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TIME AND INTENSITY IN PHOTOSENSORY STIMULATION
1Physiological Laboratory, College of Medicine, Creighton University, Omaha.
The Journal of General Physiology
|October 30, 2009
Summary
Light
Area of Science:
- Photochemistry
- Bioluminescence
- Sensory Physiology
Background:
- Light's photosensory effect relies on intensity and duration.
- Previous research established intensity-dependent and time-dependent effects separately.
Purpose of the Study:
- To investigate the combined effect of light intensity and time on photochemical reactions.
- To establish a quantitative relationship between these variables.
Main Methods:
- Controlled experiments varying light intensity and exposure time.
- Measurement of photochemical effect (E).
Main Results:
- When both intensity (I) and time (t) are varied, the photochemical effect (E) is proportional to the product of their separate activities: E = kt log I.
- This formula quantifies the relationship between illumination intensity and reaction time.
Conclusions:
- A unified equation describes the photosensory effect of light, incorporating both intensity and time.
- This provides a direct method to express the relationship between illumination intensity and Mya reaction time.
