''Motherf---er, are you ADHD?'' That's what N.E.R.D. ask on ''Anti-Matter.'' It's a question that can be thrown back at Pharrell Williams, Chad Hugo, and Shae Haley, given third LP Seeing Sounds' dizzyingly and at times fantastically short attention span. ''Anti-Matter'' sets rap to Jack White-style guitar fuzz; ''Windows'' suggests what it'd be like if Gnarls Barkley covered ''My Sharona''; and the ballad ''Sooner or Later'' climaxes in a Prince-ly guitar solo. In their hyperkinetic hands, even integrating an acoustic stand-up bass with electronic beats (''Yeah You'') seems perfectly natural. B+
DOWNLOAD THIS: Hear a preview clip of ''You Know What'' at mtv.com

