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PSYART  March 2011, Week 3

PSYART March 2011, Week 3

Subject:

Re: A neurological cure for anxiety/ neurological effects of poverty

From:

Murray Schwartz <[log in to unmask]>

Reply-To:

Discussion Group for Psychology and the Arts <[log in to unmask]>

Date:

Sat, 19 Mar 2011 09:36:21 -0400

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (149 lines)

Deisseroth's aim is to "understand psychiatric symptoms better" in order to "regulate" them.  The meanings of these symptoms (and the definition of a symptom in the first place) is not his concern, but it is the concern of psychoanalysts dealing with individuals and groups.  What is "cured" when the symptom is regulated by optogenic means?  

Warm regards, Murray
________________________________________
From: Discussion Group for Psychology and the Arts [[log in to unmask]] On Behalf Of Dianne Hunter [[log in to unmask]]
Sent: Friday, March 18, 2011 9:13 AM
To: [log in to unmask]
Subject: Re: A neurological cure for anxiety/ neurological effects of poverty

Cf. essay in the current NEW YORKER on the effects of poverty in producing anxiety and its neurological effect on children, who later in life manifest physical and mental disease.
On Mar 16, 2011, at 5:35 PM, Norman Holland wrote:

Hi, all,

This optogenetic cure works better in mice than the talking cure.

                      --With warm regards,

                                   Norm
Norman Holland



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Shutting Off Anxiety







With the flick of a genetic light switch, researchers have reduced symptoms of anxiety in laboratory mice almost instantaneously by manipulating the activity of specific neurons in the brain.




Anxiety is the most common psychiatric disease, but little is known about the underlying neural circuits. Howard Hughes Medical Institute (HHMI) early career scientist Karl Deisseroth and his colleagues used a set of research tools developed in his lab that enables use of light to control neural activity in a very precise way. Using this technique, the researchers have found that a cluster of neurons in the amygdala -- an almond-shaped structure in the brain -- contribute to the control of apprehension in the absence of any immediate threat. They found that two distinct neural circuits within the amygdala have opposing effects on anxiety, and that manipulating the activity of those pathways elicits strikingly rapid effects on anxiety-related behaviors in mice.




[http://www.hhmi.org/news/media/23931.jpg]
With optogenetics, researchers can use light to control the activity of specific cells in the brains of mice.
Photo: Karl Deisseroth

The findings, published online March 9, 2011, in the journal Nature, begin to clarify the biological basis of a mental disorder that is often associated with unnecessary stigma that Deisseroth says can make people afflicted by it reluctant to seek treatment. “The more we understand how something really works biologically, the more it has a profound effect on the patients and on the families and on society, because it points to the physical and real nature of the disorder,” he says.

“What we actually found was something that could not have been identified by any earlier method,” he says.

About six years ago, Deisseroth, a psychiatrist and neuroscientist at Stanford University, found himself becoming increasingly frustrated with the lack of rigorous, scientific understanding of the neural basis of mental health disorders. So he set out to equip researchers with the tools they needed to tease out exactly how individual neurons in the brain communicate with one another. Deisseroth reasoned that understanding more about how neurons communicate would likely lead to new insights about disorders of the brain and central nervous system. The method he developed, called optogenetics, introduces light-sensitive proteins from algae and bacteria into targeted sets of cells so that scientists can switch those cells on and off with a pulse of light.


Stimulating specific pathways in the brain of a mouse can alter its anxiety-related behavior, such as how much time it spends exploring open areas. The session shown is divided into three epochs, and light stimulation is delivered to the BLA terminals in the CeA via an optical fiber only during the second epoch, as indicated by the appearance of the blue text detailing light stimulation parameters.
Video: Karl Deisseroth

The technique has already proven valuable in a variety of research applications. When expressed in animals, the light-sensitive channels can be used to excite or inhibit the activity of neurons, and thus regulate diverse behaviors such as movement, depression, drug addiction and fear. “I always am amazed by how remarkable it is that we’ve been able to take these tools from algae and come to a deeper understanding of ourselves as mammals,” Deisseroth says. But this latest work on the neural circuits that control anxiety, he says, has been particularly satisfying.

“It’s a culminating moment for me,” he says. “The whole reason I started the optogenetic strategy was to try to understand and to probe neural circuits with better precision in order to help us understand psychiatric symptoms better.”

Traditional methods of controlling neural activity in the brain, such as driving bursts of activity with electrodes, are not very precise. They typically control cells that are physically clustered near one another, but may not be of the same type. And fine-tuning these types of studies is simply not possible. “If you introduce an electrode, that certainly doesn’t distinguish one kind of axon, or wire of communication, from another in the brain,” Deisseroth says.

