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n. a method of mapping brain anatomy for diagnostic purposes by using ultrasonic waves. The waves are transmitted through the skull using an instrument called an echoencephalograph, and echoes of the waves from intracranial structures are recorded to produce a visual image called an echoencephalogram. The method, though still in use, is now considered outdated and has been largely superseded by such methods as transcranial Doppler ultrasonography.

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Psychology term of the day

February 26th 2024



n. red–green color blindness in which the deficiency is due to absence of the cone photopigment sensitive to green light, resulting in loss of green sensitivity and confusion between red and green (see dichromatism). The condition may be unilateral (i.e., color vision may be normal in one eye). See also protanopia.