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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

Image

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 Optical coherence tomography

Typical optical coherence tomography system, based on a broadband source and fiber-optic Michelson interferometer.

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from article Optical coherence tomography

Optical coherence tomography images of healthy hamster skin in vivo. (a) Conventional magnitude image. Various layers of skin can be seen in cross section. (b) Result after Doppler processing of the same signal used to create the magnitude image.…

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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…