neuron doctrine

the principle that the nervous system is composed of individual cells (neurons) that make contact with each other but do not interpenetrate. Before this doctrine was accepted, many assumed that the nervous system consisted of continuous tubelike networks. Also called neuron theory. [presented in 1891 by German physician Heinrich Wilhelm von Waldeyer-Hartz (1836–1921)]

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Psychology term of the day

January 11th 2025

test marketing

research undertaken to assess consumer reactions to new or altered products. Companies often try to carry out this research discreetly so that competitors are unaware of any potential changes. On the basis of the results, products may be introduced into the general market, introduced after changes, or withdrawn.