<p><strong>Short answer</strong><br>
Human brain transplants have never been performed, so any answers to what will happen are mere speculations.</p>

<p><strong>Background</strong><br>
Whole-head transplants have been performed on animals, the first reports go back to the 1970's <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/" rel="nofollow noreferrer">(Canavero, 2013)</a>. The practice is still pursued today (<em>e.g.</em>., <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/cns.12422" rel="nofollow noreferrer">Ren <em>et al</em>., 2015)</a>). Up until now, however, it has not been done in humans, and likely it never will be (source: <a href="https://www.theguardian.com/science/brain-flapping/2017/nov/17/no-there-hasnt-been-a-human-head-transplant-and-may-never-be-sergio-canavero" rel="nofollow noreferrer">The Guardian</a>). This, because of medical limitations <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/" rel="nofollow noreferrer">(Canavero, 2013)</a> as well as ethical considerations <a href="https://www.tandfonline.com/doi/abs/10.1080/21507740.2017.1392386" rel="nofollow noreferrer">(Wolpe, 217)</a></p>

<p>The biggest problem medically is the re-connection of the thousands of spinal neurons linking the brain to the rest of the body <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/" rel="nofollow noreferrer">(Canavero, 2013)</a>. Further, immune responses and immediate cell death due to oxygen depletion may all further hamper the process. Nonetheless, certain groups envision it will be at one time possible in humans <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/" rel="nofollow noreferrer">(Canavero, 2013)</a>.</p>

<p>The same limitations as with head transplants discussed above apply for a brain transplant. The thing is that with a whole-head transplant the major arteries can be quickly connected to feed the brain. With a brain transplant this also becomes a major bottle neck, making it even more difficult. Transplanting a head can be done with relative ease by sacrificing the donor and straight away stitch it to the beheaded recipient. A brain transplant needs even more steps. The big advantage of a head transplant is also that  the brain, being within its own cephalon, still connects to the cranial nerves (<a href="http://www.resuscitationjournal.com/article/0300-9572%2875%2990043-X/abstract" rel="nofollow noreferrer">White et al, 1975</a>).  </p>

<p><sub><strong>References</strong><br>
<strong>-</strong> <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/" rel="nofollow noreferrer">Canavero, <em>Surg Neurol Int</em> (2013); <strong>4</strong>(S1): S335–S42</a><br>
<strong>-</strong> <a href="https://onlinelibrary.wiley.com/doi/full/10.1111/cns.12422" rel="nofollow noreferrer">Ren <em>et al</em>., <em>CNS Neurosci Therapeutics</em> (2015); <strong>21</strong>(8): 615-8</a><br>
<strong>-</strong> <a href="http://www.resuscitationjournal.com/article/0300-9572%2875%2990043-X/abstract" rel="nofollow noreferrer">White et al. <em>Resuscitation</em> 1975;<strong>4</strong>,197-210</a><br>
<strong>-</strong> <a href="https://www.tandfonline.com/doi/abs/10.1080/21507740.2017.1392386" rel="nofollow noreferrer">Wolpe, <em>AJOB Neurosci</em> (2017); <strong>8</strong>(4)</a></sub></p>

<p><sub><strong>Further reading</strong><br>
<strong>-</strong> <a href="https://biology.stackexchange.com/a/28572/9943">Is brain transplantation possible?</a></sub></p>

CC BY-SA 4.0
2018-05-03T12:17:52.347Z
Thank you! for such wonderful explaination.But what about thoughts or thinking ability or way of thinking
susheel 1911
CC BY-SA 4.0
2018-05-03T12:39:26.620Z
@susheel1911 no worries, glad to share information. As said above, it's mere speculation. Speculative (discussion) - type questions (and answers) are offtopic, so I have tried to give a solid science based answer without drifting into philosophical matters. Other users may, however, feel otherwise and may provide you with other material
AliceD
CC BY-SA 4.0
2018-05-03T19:53:13.063Z
Eh, though it hasn't been done, I think neuroscience has a pretty clear answer that the brain is where thinking happens, so therefore your thoughts would be transplanted along with a brain. Of course the new environment can influence thinking as well, which is probably why this answer is hedging so much.
Bryan Krause
CC BY-SA 4.0
2018-05-03T19:59:15.397Z
@BryanKrause - it's hypothetical. Cell death, allograft rejection *etc* will instantly ruin the transplanted brain even before it's grafted. My answer is a practical approach. It's obviously not what OP wishes to hear :) I realize that. You're more than welcome to generate a philosophical debate, but I'd rather not :)
AliceD
CC BY-SA 4.0
2018-05-03T20:00:27.137Z
@AliceD "If I'm transplanted with, e.g., Stephen Hawking's brain, would I start to think like him, or would I remain to think like me" - He might not think like Hawking, but he definitely wouldn't think like himself. "is it the physical structure of brain or any non physical thing" - According to modern neuroscience, it's entirely the physical structure of the brain, no "soul" is necessary.
Bryan Krause
CC BY-SA 4.0
2018-05-03T21:06:10.260Z
@BryanKrause - sure thing. I know, you know, but in the end, Stephen Hawking's brain is no more. The question is purely hypothetical and I am not going to be lured into a philosophical debate. Brain transplants can't be done. Period.
AliceD
CC BY-SA 4.0
2018-05-03T09:31:44.003Z
2018-05-06T19:49:22.647Z
2018-05-06T19:49:22.647Z
AliceD
<p>Assuming we could do a human brain trransplant and it wouldn't damage too much the recipient body or the donated brain:</p>

