What physical condition may be evident in a user of dissociative anesthetics?

The presence of muscle rigidity in individuals using dissociative anesthetics, such as ketamine or PCP (phencyclidine), is linked to the pharmacological effects these substances have on the central nervous system. These anesthetics can disrupt the normal functioning of neurotransmitters, particularly glutamate, leading to changes in motor control. As a result, users may experience heightened muscle tone or rigidity. This state can manifest as a stiffening of the muscles, which may be coupled with altered levels of consciousness or awareness, characteristic of dissociative intoxication. Understanding this physiological response is crucial for recognizing the signs of dissociative anesthetic use in various contexts, such as potential medical interventions or law enforcement scenarios.

Other options, such as loose joints, high flexibility, or muscle spasms, do not accurately represent the typical physical conditions associated with the use of dissociative anesthetics and are therefore not considered correct in this context.