lumbosacral plexus

a network of nerve fibers derived from the spinal roots of the fourth and fifth lumbar nerves and first through fourth sacral nerves (see spinal nerve). It supplies the muscles of the leg and foot. The largest derivative of the lumbosacral plexus is the sciatic nerve. Also called lumbrosacral plexus.

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Psychology term of the day

January 3rd 2025

noncontingent reinforcement

the process or circumstances in which a stimulus known to be effective as a reinforcer is presented independently of any particular behavior. Because contingencies may arise by accident (see accidental reinforcement), behavior-independent presentation of stimuli cannot guarantee that no contingency exists between a response and the stimuli. See reinforcement.