Abstract: A strong, light weight walking aid with optional seat that can be used to assist a person in walking and resting on the walking aid. The walking aid collapses so that it can be stored in a small space and the handle can be removed and reattached to make it even smaller. The walking aid is constructed of a double tube aluminum frame to make it strong without adding excess weight. It is provided with a padded, sure-grip handle and can be provided with braking mechanisms on some or all of the wheels.

Abstract: An evoked response audiometer method and apparatus in which a patient receives an auditory stimulus signal comprising a carrier frequency which is periodically amplitude modulated and frequency modulated whereby the stimulus is at least substantially frequency specific, the brain potential signals of the patient evoked by the auditory signal being sampled to determine whether phase locking to the modulated auditory signal has occurred, the auditory signal being selectively controlled to advance or delay one modulation with respect to the other modulation to cause enhancement of the evoked response to the auditory stimulus.