parallax

(ραγ' - Κ5) [Gr. παραλλάξ in turn]. An apparent displacement of an object due to a change in the patient’s position. binocular p., the seeming difference in position of an object as seen separately by one eye and then by the other, the head remaining stationary. cro ed p., heteronymous p., that in which the thing observed scems to move away from the open e, one of the eyes being closed or covered. ct p., homonymous p., that in which the thing seen appears to move toward the uncovered or open eye. vertical p., that in which the thing observed appears to move upward or downward. parallelism (par’al-el-izm). The doctrine that mental proce es and brain proce es run side by side and that they do not interact. See automelism. paralogia (par-al-o’je-ah) (Gr. rap a beside + λόγος reason]. A disordered state of the reason; impairment of the reasoning power marked by illogical or delusional speech. thematic p., a perversion of the mind in which the patient dwells unduly upon one subject. paralogism (par-al’oj-izm). |The use of meaningle or illogical language by the insane. para lysin (par-al’is-in). See agglutinin. paralysis (par-al’is-is) (Gr. rap a beside + Abew to loosen]. A lo of motion or sensation in a living part or member. p. of accommodation, paralysis of the ciliary muscles so as to prevent accommodation of the eye. acoustic p., nervous deafne . acute ascending p., a rapidly progre ing and often fatal ascending paralysis of unknown cause. It begins in the muscles of the feet and gradually ascends to the other muscles of the body. There are no discoverable lesions, and the disease runs its course in from two days to four weeks. Called also Landry’s p. acute atrophic p., infantile p., the acute anterior poliomyelitis of childhood. See poliomyelitis anterior. acute infectious p., acute anterior poliomyelitis. Ῥ. ag’itans, shaking palsy, or Parkins on's disease: a disease of late life, progre ive in its course, and marked by a characteristic tremor of the muscles, weakne , delay of voluntary motion, a peculiar festinating gait, and muscular contraction, causing peculiar and characteristic positions of the limbs and head. The disease is attended with exce ive sweating and feclings of heat and cold. alcoholic p., that caused by habitual drunkenne . anesthesia p., paralysis following anesthesia. anterior spinal p., poliomyelitis anterior. arsenical +, paralysis due to arsenical poisoning. ascendp., spinal paralysis that progre es cephalad. a ociation p. Same as bulbar p. asthenic bulbar p., myasthenia gravis pseudo paralytic a. asthenobulbospinal p., myasthenia gravis. atrophic spinal p., poliomyelitis anterior. Bell’s p., facial p., paralysis of the face due to lesion of the facial nerve or of its nucleus. Bernhardt’s p., pain and hyperesthesia on the outer surface of the thigh, due to disease of the external cutancous nerve of the thigh. birth-p., that which is due to injury received at birth. brachial Ῥ., paralysis of an arm. brachiofacial p., that which affects the face and an arm. Brown- Séquard’s p., paralysis of motion on one side and of sensation on the other after hem i section of the spinal cord. bulbar p., paralysis due to changes in the motor centers of the oblong at a: especially chronic or progre ive bulbar paralysis,