Talk:Reverse rotation effect

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"Reverse rotation of wheels usually only occurs in film recording (for television or cinema)." I dispute that, or is it just me that it affects? --Thomas 16:57, 25 Mar 2005 (UTC)

The effect can easily occur on a CRT screen, or in a place where an artificial light connected to AC power is on (with or without sunlight present as well). Also I have seen it with entirely temporally continuous presentation, but this seems to only occur after many seconds of staring (which presumably adapts the normal motion detectors). If you think you have seen it without intermittent illumination and without many seconds of staring, I'd be interested to hear your story. --Alex Holcombe 16:05, 6 August 2005 (UTC)[reply]

I remember experiencing this effect all the time when I was younger sitting in the backseat watching cars drive past. I'm not sure whether I see it less now, or if I just don't think about it anymore. I don't really think I had to fixate my vision on the wheels for more than a second or two if at all before it happened, but I'm not really sure, as it's been some time since I've thought about it. I'll try to remember to think about it the next time I'm a passenger in a car. Also, should we perhaps include a mention of patterned hubcaps, since as of this version it seems it can only happen with wheels with actual spokes... :P --erikD 23:11, 2 October 2005 (UTC)[reply]

Reversing Wikipedia[edit]

Dear Alex,

Gidday! How are you?

I see you integrated my Wikipedia entry for the Wagon-wheel effect into the entry for Reverse rotation effect. I've never been sure how to send you a message via Wikipedia, but here goes. I'm going to give you four reasons that I hope will persuade you to undo the change:

First, "reverse rotation effect" is essentially unknown in the scientific literature. I searched for it in PsycINFO, Medline, and Science Citation Index and did not find a single instance. The same search for "wagon wheel effect" yielded 4, 3, and 6 references respectively.

Second, if you exclude hits for the Wikipedia article and its copies, a Google search for "reverse rotation effect" yielded fewer hits than for "wagon wheel effect".

Third, "reverse rotation effect" is subordinate category of the wagon wheel effect, rather than vice versa. That is, a wagon wheel, or any rotating object, can appear to rotate in the reverse direction from its real rotation, it can appear to be stationary, or it can appear to rotate in the same direction as its real rotation but more slowly, whereas a reverse rotation effect can be only the first of these possibilities. In order from most general to most specific we could have:

1. Alaising

1.1 Spatial aliasing

1.2 Temporal aliasing

1.2.1 Apparent movement (also known as stroboscopic movement)

1.2.2 Stroboscopic effects The WWE RRE Illusory stationarity Slow rotation

Fourth (and this is the only reason involving naked self interest!), the entry for Reverse rotation effect was pretty minimal and poorly written prior to your bringing in my sparking prose. But the history of that entry makes it hard to find my input. As an academic, I care about correct attribution; a reversion would restore it.

Have I convinced you?

Robert P. O'Shea 03:58, 18 November 2005 (UTC)[reply]