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horizontal–vertical illusion

the misperception that vertical lines are longer than horizontal lines when both are actually the same length. The vertical element of an upper case letter T, for example, looks longer than the cross bar, even when the lengths are identical. See also foreshortening; Helmholtz square illusion.

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Psychology term of the day

February 19th 2025

size-invariant neuron

size-invariant neuron

see location-invariant neuron.