Does a Single Instance of rel="nofollow" cause all instances on a page to be nofollowed?

[brycebertola]

I attended the Bruce Clay training at SMX Advanced Seattle, and he mentioned link pruning/sculpting (here's an SEOMoz article about it - http://www.seomoz.org/blog/google-says-yes-you-can-still-sculpt-pagerank-no-you-cant-do-it-with-nofollow)

Now during his presentation he mentioned that if you have one page with multiple links leading to another page, and one of those links is nofollowed, it could cause all links to be nofollowed.

Example:

Page A has 4 links to Page B: 1:followed, 2:followed, 3:nofollowed, 4:followed

The presence of a single nofollow tag would override the 3 followed links and none of them would pass link juice.

Has anyone else encountered this problem, and Is there any evidence to support this? I'm thinking this would make a great experiment.

[sferrino]

I have had an instance where the upper menu had a nofollow, but the lower footer links did not and it didn't seem to matter, juice still went through. This was not the intention as one of them were overlooked.

[Francisco_Meza]

maybe a NO INDEX, NO FOLLOW would cause it. But I don't think a no follow external link would cause the others to turn into no follows.

[marcelo-275398]

has anyone got any further information or evidence about this ? I was under the impression its handled on a per link basis.