Yes, but it shows that claims that there is a spiritual non-physical dimension that overlies and controls the physical brain in humans is an illusion. Both our intention and our experience of what we call free will arise entirely from neurobiological processes in the brain.
Alec
evolutionpages.com
Regarding: Desmurget et al, Movement Intention after Parietal Cortex Stimulation in Humans,
Science 324 811 – 813 (2009)
This paper refers to awake brain surgery using a neuronavigation system. The surgery took place in France. To get a better idea of what was actually happening in the operating room, I suggested the website
www.mayoclinic.org/awake-brain-surgery/brain-mapping,html Comparing the material which you sent me with the descriptions of brain mapping from Mayo Clinic, Rochester, Minnesota, I find that basically the same principles are being used. If you see otherwise, please advise. Also you can check neuro-oncology on the website.
In post 337, you kindly provided excerpts from the paper plus your comments.
Following are your comments on the procedure and the paper’s conclusion:
The problem then becomes identifying the specific neural circuit which gives rise to the experience of free-will and intention, which he addresses in this paper. To cut a long story short, stimulation of specific regions of the pre-motor regions causes movement without the experience of an intention to move (or indeed an awareness of movement), while stimulation of specific regions of the inferior parietal regions created an intention to move and with a higher intensity of stimulation, a belief that movement had occurred, even if it hadn’t. Their conclusion:
“Our study suggests that motor intention and awareness are emerging consequences of increased parietal activity before movement execution. The subjective (and potentially illusory) feeling that we are executing a movement does not arise from movement itself, but it is generated by prior conscious intention and its predicted consequences.”
From what I have read, awake brain surgery is totally in the realm of the physical body beginning with its purpose which is to remove tumors which would normally be considered inoperable or extremely risky. Neurosurgeons use awake brain surgery on tumors that infiltrate brain regions which control functions like speech and movement; therefore, the risk of postoperative sequelae can be minimized.
Since the patient is “awake” under local anesthesia, specific questions are asked following stimulation with a bipolar electrode. Depending on the answers, the neurosurgeon maps the brain by marking each area identified as functional brain so as to avoid damaging these areas.
I totally agree that awake brain surgery provides an opportunity to study human behavior. The last three sentences of the abstract are key, i.e., what is being studied resides in the physical body and is not related to free will which is different.
From abstract: Stimulation of the premotor region triggered overt mouth and contralateral limb movements. Yet, patients firmly denied that they had moved. Conscious intention and motor awareness thus arise from increased parietal activity before movement execution."
Alec, the first thing the two of us need to do is to pin down the actual claim of this paper and then determine what subsequent claims can follow. In order to do this efficiently, I would like to know your definition of free will, both scientific and what may appear as a philosophical definition of free will. It really doesn’t make any difference if one believes in free will or not, we simply need to be on the same page in our discussion.
Please explain what is being referred to as “a spiritual non-physical dimension that overlies and controls the physical brain in humans” from post 464. I’m guessing that this is really a way-out illusion or perhaps a common misunderstanding.
Also, a clarification is needed regarding free will and intention as in your sentence: “Both our intention and our experience of what we call free will arise entirely from neurobiological processes in the brain.” From my reading of the paper, intention was used physically as in motor intention. The paper’s conclusion does refer to “The subjective (and potentially illusory) feeling that we are executing a movement does not arise from the movement itself…” However, even though feelings can influence choice, feelings are not free will.
Finally, going back to your post 337 – to your first quote from the paper, I would like your expansion on some of the “phrasing” because I am having a hard time relating this section to free will. This, of course, is why I see this paper referring to the physical body rather than to something which is intangible. It sounds like the researcher is saying that these intentions are the origin of willed actions. However, that would be a gross misinterpretation of basic free will. Even conscious intention needs to be compared with motor intention caused by electrical stimulation.
Furthermore, the question as to whether the decision to move preceded or lagged brain activity cannot be adequately addressed in relationship to free will until the decision, itself, is determined to be the result of a valid execution of properly defined free will.
Blessings,
granny
All human life is sacred.