Which factor is NOT considered a psychophysical indicator of CNS stimulant influence?

Excessive calmness is not considered a psychophysical indicator of CNS stimulant influence as it is contrary to the typical effects of stimulants. Central Nervous System (CNS) stimulants, such as amphetamines or cocaine, generally result in increased activity, heightened alertness, and increased energy levels. Indicators of stimulant influence typically include symptoms like accelerated internal clock, where individuals may exhibit a distorted sense of time due to heightened arousal, and divided attention impairment, which reflects difficulties in focusing on multiple tasks at once.

Additionally, possible rigid muscles can also manifest, as some stimulants may lead to increased muscle tension or rigidity. However, excessive calmness would suggest the opposite effect, indicating a lack of stimulation or sedative influence, which does not align with the expected outcomes of CNS stimulant use.