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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 Geochemistry

Volcanic gas sampling. Samples of volcanic gases and rocks may be collected and analyzed for their chemical-element content to better understand changes related to volcanic activity as well as to gain a greater understanding of the carbon and sulfur…

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from article Musical acoustics

Students in the Curtis Symphony Orchestra playing a range of string and wind instruments. (Credit: Allentownpa.gov/Curtis Institute of Music)

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from article Musical acoustics

Holographic interferograms of a snare drum. (a) 874 Hz. (b) 1064 Hz. (c) 1176 Hz. (d) 1271 Hz. (e) 1408 Hz. (f) 1670 Hz.

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from article Musical acoustics

Combination tones due to two tones of varying separation shown on a musical staff. As the difference tone rises, the cubic difference tone falls, so that they cross at f2 = 3/2 f1 (a perfect fifth).