thebaine

n. an opium alkaloid that is chemically similar to morphine but has stimulatory effects. It comprises about 0.2% of natural opium. Although thebaine lacks the analgesic effect of morphine, it can be converted to several important opioid agonists and antagonists (e.g., buprenorphine, naloxone).

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Psychology term of the day

November 17th 2024

visual area

any of many regions of the cerebral cortex in which the neurons are primarily sensitive to visual stimulation. Together, all the visual areas comprise the visual cortex. Most visual areas can be distinguished from one another on the basis of their anatomical connections (i.e., their cytoarchitecture) and their specific visual sensitivities. Individual areas are designated by “V” and a number that indicates roughly how distant the area is from striate cortex. See V1; V2; V3; V4; V5.