With 24.4 seconds left in the Mavericks' 93-81 win over the Lakers, Artest reached out with his right hand and grabbed Barea by the face and essentially clotheslined him. Artest was immediately ejected after picking up his second technical foul.
The foul was classified a flagrant foul 2. Artest was out of position and had to run through Odom to get to Barea, who took a minute to recover before making two free throws to seal the Mavs' victory.
Artest will miss Friday's Game 3 in Dallas, with the Mavericks leading the best-of-seven series 2-0.
"I have no reaction," Artest said after Thursday's practice. "I'm ready to move forward and play basketball."
Barea agreed with the league's decision Thursday.
"I think one game is fine," Barea said during an appearance on ESPN 103.3's Galloway and Company. "The league didn't like that it was to the face and it was after the play was called. That's never going to be good with the league. They're making a point and he was suspended for one game."
Lakers coach Phil Jackson said Thursday he had not spoken to Artest regarding the suspension, but the Lakers planned to petition the league to rescind the first technical Artest was called for with 3:32 to go in the second quarter after he had been called for a personal foul on Tyson Chandler.
"That was a miscall in that process," Jackson said Thursday.
The coach also said Artest let the disappointing impending loss affect his decision-making down the stretch.
"Ron was really trying to work hard," Jackson said. "He got an offensive foul in a rebounding situation right before that where he chased the ball down and in the process kind of ran right into the bench. So, I could see he was getting animated about losing and those are things we have to kind of watch."
Artest had an excellent first round against New Orleans, averaging 11.8 points on 50 percent shooting, but his production dipped to 6.5 points through the first two games against Dallas on 27.8 percent shooting.
"It's not about what we're going to miss," Artest said. "It's about what we're going to do."
Jackson would not reveal what he is going to do to the starting lineup to fill in the void at small forward left by Artest.
"I'll kind of hold that," Jackson said.
Matt Barnes likely will start in Artest's place, keeping L.A.'s rotation of big men intact with Lamar Odom coming off the bench. Luke Walton, who has yet to play in this year's playoffs, could fill in as a backup and Kobe Bryant can be used as a small forward as well.
Barnes' averages have dwindled to 3.4 points and 2.8 rebounds in 13.5 minutes per game in the playoffs, down from 6.7 points and 4.3 rebounds in 19.2 minutes per game in the regular season.
But Odom was prepared to start should he get the assignment.
"You start from outside [at small forward] rather than start from inside [at power forward]," Odom said. "Usually we try to just have our bigs go from the post to the corner and that's about it. The defensive rotations are just a lot different. ... I'm not sure who he's going to go with. Just in case, I'll be ready."
Information from ESPNLosAngeles.com's Arash Markazi and Dave McMenamin and ESPNDallas.com's Tim MacMahon was used in this report.