With the invention of optogenetic techniques, Deisseroth and others have opened the way for much more focused research on brain activity. In the new study, Deisseroth and his team used the approach to disentangle the roles of separate circuits within the amygdala. Although past studies have demonstrated that anxious people show greater activity in this brain region and animals that lack it do not exhibit normal fear responses, little is known about the cellular pathways that govern anxiety.


“The whole reason I started the optogenetic strategy was to try to understand and to probe neural circuits with better precision in order to help us understand psychiatric symptoms better.”
Karl Deisseroth

To examine this question, Deisseroth expressed light-sensitive channelrhodopsin proteins in the basolateral amygdala of mice. These neurons send projections to another area of the amygdala called the central nucleus. Exciting projections that connected the basolateral amygdala to the central nucleus of the amygdala activated only one pathway that reduces apprehension. When the researchers turned on these connections by shining blue light on these projections, they found that mice showed fewer signs of worry: They spent more time exploring open areas in standard tests of anxiety. When the researchers instead shut off the connections with a yellow light, they noticed that the mice were more nervous. In contrast, shining light on the bodies of the basolateral amygdala cells had little effect on the animals’ behavior, since this activated the cells’ connections to pathways that both trigger and inhibit anxiety, essentially canceling out one another.

The near-instantaneous, bidirectional control of anxiety that they were able to achieve with optogenetics surprised Deisseroth, he said. “Most thinking [in the field] had suggested that anxiety was a very stable state in the brain,” he says. “What we found is that it’s really something that’s under real-time continuous control.”

The ability to manage one’s level of apprehension and quickly change it depending on external circumstances is critical. “The more different pathways you have that deliver different kinds of anxiety control, the more you can finely regulate it and adapt the organism’s heightened state to the situation,” Deisseroth says. “It’s a wonderful design because it provides a lot of opportunities for regulation.”



