased reaction to stimuli.