An investigation of the temporal delays associated with internal‐sidetone pathways was undertaken. The results showed delay to be a function of frequency for impulsive signals transmitted from the incisors to the mastoid process by bone and from the thyroid cartilage to the mastoid process by tissue. A similar finding was obtained for phonated signals transmitted from the vocal cords to the mastoid process by the internal sidetone pathways of minimum delay irrespective of media.