<p>The body that is currently called "your body", when it woke up, would wake up with Stephen Hawking's (or whoever's) thoughts and memories, though he may be in different "moods" than he normally is in because now he would also have your endocrine system (your glands), which would affect his brain function. </p>

<p>That's because our best model of how mental activity occurs is it's the brain that stores style of thinking, skills, memories and other types of mental content. This is in contrast, to, say, Aristotle's view that the brain was merely an organ for cooling the blood. Furthermore, <em>specific</em> brains--in terms of structure and function--give rise to <em>specific</em> sets of mental content. </p>

<hr>

<p><strong>What's the evidence for the idea that the brain is the location of mental function and that the structure and functionality of a particular brain dictates the mental content generated by that brain?</strong> A great deal indeed, but here is a smattering of evidence:</p>

<p>Damage to the brain causes obvious changes to mental function. One good examples of this is <a href="https://www.ninds.nih.gov/Disorders/All-Disorders/Agnosia-Information-Page" rel="nofollow noreferrer">stroke</a>, in which specific areas of the brain are destroyed. This can leave a person with a very specific mental deficit, such as the <a href="https://www.ninds.nih.gov/Disorders/All-Disorders/Agnosia-Information-Page" rel="nofollow noreferrer">inability to recognize specific classes</a> of objects, faces, or words. But there are many other ways for the brain to be changed, and along with it, personality or thinking. <a href="http://www.theneuroethicsblog.com/2012/09/return-of-pedophilic-brain-tumor.html" rel="nofollow noreferrer">Tumors</a> may have been responsible for sexually deviant behavior. On the positive side, a traumatic brain injury may have <a href="https://www.livescience.com/45349-brain-injury-turns-man-into-math-genius.html" rel="nofollow noreferrer">turned a man into a math genius</a>.</p>

<p>Temporary changes to brain biochemistry, such as alcohol intoxication, hypoglycemia, hypercapnia (too high carbon dioxide), etc., all cause obvious and usually reliably reversible changes in mental function. </p>

<p>There are essentially unending examples, either in humans or animal models, that show that brains underlie mental function and that specific brains give rise to specific minds (for some non-spiritual definition of "a mind"). </p>

CC BY-SA 4.0
2018-05-08T17:09:25.777Z
2018-05-09T23:39:28.453Z
2018-05-09T23:39:28.453Z
Chelonian
<p>If I'm transplanted with, <em>e.g.</em>, Stephen Hawking's brain, would I start to think like him, or would I remain to think like me? On which, "thinking" ability depends , is it the physical structure of brain or any non physical thing?</p>

<neuroscience><theoretical-neuroscience><psychology><brain>
Are thoughts transferred along with a brain during a brain transplantation?
susheel 1911
# Are thoughts transferred along with a brain during a brain transplantation?

(Asked by: username_0 on 2018-05-03)

If I'm transplanted with, *e.g.*, Stephen Hawking's brain, would I start to think like him, or would I remain to think like me? On which, "thinking" ability depends , is it the physical structure of brain or any non physical thing?

**Tags:** neuroscience, theoretical-neuroscience, psychology, brain


---

## 2 answers

### Answer by username_1 on 2018-05-03. Score: 7

**Short answer**  
Human brain transplants have never been performed, so any answers to what will happen are mere speculations.

**Background**  
Whole-head transplants have been performed on animals, the first reports go back to the 1970's [(Canavero, 2013)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/). The practice is still pursued today (*e.g.*., [Ren *et al*., 2015)](https://onlinelibrary.wiley.com/doi/full/10.1111/cns.12422)). Up until now, however, it has not been done in humans, and likely it never will be (source: [The Guardian](https://www.theguardian.com/science/brain-flapping/2017/nov/17/no-there-hasnt-been-a-human-head-transplant-and-may-never-be-sergio-canavero)). This, because of medical limitations [(Canavero, 2013)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/) as well as ethical considerations [(Wolpe, 217)](https://www.tandfonline.com/doi/abs/10.1080/21507740.2017.1392386)

The biggest problem medically is the re-connection of the thousands of spinal neurons linking the brain to the rest of the body [(Canavero, 2013)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/). Further, immune responses and immediate cell death due to oxygen depletion may all further hamper the process. Nonetheless, certain groups envision it will be at one time possible in humans [(Canavero, 2013)](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/).

