| distance perception | The act of knowing or the recognition of a distance by recollective thought, or by means of a sensory process which is under the influence of set and of prior experience. (12 Dec 1998) |
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| time perception | The ability to estimate periods of time lapsed or duration of time. (12 Dec 1998) |
| electrochemical gradient | A measure of the tendency of an ion to move passively from one point to another, taking into consideration the differences in its concentration and in the electrical potentials between the two points; commonly expressed as the additional voltage needed to achieve equilibrium. (05 Mar 2000) |
| extrasensory perception | Perception by means other than through the ordinary senses; e.g., telepathy, clairvoyance, precognition. (05 Mar 2000) |
| ficoll gradient | A density gradient of ficoll (synthetic sucrose polymer) in solution, where concentration of the ficoll varies continuously through the solution. It is often used to separate different types of cells from each other during the process of sedimentation. (09 Oct 1997) |
| field gradient | In magnetic resonance imaging, a magnetic field that varies with location, superimposed on the uniform field of the magnet, to alter the resonant frequency of nuclei and allow recovery of their spatial position. Synonym: field gradient. (05 Mar 2000) |
| form perception | The sensory discrimination of a pattern shape or outline. (12 Dec 1998) |
| loudness perception | The perceived attribute of a sound which corresponds to the physical attribute of intensity. (12 Dec 1998) |