Eh, food for thought

[Michael_E]

It is commonly thought:  that afterimages are generated by
colour depletion, of the rods and cones in the eyes, caused by
staring at one colour for too long.  This generates the
reverse, or negative colour, of that colour.  An afterimage
stays in sight until this colour depletion is corrected, and
the eyes return to normal.

Now, you could say that my eyes are becoming depleted of the
colour blue, by continuing to do this, thus more easily
generating the yellow aura.  So, I turn around and look at a
red shirt hanging on a hook behind me, on the other side of
the room.  This time, a clear, dense, bright-green aura
appears in just under five seconds.  This is _far_ too short a
time to generate an afterimage?  Now, when I am on what I
call, a clairvoyant high, the auras of colours appear to me,
almost the instant I glance at them - within one second.
There is no appreciable delay at all, they are just there,
ballooning out from colours, as I look at them.-RB

It could be possible that RB is able to control the anatomy of the nerve cells in the eyes so that the threshold or the point in which it takes for the rods to become depleted become less. This would not be on a conscious level but by activating the goal processing aspect of our minds by saying to himself "lets see how long it takes for me to see how fast I can see an afterimage" he could be physiologically setting up the stage to minimize the threshold of the depletion of the rods whatever color they are being stimulated by. So, it wouldn't be a matter of it being biologically impossible for the rods to be depleting at the rate he is viewing them being depleted, but that no one has really tried to add an aspect of intention on how fast they could see an afterimage the way he did in the original findings(20 seconds or so) on how fast the rods can be depleted.