Find over 25,000 psychological definitions


myasthenia gravis

an autoimmune disorder (see autoimmunity) in which the body produces antibodies against acetylcholine receptors, causing faulty transmission of nerve impulses at neuromuscular junctions. Affected muscles—initially those of the face and neck—are easily fatigued and may become paralyzed temporarily (e.g., muscles involved in eating may fail to function normally toward the end of a meal, speech may become slurred after a period of talking). The disease is progressive, eventually affecting muscles throughout the body.

Browse dictionary by letter

a b c d e f g h i j k l m n o p q r s t u v w x y z

Psychology term of the day

November 18th 2024

primary reinforcer

primary reinforcer

see natural reinforcer; primary reinforcement.