Friday, March 19, 2010

Friday, March 12, 2010

Brain replays control decision-making process

Replaying recent events in the hippocampus of the brain has more to do with active decision-making process than with creating long-term memories, according to a new study.

Conducted by researchers at Carnegie Mellon University and the University of Minnesota Medical School, the study of rats navigating a maze found that replays occurring in the hippocampus were not necessarily recent or frequent paths through the maze, as would be expected if the event was being added to memory.

On the other hand, the replays often were paths that the rats had rarely taken or, in some cases, had never taken, as if the rats were trying to build maps to help them make better navigation decisions.

Dr. Anoopum Gupta, and his colleagues said that their findings suggest replays in the hippocampus are not merely passive echoes of past events, but part of a complex, active process of decision-making.

"Our work provides clues into how animals construct a complete, fully navigable representation of their environment, even if they’ve only partially explored that environment. The cognitive maps created in this way may allow animals to plan novel routes or shortcuts. As we learn more about the neural mechanisms that enable animals to flexibly navigate through the world, we hope to apply those lessons to research in robotics that could improve autonomous navigation systems," said Gupta.

The team used electrode ‘hats’ to record brain activity of rats as they navigated a maze. In particular, they monitored certain neurons, called place cells, which fire in response to physical locations.

That enabled the researchers to identify where an event that was being replayed was located based on which place cells were firing.

During an experiment, a rat might be in one portion of the maze, while the firing of place cells in the hippocampus indicated that the rat was replaying information about a different location.

On a task with two behavioral sequences, A and B, the researchers found that the animals would replay sequence B more often though they spent most of their time running sequence A.

This meant that the rats were most likely to replay the path they had experienced less often, which indicated that replay is not just a function of helping an animal remember what it has experienced most frequently or most recently, but an important function in helping it map its whole environment.

During the replay process, the research team also was able to observe the animal making connections between paths that it had never physically traveled before.

This further suggested that replay plays a role in helping an animal learn and maintain the entire map of its environment and make connections within it.

The rats were not just reviewing recent experience to move it to long-term memory.

The study was published in the journal Neuron.

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Maze Portrait Of Michalangelo's David

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Maze of Lily Allen


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Tuesday, March 9, 2010

Team of Monkeys Maze: Revenge on the Man in the Yellow hat and Tattoo Teams, Created by Yonatan Frimer

Team Of Monkeys Revenge on the Man with The Yellow Hat

Team Of Monkeys Maze By Y.Frimer & RSL
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Curious George was never forgiven or forgotten.
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Team of monkey tattoo artist, created by Yontan Frimer
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Wednesday, March 3, 2010

Home finale for three Vols By: Wes Rucker

Home finale for three Vols By: Wes Rucker (source article)

KNOXVILLE -- What was intended to be a simple video e-mail message to the University of Tennessee turned into cut-down comedy hour.

UT senior basketball players Wayne Chism, Bobby Maze and J.P. Prince were asked merely to speak into the camera, thank students for their support this season and encourage them to attend senior night festivities before tonight's game against Arkansas.

Part of the senior night promotion includes free headbands to students, many of whom plan to wear them awkwardly high atop their heads in a tribute to Chism's self-described "yarmulke."

But the cameraman made a mistake. He didn't give the players a script.

"Come get your free headband," Chism said. "We're all going to wear one."

Tennessee's Wayne Chism (4) shoots past Florida's Alex Tyus (23) during the second half of an NCAA college basketball game Sunday, Jan. 31, 2010, in Knoxville, Tenn. Chism is a senior this year. (AP Photo/Wade Payne)

"Umm ... I'm not," Prince interrupted. "You couldn't pay me to wear one."

"Just because your head's too big," Maze responded. "We'd need a slingshot to get one on your big ol' head."

"My head's smaller than either of your nostrils," Prince shot back. "Your nasal strip would be bigger than my headband. When you sneeze, everyone in this arena gets wet."

Without blinking, Maze then wondered aloud whether students should get Prince's acne medication to go along with their Chism headbands.

