Snellen chart

a device for testing visual acuity, consisting of printed letters ranging in size from very small to very large. The observer reads the letters at a given distance. Also called Snellen test. [Herman Snellen (1834–1908), Dutch ophthalmologist]

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Psychology term of the day

November 15th 2024

stotting

n. a stiff-legged jumping display, shown by many species of ungulates, in which all four legs are off the ground at the same time. Stotting appears to communicate to predators that the individual has detected them and has enough vigor to make capture difficult. Studies show that predators are more likely to give up a hunt when an animal stots.