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January 2006, Week 4
January 2006, Week 3
January 2006, Week 2
January 2006, Week 1
December 2005, Week 5
December 2005, Week 3
December 2005, Week 2
December 2005, Week 1
November 2005, Week 5
November 2005, Week 4
November 2005, Week 3
November 2005, Week 2
November 2005, Week 1
October 2005, Week 5
October 2005, Week 4
October 2005, Week 3
October 2005, Week 2
October 2005, Week 1
September 2005, Week 5
September 2005, Week 4
September 2005, Week 3
September 2005, Week 2
September 2005, Week 1
August 2005, Week 5
August 2005, Week 4
August 2005, Week 3
August 2005, Week 2
August 2005, Week 1
July 2005, Week 5
July 2005, Week 4
July 2005, Week 3
July 2005, Week 2
July 2005, Week 1
June 2005, Week 4
June 2005, Week 3
June 2005, Week 2
June 2005, Week 1
May 2005, Week 4
May 2005, Week 3
May 2005, Week 2
May 2005, Week 1
April 2005, Week 5
April 2005, Week 4
April 2005, Week 3
April 2005, Week 2
April 2005, Week 1
March 2005, Week 5
March 2005, Week 4
March 2005, Week 3
March 2005, Week 2
March 2005, Week 1
February 2005, Week 4
February 2005, Week 3
February 2005, Week 2
February 2005, Week 1
January 2005, Week 5
January 2005, Week 4
January 2005, Week 3
January 2005, Week 2
January 2005, Week 1
December 2004, Week 5
December 2004, Week 4
December 2004, Week 3
December 2004, Week 2
December 2004, Week 1
November 2004, Week 5
November 2004, Week 4
November 2004, Week 3
November 2004, Week 2
November 2004, Week 1
October 2004, Week 5
October 2004, Week 4
October 2004, Week 3
October 2004, Week 2
October 2004, Week 1
September 2004, Week 5
September 2004, Week 4
September 2004, Week 3
September 2004, Week 2
September 2004, Week 1
August 2004, Week 5
August 2004, Week 3
August 2004, Week 2
August 2004, Week 1
July 2004, Week 5
July 2004, Week 4
July 2004, Week 3
July 2004, Week 2
July 2004, Week 1
June 2004, Week 4
June 2004, Week 3
June 2004, Week 2
June 2004, Week 1
May 2004, Week 5
May 2004, Week 4
May 2004, Week 3
May 2004, Week 2
May 2004, Week 1
April 2004, Week 5
April 2004, Week 4
April 2004, Week 3
April 2004, Week 2
April 2004, Week 1
March 2004, Week 5
March 2004, Week 4
March 2004, Week 3
March 2004, Week 2
March 2004, Week 1
February 2004, Week 4
February 2004, Week 3
February 2004, Week 2
February 2004, Week 1
January 2004, Week 5
January 2004, Week 4
January 2004, Week 3
January 2004, Week 2
January 2004, Week 1
December 2003, Week 5
December 2003, Week 4
December 2003, Week 3
December 2003, Week 2
December 2003, Week 1
November 2003, Week 5
November 2003, Week 4
November 2003, Week 3
November 2003, Week 2
November 2003, Week 1
October 2003, Week 5
October 2003, Week 4
October 2003, Week 3
October 2003, Week 2
October 2003, Week 1
September 2003, Week 5
September 2003, Week 4
September 2003, Week 3
September 2003, Week 2
September 2003, Week 1
August 2003, Week 5
August 2003, Week 4
August 2003, Week 3
August 2003, Week 2
August 2003, Week 1
July 2003, Week 5
July 2003, Week 4
July 2003, Week 3
July 2003, Week 2
July 2003, Week 1
June 2003, Week 4
June 2003, Week 3
June 2003, Week 2
June 2003, Week 1
May 2003, Week 5
May 2003, Week 4
May 2003, Week 3
May 2003, Week 2
May 2003, Week 1
April 2003, Week 5
April 2003, Week 4
April 2003, Week 3
April 2003, Week 2
April 2003, Week 1
March 2003, Week 5
March 2003, Week 4
March 2003, Week 3
March 2003, Week 2
March 2003, Week 1
February 2003, Week 4
February 2003, Week 3
February 2003, Week 2
February 2003, Week 1
January 2003, Week 5
January 2003, Week 4
January 2003, Week 3
January 2003, Week 2
January 2003, Week 1
December 2002, Week 5
December 2002, Week 4
December 2002, Week 3
December 2002, Week 2
December 2002, Week 1
November 2002, Week 5
November 2002, Week 4
November 2002, Week 3
November 2002, Week 2
November 2002, Week 1
October 2002, Week 5
October 2002, Week 4
October 2002, Week 3
October 2002, Week 2
October 2002, Week 1
September 2002, Week 5
September 2002, Week 4
September 2002, Week 3
September 2002, Week 2
September 2002, Week 1
August 2002, Week 5
August 2002, Week 4
August 2002, Week 3
August 2002, Week 2
August 2002, Week 1
July 2002, Week 5
July 2002, Week 4
July 2002, Week 3
July 2002, Week 2
June 2002, Week 4
June 2002, Week 3
June 2002, Week 2
June 2002, Week 1
May 2002, Week 5
May 2002, Week 4
May 2002, Week 3
May 2002, Week 2
May 2002, Week 1
April 2002, Week 5
April 2002, Week 4
April 2002, Week 3
April 2002, Week 2
April 2002, Week 1
March 2002, Week 5
March 2002, Week 4
March 2002, Week 3
March 2002, Week 2
March 2002, Week 1
February 2002, Week 4
February 2002, Week 3
February 2002, Week 2
February 2002, Week 1
January 2002, Week 5
January 2002, Week 4
January 2002, Week 3
January 2002, Week 2
January 2002, Week 1
December 2001, Week 5
December 2001, Week 4
December 2001, Week 3
December 2001, Week 2
December 2001, Week 1
November 2001, Week 5
November 2001, Week 4
November 2001, Week 3
November 2001, Week 2
November 2001, Week 1
October 2001, Week 5
