Monday, May 11, 2009

"Higher" emotions have neural correlates too

Check out this post at Deric Bowds Mindblog, Brain correlates of self-transcendent emotions, based on this paper by a group which includes the Damasios: Neural correlates of admiration and compassion.

Bownds writes:
"Antonio and Hanna Damasio and collaborators have now observed brain activities associated with our internal loftier emotions that transcend self-interest, such as elevation and admiration. These are hard to measure because they don't correlate obviously with facial expressions or body language."


Writers at PNAS (again, from Deric's blogpost) provide an overview, put the paper into context:
"Emotion research has something in common with a drunk searching for his car keys under a street lamp. ‘‘Where did you lose them?’’ asks the cop. ‘‘In the alley,’’ says the drunk, ‘‘but the light is so much better over here.’’ For emotion research, the light shines most brightly on the face, whose movements can be coded, compared across cultures, and quantified by electromyography. All of the ‘‘basic’’ emotions described by Paul Ekman and others (happiness, sadness, anger, fear, surprise, and disgust) earned their place on the list by being face-valid. The second source of illumination has long been animal research. Emotions that can be reliably triggered in rats, such as fear and anger, have been well-studied, down to specific pathways through the amygdala. But emotions that cannot be found on the face or in a rat, such as moral elevation and admiration, are largely abandoned back in the alley. We know they are there, but nobody can seem to find a flashlight. It is therefore quite an achievement that Immordino-Yang, McCall, Damasio, and Damasio managed to drag an fMRI scanner back there and have given us a first glimpse of the neurological underpinnings of elevation and admiration."


My bold.
Here is the abstract of the paper itself;

Abstract

In an fMRI experiment, participants were exposed to narratives based on true stories designed to evoke admiration and compassion in 4 distinct categories: admiration for virtue (AV), admiration for skill (AS), compassion for social/psychological pain (CSP), and compassion for physical pain (CPP). The goal was to test hypotheses about recruitment of homeostatic, somatosensory, and consciousness-related neural systems during the processing of pain-related (compassion) and non-pain-related (admiration) social emotions along 2 dimensions: emotions about other peoples' social/psychological conditions (AV, CSP) and emotions about others' physical conditions (AS, CPP). Consistent with theoretical accounts, the experience of all 4 emotions engaged brain regions involved in interoceptive representation and homeostatic regulation, including anterior insula, anterior cingulate, hypothalamus, and mesencephalon. However, the study also revealed a previously undescribed pattern within the posteromedial cortices (the ensemble of precuneus, posterior cingulate cortex, and retrosplenial region), an intriguing territory currently known for its involvement in the default mode of brain operation and in self-related/consciousness processes: emotions pertaining to social/psychological and physical situations engaged different networks aligned, respectively, with interoceptive and exteroceptive neural systems. Finally, within the anterior insula, activity correlated with AV and CSP peaked later and was more sustained than that associated with CPP. Our findings contribute insights on the functions of the posteromedial cortices and on the recruitment of the anterior insula in social emotions concerned with physical versus psychological pain.

I deliberately bolded the bit about the anterior insula, because of how involved it seems to be in pain production or at least pain perception.

Sunday, April 19, 2009

Thursday, March 12, 2009

The ABCDEFGHI of Persisting Pain

Here is a link to a write-up I did recently on the topic:

The ABCDEFGHI of Persisting Pain.

I hope it is helpful to anyone who has any.

Saturday, February 7, 2009

"Scans for Back Pain Ineffective"

Tara Parker-Pope published this article yesterday in the NYT: Scans for Back Pain Ineffective

She can say that again. Not only does the scanning or imaging process do nothing whatever for the "pain", it may result in misleading interpretations of the imaging; well-meaning people may consider or resort to treatments that reinforce the problem rather than help the pain experience to disappear.

Excerpts:

"Researchers from Oregon Health and Science University in Portland reviewed six clinical trials comprised of nearly 2,000 patients with lower back pain. They found that back pain patients who underwent scans didn’t get better any faster or have less pain, depression or anxiety than patients who weren’t scanned. More important, the data suggested that patients who get scanned for back pain may end up with more pain than those who are left alone, according to the report published this week in the medical journal Lancet."
"The problem, say researchers, is that back scans can turn up physical changes in the back that aren’t really causing any problem."
“You can find lots of stuff on X-rays and M.R.I.’s like degenerative disks and arthritis, but these things are very weakly correlated with low back pain,” said study author Dr. Roger Chou, associate professor of medicine at Oregon Health. “We think we’re helping patients by doing a test, but we’re adding cost, exposing people to radiation and people may be getting unnecessary surgery. They start to think of themselves as having a horrible back problem and they stop doing exercise and things that are good for them, when in reality, a lot of people have degenerative disks and arthritis and have no pain at all.”

I completely agree. In addition to unnecessary surgery, they may be getting unnecessary manipulation and other "treatment" which is focused on supposedly misbehaving mesodermal derivatives instead of helping the ectodermal derivatives (i.e., skin, nerves, brain, embedded "I"- illusion) all learn to get along better.

Monday, January 12, 2009

Swiss neuroprostheses explorations

Over at the BrainSciencePodcast forum, a listener, jezcentral, contributed this link:

Launching of EPFL Center for Neuroprostheses

Excerpt:
"What's a neuroprosthesis? It's a device made up of sensors, connections and electronic chips that are embedded in the body to repair certain neurological deficiencies. Recent progress in artificial retinas and man-machine interfaces that permit communication or action via thoughts alone gives us a glimpse of the possibilities the future might hold for improving the lives of the handicapped. The new Center will concentrate on six main themes: vision (retinal implants), hearing (cochlear implants), mobility (cortical and spinal implants), non-invasive man-machine interfaces (piloting at distance, robotics), the micro-and nano-fabrication of implants, and neuronal coding (signal processing, sensors).

