frequency of light from the sun or illusion on brain

[ehcuob]

If you spin a spoked wheel at first its a blur then it slows next its at a stand still then goes backwards. This should be due to the frequency of incident light like a light bulb at 60 cycles per second to synchronize but yet you can see it in plain sun light, so who is suppling the frequency or sub frequency to conincide?

 

[MeteorWayne]

You can see it with your eyes in sunlight?<br /><br />I'll have to try that experiment. <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[qso1]

I'll go with brain illusion. In part because the brain is tricked into thinking motion pictures are actual motion when in fact motion pictures (Movies) are a series of still images strung together at 24 frames per second (30 fps for video). The reason for this is the phenomenon known as persitance of vision IIRC. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>

 

[spaceinvador_old]

I agree... with it being an illusion and brain related. Don't automobile rims do the same as well as helecopter blades when it comes to this effect? I also think I've seen this happen with jump ropers.<br /><br />I noticed this effect many years ago basically spinning a tire on my bike. Starting out slowly the spokes look like they are going in the right direction. The faster the tire/spokes spin, there is a moment where the spokes look like they aren't moving in a particular direction. Eccelerate the speed of the tire a little more and the spokes start to appear going in the opposite direction. Never understood it, but was a little fascinated by it.

 

[qso1]

Yep, car rims, helicopter blades, airplane propellers, bike tires and probably quite a few other spinning objects produce the effect. Or as I see it, the brain produces the effect based on the eyes input. Persistance of Vision or POV occurs when the brain thinks there is motion in rapidly moving, spinning objects. This occurs deliberatly with movies and the frame rate is based on what the eye percieves as smooth motion. Go to 15 fps and one can see a hint of jerkiness. Anything above 24 is smooth.<br /><br />For spinning objects such as car rims, I'm not absolutely certain how POV plays a role but it probably has to do with the fact that unlike movie frames, the object is circular and spinning. <div class="Discussion_UserSignature"> <p><strong>My borrowed quote for the time being:</strong></p><p><em>There are three kinds of people in life. Those who make it happen, those who watch it happen...and those who do not know what happened.</em></p> </div>

 

[MeteorWayne]

Here's a GREAT SITE to investigate how the eye-mind visual processing system works.<br /><br />What is there is not always what you see.<br /><br />I have spent hours on this site just amazed at how we work <img src="/images/icons/wink.gif" /> <div class="Discussion_UserSignature"> <p><font color="#000080"><em><font color="#000000">But the Krell forgot one thing John. Monsters. Monsters from the Id.</font></em> </font></p><p><font color="#000080">I really, really, really, really miss the "first unread post" function</font><font color="#000080"> </font></p> </div>

 

[nexium]

The sun and incandecent bulbs are not significantly amplitude modulated at 60 herz, and will not support strobe effects. Florescent tubes, TV screens and monitor screens and compact florescent bulbs do sometimes produce strobe light effects. Neil