substance P

a neuropeptide that functions as a neurotransmitter in both peripheral and central nervous systems. It belongs to the neurokinin family of transmitters. High concentrations of neurons containing substance P are localized in the dorsal horn of the spinal cord, where they play a role in the modulation of pain. In peripheral tissues, substance P acts as a vasodilator. It also has a role in sexual behavior and has been implicated in the regulation of mood.

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Psychology term of the day

October 18th 2024

subject of consciousness

1. the observing ego, or “I.” See also nominative self; self as observer.

2. the subject matter, or contents, of conscious experience. Compare object of consciousness.