The term "consensual reflex" refers to a physiological response where stimulation of one side of the body leads to a reaction on the opposite side. This phenomenon is often observed in the context of the nervous system, where sensory input triggers a reflexive action, such as a muscle contraction, in a corresponding area. In clinical settings, the consensual reflex is commonly tested during neurological examinations. For example, when light is shone in one eye, both pupils constrict, demonstrating the interconnectedness of the optic nerve and the brain. This reflex helps healthcare professionals assess the integrity of the nervous system.