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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 Adenosine triphosphate (ATP)

Structure of adenosine triphosphate (ATP), which consists of ribose, adenine, and a triphosphate group (a chain of three phosphate groups, designated α, β, and γ). The structures of adenosine diphosphate (ADP), adenosine monophosphate (AMP), and…

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from article Adenosine triphosphate (ATP)

The ATP cycle, in which ATP is converted to ADP and phosphate (P), which is a process that creates energy for endergonic (energy-absorbing) reactions (for example, protein synthesis and muscle contraction); then, ADP is phosphorylated and converted…

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from article Sphaeractinoidea