October 2001, Week 4
October 2001, Week 3
October 2001, Week 2
October 2001, Week 1
September 2001, Week 5
September 2001, Week 4
September 2001, Week 3
September 2001, Week 2
September 2001, Week 1
August 2001, Week 5
August 2001, Week 4
August 2001, Week 3
August 2001, Week 2
August 2001, Week 1
July 2001, Week 4
July 2001, Week 3
July 2001, Week 2
July 2001, Week 1
June 2001, Week 5
June 2001, Week 4
June 2001, Week 3
June 2001, Week 2
June 2001, Week 1
May 2001, Week 5
May 2001, Week 4
May 2001, Week 3
May 2001, Week 2
May 2001, Week 1
April 2001, Week 5
April 2001, Week 4
April 2001, Week 3
April 2001, Week 2
April 2001, Week 1
March 2001, Week 5
March 2001, Week 4
March 2001, Week 3
March 2001, Week 2
March 2001, Week 1
February 2001, Week 4
February 2001, Week 3
February 2001, Week 2
February 2001, Week 1
January 2001, Week 5
January 2001, Week 4
January 2001, Week 3
January 2001, Week 2
January 2001, Week 1
December 2000, Week 5
December 2000, Week 4
December 2000, Week 3
December 2000, Week 2
December 2000, Week 1
November 2000, Week 5
November 2000, Week 4
November 2000, Week 3
November 2000, Week 2
November 2000, Week 1
October 2000, Week 5
October 2000, Week 4
October 2000, Week 3
October 2000, Week 2
October 2000, Week 1
September 2000, Week 5
September 2000, Week 4
September 2000, Week 3
September 2000, Week 2
September 2000, Week 1
August 2000, Week 5
August 2000, Week 4
August 2000, Week 3
August 2000, Week 2
August 2000, Week 1
July 2000, Week 5
July 2000, Week 4
July 2000, Week 2
July 2000, Week 1
June 2000, Week 5
June 2000, Week 4
June 2000, Week 3
June 2000, Week 2
June 2000, Week 1
May 2000, Week 5
May 2000, Week 4
May 2000, Week 3
May 2000, Week 2
May 2000, Week 1
April 2000, Week 5
April 2000, Week 4
April 2000, Week 3
April 2000, Week 2
April 2000, Week 1
March 2000, Week 5
March 2000, Week 4
March 2000, Week 3
March 2000, Week 2
March 2000, Week 1
February 2000, Week 4
February 2000, Week 3
February 2000, Week 2
February 2000, Week 1
January 2000, Week 5
January 2000, Week 4
January 2000, Week 3
January 2000, Week 2
January 2000, Week 1
December 1999, Week 5
December 1999, Week 4
December 1999, Week 3
December 1999, Week 2
December 1999, Week 1
November 1999, Week 5
November 1999, Week 4
November 1999, Week 3
November 1999, Week 2
November 1999, Week 1
October 1999, Week 5
October 1999, Week 4
October 1999, Week 3
October 1999, Week 2
October 1999, Week 1
September 1999, Week 5
September 1999, Week 4
September 1999, Week 3
September 1999, Week 2
September 1999, Week 1
August 1999, Week 5
August 1999, Week 4
August 1999, Week 3
August 1999, Week 2
July 1999, Week 5
July 1999, Week 4
July 1999, Week 3
June 1999, Week 4
June 1999, Week 3
June 1999, Week 2
June 1999, Week 1
May 1999, Week 5
May 1999, Week 4
May 1999, Week 3
May 1999, Week 2
April 1999, Week 5
April 1999, Week 4
April 1999, Week 3
April 1999, Week 2
April 1999, Week 1
March 1999, Week 5
March 1999, Week 4
March 1999, Week 3
March 1999, Week 2
March 1999, Week 1
February 1999, Week 4
February 1999, Week 3
February 1999, Week 2
February 1999, Week 1
January 1999, Week 5
January 1999, Week 4
January 1999, Week 3
January 1999, Week 2
January 1999, Week 1
December 1998, Week 5
December 1998, Week 4
December 1998, Week 3
December 1998, Week 2
December 1998, Week 1
November 1998, Week 5
November 1998, Week 4
November 1998, Week 3
November 1998, Week 2
November 1998, Week 1
October 1998, Week 5
October 1998, Week 4
October 1998, Week 3
October 1998, Week 2
October 1998, Week 1
September 1998, Week 5
September 1998, Week 4
September 1998, Week 3
September 1998, Week 2
September 1998, Week 1
August 1998, Week 4
August 1998, Week 3
August 1998, Week 2
August 1998, Week 1
July 1998, Week 4
July 1998, Week 3
July 1998, Week 2
July 1998, Week 1
June 1998, Week 5
June 1998, Week 4
June 1998, Week 3
June 1998, Week 2
June 1998, Week 1
May 1998, Week 5
May 1998, Week 4
May 1998, Week 3
May 1998, Week 2
May 1998, Week 1
April 1998, Week 5
April 1998, Week 4
April 1998, Week 3
April 1998, Week 2
April 1998, Week 1
March 1998, Week 5
March 1998, Week 4
March 1998, Week 3
March 1998, Week 2
March 1998, Week 1
February 1998, Week 4
February 1998, Week 3
February 1998, Week 2
February 1998, Week 1
January 1998, Week 5
January 1998, Week 4
January 1998, Week 3
January 1998, Week 2
January 1998, Week 1
December 1997, Week 5
December 1997, Week 4
December 1997, Week 3
December 1997, Week 2
December 1997, Week 1
November 1997, Week 4
November 1997, Week 3
November 1997, Week 2
November 1997, Week 1
October 1997, Week 5
October 1997, Week 4
October 1997, Week 3
October 1997, Week 2
October 1997, Week 1
September 1997, Week 5
September 1997, Week 4
September 1997, Week 3
September 1997, Week 2
September 1997, Week 1
August 1997, Week 5
August 1997, Week 4
August 1997, Week 3
August 1997, Week 2
August 1997, Week 1
July 1997, Week 4
July 1997, Week 3
July 1997, Week 2
June 1997, Week 4

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