Friday, May 05, 2006

On Death and Dread and Doom

Or just dread. You might have heard about the study reported to show that the anticipation of pain can be as bad as the pain itself. It's by Berns et al., and was published in this week's Science. Here is the abstract:
Neurobiological Substrates of Dread

Given the choice of waiting for an adverse outcome or getting it over with quickly, many people choose the latter. Theoretical models of decision-making have assumed that this occurs because there is a cost to waiting—i.e., dread. Using functional magnetic resonance imaging, we measured the neural responses to waiting for a cutaneous electric shock. Some individuals dreaded the outcome so much that, when given a choice, they preferred to receive more voltage rather than wait. Even when no decision was required, these extreme dreaders were distinguishable from those who dreaded mildly by the rate of increase of neural activity in the posterior elements of the cortical pain matrix. This suggests that dread derives, in part, from the attention devoted to the expected physical response and not simply from fear or anxiety. Although these differences were observed during a passive waiting procedure, they correlated with individual behavior in a subsequent choice paradigm, providing evidence for a neurobiological link between the experienced disutility of dread and subsequent decisions about unpleasant outcomes.
There's good discussion of the article at BRAINETHICS, here, and uh... metadiscussion at The Neurocritic, here and here.

And while we're on the subject of pain, you might enjoy this post at Eide Neurolearning Blog (via Omni Brain), on the role of "sensory-motor incongruence" in certain types of pain. Here's an excerpt:
"In 66% of health volunteers, abnormal sensations of pain (“numbness, pins and needles, moderate aching and/or a definite pain”) or other sensations (“perceived changes in temperature, limb weight, altered body image, disorientation”) were reported following artificially-induced sensory-motor incongruence."
Reading about their methodology, I can't help but be reminded of the famous rubber hand experiment ("Rubber hands 'feel' touch that the eye sees"), though that had nothing to do with pain.

And while we're on the subject of Omni Brain, check out this post on research demonstrating (un)importance of neurogenesis. From the post:
Hen's team zapped mice with a focused dose of radiation to halt neurogenesis in a portion of the animals' hippocampuses. They then placed half the animals in regular cages and half in enhanced environments for 6 weeks before testing their anxiety and spatial memory. To the researchers' surprise, the animals with better accommodations had improved spatial memory skills and were less anxious than mice in smaller confines, despite not having any new neurons in their hippocampuses. "We thought we would see a dependence on neurogenesis in some of the behaviors we saw in the enriched environment, but that's not what we found," says Hen.
By the way, isn't it hoppocampi?

And while we're on the subject of a bunch of blogs by neuroscientists, where are the cognitive psychologists? Are Cognitive Daily and Mixing Memory alone in the blogosophere?

8 comments:

Bora Zivkovic said...

Would you categorise CogBlog and MindHacks as "close enough" to cognitive psych blogs? Perhaps not 100% but they often cover such stuff. Others on your blogroll? Some from the reading group?

Sandra said...

Here's one: http://drdeborahserani.blogspot.com/ and there are likely more on her blogroll but she's not doing the same kind of writing you and CD are. Less research, more consumer-oriented.

Your blog is unique. I've read many blogs on closely-related subjects, but none with your sensibilities and focus and definitely not with your talent. Cheers for that!

Chris said...

coturnix, I probably should have included Mind Hacks. Their own work is much more on the applied side, but cognitive psychology is their focus.

Sandra, thanks, I hadn't been to that blog. It looks interesting. And thank you for the compliments.

Steve Higgins said...

I'm a "cognitive" psychologist, but you know.. these days there its really more about the technique than the questions we're asking. Seems like everyone is asking the same things.

Chris said...

Steve, right, that's probably what I meant. And in reality, I realize that cognitive neuroscience is, on the whole, sexier than yet another study testing exemplar, prototype, decision bound models, and god knows what other models of classification. I think my work is incredibly interesting, but I'm not sure how to make it interesting in the same way that a study about "dread" is interesting. I certainly couldn't get a whole blog out of it.

Anonymous said...

Musicalperceptions.blogspot.com often moves into the realm of cognitive psychology -- with an emphasis on music, of course.

Chris said...

Cool. Thanks, Dave.

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