The Center will be inaugurated on January 1, 2009, and will formally be part of EPFL's School of Engineering, in collaboration with the School of Life Sciences and the School of Computer and Communication Sciences. This project also opens the door to fruitful collaborations with other institutions in the Lake Geneva area, such as University of Lausanne and the Cantonal Hospital (CHUV)), University of Geneva and its hospital (HUG), and the regional biomedical industry."

Other posts on how prolific neuroresearch appears to be in Switzerland:
1. Virtual Body Experience
2. Something in Swiss water?
3. More from Lausanne: Mapping the structural core of the human cerebral cortex
4. Smelling someone else's alarm bells


On a related topic, related in terms of collaborative projects done by teams of people, in this case by a private backer, reader Kent sent me a link to Piece of Mind, from the Economist.

Excerpt:
"When we first put the mouse-brain atlas online free, it was met by the research world with suspicion. People wondered what the catch was. Scientific research has long been a solitary endeavour—one researcher, one microscope. Findings are protected so that discovery credit can be clearly defined and awarded. This is a successful model and will continue to be.

However, the Human Genome Project demonstrated a different path: multiple teams working collaboratively towards a common goal (...) We wanted the mouse atlas to be free and available for all to use as the basis for foundational research and discovery.

A new generation of implantable pacemakers for the brain will be widely used to treat everything from depression to addiction and Parkinson’s disease

If we thought it would be a hit right out of the gate, we were slightly wrong. It took a while for people to trust that it really was free to use. No one believed in a free lunch.

Now, things have changed. Today we have many scientists using the atlas for their research into Alzheimer’s, bipolar disorders, Down’s syndrome, Parkinson’s, fragile x mental retardation and epilepsy. The atlas is also giving scientists insight into alcoholism, obesity, sleep, hearing and memory.

The greatest testament to what we did was that researchers of spinal-cord diseases, trauma and disorders approached the institute and asked us to create a spinal-cord atlas, which is now close to completion. We will launch the first phase of a human-brain atlas, a four-year project, in 2010.

Like the Human Genome Project, the Allen Brain Atlases and Spinal-Cord Atlas have helped democratise the scientific landscape. When you can log on to a map of gene expression from anywhere in the world, more people can enter the scientific conversation. The result is a massive saving in time, since without the atlas each researcher could spend a lifetime trying to gather complete gene-expression data for his or her work."

Nothing but good will come out of this, I'm sure. Seth Grant, who recently decoded human synapse proteomics, used free genomic data bases to arrive at new perspectives on how evolution of the nervous system has proceeded. (Here is a blog post about that.) Listen to Ginger Campbell's BrainSciencePodcast #51 interview with Dr. Grant. (It was my pleasure to transcribe the interview - the transcription is linked to the podcast shownotes.)



Wednesday, December 17, 2008

More about Locus Ceruleus

Deric Bownds at Mindblog posted about this new article today: Modafinil Shifts Human Locus Coeruleus to Low-Tonic, High-Phasic Activity During Functional MRI. Not exactly a catchy title, but what the abstract implies is pretty exciting - LC seems to be involved in cognition.

Cognition? Cognition. Fascinating.

Here is the abstract, viewable by clicking on Deric's post, How a cognition enhancing drug works.
"Models of cognitive control posit a key modulatory role for the pontine locus coeruleus–norepinephrine (LC-NE) system. In nonhuman primates, phasic LC-NE activity confers adaptive adjustments in cortical gain in task-relevant brain networks, and in performance, on a trial-by-trial basis. This model has remained untested in humans. We used the pharmacological agent modafinil to promote low-tonic/high-phasic LC-NE activity in healthy humans performing a cognitive control task during event-related functional magnetic resonance imaging (fMRI). Modafanil administration was associated with decreased task-independent, tonic LC activity, increased task-related LC and prefrontal cortex (PFC) activity, and enhanced LC-PFC functional connectivity. These results confirm in humans the role of the LC-NE system in PFC function and cognitive control and suggest a mechanism for therapeutic action of procognitive noradrenergic agents."

Thank you so much for bringing this to this reader's avid attention, Deric. I was interested in the pain-downregulating capacity of LC, its role in sleep, and its extensive connection to everything else in the brain. Now it looks like there may be a direct link between it and actual, functional cognition, not just anatomical noradrenergic pathways between it and parts of the brain one might be forgiven for having assumed were involved in actual, functional cognition.

Here is a link to posts I made earlier in the year, about locus ceruleus.

It has become one of those brain part names that leaps out at me, as does the insula.


Tuesday, December 2, 2008

More about virtual bodies

In reference to More about glia, and a Neurophilosophy post on Moseley:

Today's post is short, because Mo has already written it. :-D He's called it The body-swap illusion.

In it Mo explains new work by Henrik Ehrsson, now in Stockholm, the paper If I Were You: Perceptual Illusion of Body Swapping, by Valeria Petkova and Henrik Ehrsson.

Thanks Mo, thumbs up for a great post.

I don't know what more evidence could be found to support the idea that the perceptual brain is in charge of autonomic outflow than to persuade it by means of illusion, both visual and tactile, that it was responsible for maintaining the bodily integrity of a mannequin, then physically threaten the mannequin and measure autonomic alarm as represented by evoked skin conductance response (SCR).

UPDATE Dec 16: Rubber hands feel real for amputees. Thank you again, Mo from Neurophilosophy.