Previsual

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Previsual literally means "before seeing". Usually, it is applied to a mean of detection of a phenomenon before its consequences are noticeable or irreversible. Previsual detection lies on the influence of the phenomenon on another indicators different from those than one intend to avoid.

[edit] Example

An example of previsual detection would be that of a plant stress (for instance lack of water or nutrients) by means of its influence on sun-induced fluorescence emission of light by the leaves (Chappelle et al., 1984).

[edit] References

• CHAPPELLE EW, MCMURTREY JE, WOOD FM, et al. (1984), LASER-INDUCED FLUORESCENCE OF GREEN PLANTS .2. LIF CAUSED BY NUTRIENT DEFICIENCIES IN CORN, Applied Optics 23 (1): 139-142 1984