With the recent update to Photoshop CS6, several tools and features were modified or removed - two of them being the Extract filter and the Turbulence tool.
The Extract filter has been replaced by the Refine Edge feature in Photoshop CS6 (source). This is a very powerful non-destructive alternative to the Extract filter in previous versions of Photoshop.
The Turbulence tool has unfortunately been elimitated in this version of Photoshop (source).
You can read more about the new Extract tool and watch a few tutorial videos here: http://feedback.photoshop.com/photoshop_family/topics/where_did_the_ex tract_filter_go_in_photoshop_cs5-12e7w3
Hewllo kendall,Thank you for your e-mail,I have not yet looked at Refine Edge,but will do so inthe very near future.As to Turbulence it is a bit disappointing to find that it had been deletedin C.S.6 as I found it to be extremely useful for certain effects which cannot be obtained from the other tools.