The same limitations as with head transplants discussed above apply for a brain transplant. The thing is that with a whole-head transplant the major arteries can be quickly connected to feed the brain. With a brain transplant this also becomes a major bottle neck, making it even more difficult. Transplanting a head can be done with relative ease by sacrificing the donor and straight away stitch it to the beheaded recipient. A brain transplant needs even more steps. The big advantage of a head transplant is also that the brain, being within its own cephalon, still connects to the cranial nerves ([White et al, 1975](http://www.resuscitationjournal.com/article/0300-9572%2875%2990043-X/abstract)).

**References**  
**-** [Canavero, *Surg Neurol Int* (2013); **4**(S1): S335–S42](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3821155/)  
**-** [Ren *et al*., *CNS Neurosci Therapeutics* (2015); **21**(8): 615-8](https://onlinelibrary.wiley.com/doi/full/10.1111/cns.12422)  
**-** [White et al. *Resuscitation* 1975;**4**,197-210](http://www.resuscitationjournal.com/article/0300-9572%2875%2990043-X/abstract)  
**-** [Wolpe, *AJOB Neurosci* (2017); **8**(4)](https://www.tandfonline.com/doi/abs/10.1080/21507740.2017.1392386)

**Further reading**  
**-** [Is brain transplantation possible?](https://biology.stackexchange.com/a/28572/9943)

> **Comments:**
> **username_0**: Thank you! for such wonderful explaination.But what about thoughts or thinking ability or way of thinking  
> **username_1**: @susheel1911 no worries, glad to share information. As said above, it's mere speculation. Speculative (discussion) - type questions (and answers) are offtopic, so I have tried to give a solid science based answer without drifting into philosophical matters. Other users may, however, feel otherwise and may provide you with other material  
> **username_2**: Eh, though it hasn't been done, I think neuroscience has a pretty clear answer that the brain is where thinking happens, so therefore your thoughts would be transplanted along with a brain. Of course the new environment can influence thinking as well, which is probably why this answer is hedging so much.  
> **username_1**: @BryanKrause - it's hypothetical. Cell death, allograft rejection *etc* will instantly ruin the transplanted brain even before it's grafted. My answer is a practical approach. It's obviously not what OP wishes to hear :) I realize that. You're more than welcome to generate a philosophical debate, but I'd rather not :)  
> **username_2**: @username_1 "If I'm transplanted with, e.g., Stephen Hawking's brain, would I start to think like him, or would I remain to think like me" - He might not think like Hawking, but he definitely wouldn't think like himself. "is it the physical structure of brain or any non physical thing" - According to modern neuroscience, it's entirely the physical structure of the brain, no "soul" is necessary.  
> **username_1**: @BryanKrause - sure thing. I know, you know, but in the end, Stephen Hawking's brain is no more. The question is purely hypothetical and I am not going to be lured into a philosophical debate. Brain transplants can't be done. Period.  

---

### Answer by username_3 on 2018-05-08. Score: 2

Assuming we could do a human brain trransplant and it wouldn't damage too much the recipient body or the donated brain:

The body that is currently called "your body", when it woke up, would wake up with Stephen Hawking's (or whoever's) thoughts and memories, though he may be in different "moods" than he normally is in because now he would also have your endocrine system (your glands), which would affect his brain function.

That's because our best model of how mental activity occurs is it's the brain that stores style of thinking, skills, memories and other types of mental content. This is in contrast, to, say, Aristotle's view that the brain was merely an organ for cooling the blood. Furthermore, *specific* brains--in terms of structure and function--give rise to *specific* sets of mental content.

---

**What's the evidence for the idea that the brain is the location of mental function and that the structure and functionality of a particular brain dictates the mental content generated by that brain?** A great deal indeed, but here is a smattering of evidence:

Damage to the brain causes obvious changes to mental function. One good examples of this is [stroke](https://www.ninds.nih.gov/Disorders/All-Disorders/Agnosia-Information-Page), in which specific areas of the brain are destroyed. This can leave a person with a very specific mental deficit, such as the [inability to recognize specific classes](https://www.ninds.nih.gov/Disorders/All-Disorders/Agnosia-Information-Page) of objects, faces, or words. But there are many other ways for the brain to be changed, and along with it, personality or thinking. [Tumors](http://www.theneuroethicsblog.com/2012/09/return-of-pedophilic-brain-tumor.html) may have been responsible for sexually deviant behavior. On the positive side, a traumatic brain injury may have [turned a man into a math genius](https://www.livescience.com/45349-brain-injury-turns-man-into-math-genius.html).

Temporary changes to brain biochemistry, such as alcohol intoxication, hypoglycemia, hypercapnia (too high carbon dioxide), etc., all cause obvious and usually reliably reversible changes in mental function.

There are essentially unending examples, either in humans or animal models, that show that brains underlie mental function and that specific brains give rise to specific minds (for some non-spiritual definition of "a mind").


---

