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from article Perception

Perception encompasses recognition in response to sensory stimuli. Stimulation of the body's receptor organs is transformed into neural activity and is relayed to more central regions of the nervous system. Then, further neural processing occurs,…

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from article Perception

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from article Perception

Perceptual organization. (a) The figure of a four (4) is immediately and spontaneously perceived, despite the presence of other overlapping and adjacent lines. (b) The four, although physically present, is not spontaneously perceived and is even…

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from article Perception

Transposition of form; the two shapes look the same despite the difference in size.

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from article Perception

This figure is not recognizable. If, however, it is tilted 90° clockwise, it will be recognized as an outline map of Africa.

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from article Perception

Geometrical illusions. (a) The Ponzo illusion in which the two horizontal lines of equal length appear unequal. (b) The Poggendorff illusion in which the two oblique line segments are aligned with one another (that is, are collinear), but appear to…

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from article Sphaeractinoidea

Sphaeractinoid Actinostromaria rhodaclada, Cretaceous, Jura Mountains: (a) tangential and (b) longitudinal section, ×6. (From A. Steiner, 1932)

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from article Poppy

Stems, fruits (capsules), and flower of the opium poppy (Papaver somniferum). By cutting into the fruits soon after the petals have fallen, the opium is obtained. (Credit: Milan Kořínek)

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from article Sarcomastigophora