During this weekend's mini camp, the 49ers are experimenting with the new rule that allows a headset in the helmet of one defensive player.
"It's just to get a few of them comfortable to hearing it," said head coach Mike Nolan.
Nolan indicated that some of his linebackers and safeties were all sampling the headset including Dashon Goldson, Michael Lewis and Mark Roman.
"We get the call quick enough to where if we don't like the call that is out there we can change it," said Roman. "That's something that was hard to do before. You'd be scrambling and not really get set until the ball was almost snapped."
Defensive coordinator Greg Manusky had said a few weeks ago that he thought Nate Clements or Patrick Willis would end up wearing the headset since the pair played the most snaps last season, but at this point Nolan would just like to get several players familiar with the process.
Linebacker Shaun Richardson (groin) did not practice in the morning session, joining David Baas, Joe Cohen, Manny Lawson, and Melvin Oliver.
There was a brief squabble between center Cody Wallace and defensive tackle Ron Fields in the morning session that was quickly broken up.
Wide receiver Isaac Bruce continues to haul in everything in sight, diving and leaping if need be to come down with the catch as if it were a playoff game and not just mini camp.
The rookie out of Virginia Tech Josh Morgan also got open a few times and made some nice grabs and run after the catch moves for extra yardage.
Afternoon Update: The 49ers coaching staff opted to sit out WR Isaac Bruce in the afternoon practice to rest the veteran receiver.
Safety Dashon Goldson notched an interception for the defensive highlight, while rookie guard Chilo Rachal impressed his offensive teammates when he showed some burst getting downfield to block on a screen pass.