Phil Leigh;132739 Wrote: > They do have a sampling rate but it's probably very very high. The speed > of a state change across a synaptic gap. > > That isn't what's causing your prop blade effect. It's the "sampling > rate" of the reflection as the surface of the water is slowly moving up > and down (rippling) under gravity and/or air movement - this is the same > effect as car wheels on movies where the frame rate is interacting with > the frequency of a moving object, creating an optical illusion. > > Otherwise, we'd all be queuing for upsampling brain ops!
Actually I think there is some debate over this - see for example http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Retrieve&dopt=AbstractPlus&list_uids=15925801&itool=iconabstr&query_hl=2&itool=pubmed_docsum The consensus is that this effect exists and does not depend on something else (like your water) moving. Personally I've seen it many times in car hubcaps as traffic pulls away from a light. The arugment is over why it happens, and the best explanantion is something like this: that there are two sets of neurons, one for percieving clockwise motion and one for counter-clockwise. As something rotates clockwise the CW neurons are activated much more strongly than the CCW ones, but after some time they get "tired" (or overstimulated or whatever is the technical term - repeatedly given the same stimulus over and over, neurons will fire less and less strongly). However the CCW neurons are also firing a little (and don't tire as fast, since the stimulus was weaker), and so they at some point overwhelm the CW and you see a reversal in the motion. For some reason possibly having to do with some sort of "frame rate" the effect is strongest at certain frequencies (10-15 Hz). -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=24693 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
