Families Hear from Completely Paralyzed Patients via New Device
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Paper cited by the present article: http://journals.plos.org/plosbiology/article?id=10.1371/jour...
Original fMRI paper: http://onlinelibrary.wiley.com.sci-hub.cc/doi/10.1002/ana.23...
Niels Birbaumer, a neuroscientist at the Wyss Center for Bio and Neuroengineering in Geneva and coauthor of the new research, has an idea about why this may be, although there’s little evidence to support it so far. He proposed that it becomes harder over time for patients to channel their thoughts into voluntary action. “Anything you want, everything you wish does not occur. So what the brain learns is that intention has no sense anymore,” he says. “It is too difficult for them to switch from [a] more reflective state into an attentive state."
And that the device they used itself was designed to be more a passive monitoring of mental perception of input: The team stuck to simple questions that could be answered with a yes or no. “The answer in your head…occurs quickly and it occurs like a reflex. You don’t have to mobilize a lot of resources for such a simple answer,” Birbaumer says.
Earlier paper from Birbaumer: We propose that a lack of contingencies between goal directed thoughts and intentions may be at the heart of this problem. Experiments with chronically curarized rats support our hypothesis; operant conditioning and voluntary control of autonomic physiological functions turned out to be impossible in this preparation. In addition to assisted communication, BCIs consisting of operant learning of EEG slow cortical potentials and sensorimotor rhythm were demonstrated to be successful in drug resistant focal epilepsy and attention deficit disorder. First studies of non-invasive BCIs using sensorimotor rhythm of the EEG and MEG in restoration of paralysed hand movements in chronic stroke and single cases of high spinal cord lesions show some promise, but need extensive evaluation in well-controlled experiments. Invasive BMIs based on neuronal spike patterns, local field potentials or electrocorticogram may constitute the strategy of choice in severe cases of stroke and spinal cord paralysis. Future directions of BCI research should include the regulation of brain metabolism and blood flow and electrical and magnetic stimulation of the human brain (invasive and non-invasive). A series of studies using BOLD response regulation with functional magnetic resonance imaging (fMRI) and near infrared spectroscopy demonstrated a tight correlation between voluntary changes in brain metabolism and behaviour.
[1] http://www.popsci.com/new-brain-computer-interface-helps-com...
[2] http://journals.plos.org/plosbiology/article?id=10.1371/jour...
For me, an analogy to speech helps: a baby learning to speak must learn not just language in a high-level sense, but at a lower level, they must "learn" (i.e. calibrate neurotransmitter receptors attached to motor pathways) for how strongly each muscle in their vocal cords should respond to a given low-level phonemic motor-intent-signal from the brain.
If you didn't talk for years, those calibrations would drift, and although you'd remember what it was like to talk, you'd have to "learn to use" (i.e. calibrate) your vocal cords all over again.
The interesting thing here, is that this "calibration" (or lack thereof) continues to cascade through the entire graph of neurons: think backpropagation in machine learning. Motor-neurons that have nothing to talk to lose their ability to talk; and then the motor-intent-recognizing neurons find the only thing they had to talk to (the motor neurons) are now silent—as good as dead—and so they no longer get reward-trained and lose their receptivity-calibration—and on and on, back until you reach whatever subset of neurons is still doing things that achieve "rewards."
2. Did the fMRI people (see top comment) respond similarly as happy?
The main problems I thought they should have is isolation - but maybe one sided family/nurse visits is enough to deter that ?
And also no control - but this doesn't necessarily leads to depression if you learn to accept it, and if the environment is good.
IIRC, they used five different shapes and repeated each choice at least three times for error correction, and two or three choices selected one keyboard key. The poor grad student demonstrating the procedure made quite a few typos, after which he had to select backspace, and the process was excruciatingly slow anyway, so it took a few minutes until he managed to write "Hello, welcome to ...". But definitely better than nothing if you are locked in.
The original paper is not bad as the article though, they call for replication for instance -
"In view of the gravity of the subject matter (i.e., establishing communication with nonverbal, completely paralyzed persons with preserved cognition), a call for replication of the current results by other investigators would be welcome. "
HN is Reddit+
I wonder if there is a good opportunity for HN+ (Or is there already?)
It really isn't, though. It's not a scam to publish with a p>.05 standard and get false positives. It just means you need to take studies with a grain of salt.
Note that this is a replication of a similar technique used in fMRI, but this time in a different modality (=> different signal space). [See Owen, 2012]. Unless you think the academic field of machine-learning is a "scam", then this is starting to look somewhat credible. It's getting interesting, let's say.
Let's not forget that this means that (in the current version of the system) about every third answer output by the system is wrong.
That sounds like incredible hogwash. Why not admit you are doing the equivalent of connecting an oscilloscope to some random signal on a extremely complex high-speed board, and well, it's not that easy.
Another similar field that can be even helpful to normal humans, is connecting the biological neural network to artificial one via nanobots. Immense benifits for increasing average human intelligence, education ...