|MadSci Network: Biophysics|
Airport landing lights take the form of a line of strobes, all fired sequentially (from farthest from end of runway to nearest...). The pilot (or ground observer..suitably placed..-within 0-15 degrees of line) sees a "dot" of light TRAVELING quickly in the correct direction. HOWEVER, as the observer moves more toward the perpendicular of the strobe line, the effect diminishes and finally (at about 70-90 degrees) becomes a "simultaneous" firing of all strobes at once, to the brain. This phenomenom demonstrates that the brain/retinal connection can discern time intervals more easily by seeing "intensity changes.." rather than by physical separation. That is, when viewed head-on the only effect the eye/brain can use is the decreasing intensity (which is size...of course..) of each flash as the sequence continues down the line of strobes. Yet, common sense (!!) indicates that we should be able to more easily detect apparent motion by movement ACROSS the field of vision... I realize that the answer could be as simple as: "yes," but am hoping for some insight..Has anyone explored this area?? Thanks, Pat Lueck...(curious about this for 20 years!!)
Re: Airport Landing Light 'Illusion...'
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