perimeter

n. a hemispherical instrument used to plot the limits of the visual field. An individual is seated within the hemisphere and is asked to fixate a central spot of light. The visual field is then probed with small flashes of light, which the participant is asked to detect. The size and brightness of the flashes can be varied to assess visual sensitivity at many points within the field.

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Psychology term of the day

May 9th 2024

exon

n. a sequence of DNA within a gene that encodes a part or all of the gene’s product or function. Exons are separated by noncoding sequences (see intron).