Not to be outdone, Chism simply offered, "Y'all both ugly."

A normal video wouldn't have seemed appropriate, given the circuitous routes UT's seniors have taken to arrive at this point.

Chism, a four-star prospect and Pearl's first high-profile recruiting commitment to the Vols, is the only man left from the star-studded 2007 signing class. Tyler Smith, a Tennessee native who transferred to UT and became an All-Southeastern Conference forward and team captain, was on track to be honored tonight before getting dismissed from the program in January.

"I don't even know how to answer that question right now," Chism said regarding the losses of Smith and former classmates Duke Crews, Ramar Smith, Josh Tabb and Marques Johnson. "It's crazy, though. I mean, I came in with a lot of people, and through the times we've been here a lot of people have came and gone. Being the one left on senior night is kind of disappointing, but I know the guys are out there doing something better with their lives.

"They're still my brothers, and I still love and care about them."

Some left Chism's class, but others arrived, too.

Prince -- also a Tennessean -- transferred to UT in time to play three mostly successful seasons for the Vols.

Maze, a former Baltimore-area high school star, arrived last year after two seasons at Oklahoma and Hutchinson (Kan.) Community College.

"Everybody's got a story, but all that matters is that we came to Tennessee, we became a family and we won a lot of big basketball games," Maze said. "And those of us still here are going to leave with our heads held high."

Prince and Chism said they'd rather focus on Arkansas than get too caught up in senior night emotions.

"It's my last time playing here, but I don't want to make more out of it than it is right now," Prince said. "I've had some great times here, and we've won a lot of games in front of a lot of a great fans, and I'm going to miss it one day. But stuff like that won't hit me until years from now.

"I don't want to think about it too much right now, but you just want to leave the place better than when you came here, and I think we've done a good job of that. I'm proud of what we've done."

Chism opened up a little bit more than Prince.

"I kind of thought about it yesterday," Chism said. "I was like, 'Yeah, I'm just about to play my last home game.' It came pretty fast, so I was like, 'Wow.' But not excited."

After a slight nudge, the quirky big man said he's already seen the fruits of his UT labor.

"When you look back, you'd see all the orange seats were kind of empty back then, and you'd only see some people there at the games," said Chism, who has played more games than any Vol in history and is on track to graduate in May with a double major. "It was like, is it a D-II school or what? It's supposed to be a D-I school, it turned around when Coach Pearl got here -- and our first signees for him -- and then a lot of things changed from there. That gym became packed every game. Every game started being sold out because of the way Coach Pearl has turned this team around, and he's still doing it.

"I'm very proud. Back when I was in high school, people always said, 'Man, you shouldn't go to Tennessee.' Now when I go back home, everybody's a Tennessee fan."

Maze was the most openly emotional of the trio. That's not surprising, considering the point guard came to UT with a less-than-stellar reputation off the floor but is on pace to leave in May as a two-year starter who graduated and made the honor roll with a 3.5 senior-year GPA.

"This place means everything to me," Maze said. "Tennessee gave me a chance to change my identity and what people thought about me. When I was at Oklahoma, I was young and immature and got into a little bit of trouble and made some bad decisions. But since I've been here, there's been a total change. I haven't been in any off-the-court issues. I haven't been in any trouble. I'm going to graduate. I've changed my whole life around.

"I think of my two years here as a blessing; a changing point in life, a transition from a boy into a man. I will remember that my whole life."

But tonight ends the seniors' home careers only. They potentially have several more weeks to play.

"Nobody can ever take away that we beat the No. 1 and No. 2 teams in the nation my senior year ... but we're not done yet," Maze said. "I want to come back here one day and be able to show my children hopefully a picture of my team and me, and I can tell them, 'Look what I was a part of.'

"Hopefully we can earn a big banner for this place, too."

Other contacts for Wes Rucker are www.twitter.com/wesrucker and www.facebook.com/tfpvolsbeat.


Click to see some other cool mazes

Communist Maze:

Maze of Team of Monkeys AAA - Jumper Cables

From the album:

Team Of Monkeys Jumper Cables
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