[donh]

No! My, you persistently evade the point. Perception of light requires about 100 quanta. Rods have been activated by single quanta.

Everyone seems to have an opinion today about who's evading points. If I gave you a mechanical counter, could you click it each time you were made consciously aware of a photon stimulating one of your rods? Are you contending that stimulus you are not able to consciously discern is in some manner less of an inductive stretch than hooking up an oscilloscope? (or digging up a bone?)

[AndrewC]

In 1979 Baylor, Lamb and Yau were able to use rods from toads placed into electrodes to show directly that they respond to single photons.

That is my last post to you on the subject.