<!DOCTYPE html><HTML lang="en"> <head><meta charset="utf-8"> <title>Todman (Theo) - Thesis - Dicephalus (Theo Todman's Book Collection - Paper Abstracts) </title> <link href="../../TheosStyle.css" rel="stylesheet" type="text/css"><link rel="shortcut icon" href="../../TT_ICO.png" /></head> <BODY> <CENTER> <div id="header"><HR><h1>Theo Todman's Web Page - Paper Abstracts</h1><HR></div><A name="Top"></A> <TABLE class = "Bridge" WIDTH=950> <tr><th><A HREF = "../../PaperSummaries/PaperSummary_17/PaperSummary_17806.htm">Thesis - Dicephalus</A></th></tr> <tr><th><A HREF = "../../Authors/T/Author_Todman (Theo).htm">Todman (Theo)</a></th></tr> <tr><th>Source: </th></tr> <tr><th>Paper - Abstract</th></tr> </TABLE> </CENTER> <P><CENTER><TABLE class = "Bridge" WIDTH=400><tr><td><A HREF = "../../PaperSummaries/PaperSummary_17/PaperSummary_17806.htm">Paper Summary</A></td><td><A HREF = "../../Notes/Notes_0/Notes_68.htm">Link to Latest Write-Up Note</A></td></tr></TABLE></CENTER></P> <hr><P><FONT COLOR = "0000FF"><ul type="disc"><li>This pseudo-Paper is intended as the mechanism to record time spent on the Note '<a name="1"></a><A HREF="../../Notes/Notes_0/Notes_68.htm">Dicephalus</A><SUP>1</SUP>' during my Thesis research, as from 2011. </li><li>For the actual time recorded, click on "Paper Summary" above. </li></ul><FONT COLOR = "0000FF"><hr><br><B><u><U><A HREF="#On-Page_Link_P17806_2">Write-up</A></U><SUB>2</SUB><a name="On-Page_Return_P17806_2"></A></u> (as at 17/08/2018 17:35:31): Dicephalus</B><BR><br><u><U><A HREF="#On-Page_Link_P17806_3">Plug Note</A></U><SUB>3</SUB><a name="On-Page_Return_P17806_3"></A></u><ul type="disc"><li>There are several related pathological conditions in which the number of animals and the number of individuals may fail to align. In sequence of severity of the  condition :- <ol type="1"><li><b>Conjoined Twins</b>: <a name="W198W"></a><A HREF = "https://en.wikipedia.org/wiki/Conjoined_twins" TARGET = "_top">Wikipedia: Conjoined Twins</A>. Varies from a fairly loose conjunction of individuals, who may be separated, to more severe forms with shared organs and limbs. This article is of interest not least because it discusses the issue of fission versus fusion, with the latter now the favourite suggestion. </li><li><b>Polycephaly</b>: <a name="W200W"></a><A HREF = "https://en.wikipedia.org/wiki/Polycephaly" TARGET = "_top">Wikipedia: Polycephaly</A>. Animals or humans with apparently more than one head. Dicephaly is the limiting case. Usually an extreme version of conjunction. </li><li><b>Diprosopus</b>: <a name="W199W"></a><A HREF = "https://en.wikipedia.org/wiki/Diprosopus" TARGET = "_top">Wikipedia: Diprosopus</A>. Animals (including humans  see <a name="W201W"></a><A HREF = "http://www.nydailynews.com/life-style/health/conjoined-twins-hope-faith-fight-survival-article-1.1789137" TARGET = "_top">Link</A> & <a name="W202W"></a><A HREF = "https://uk.news.yahoo.com/one-body-two-faces-rare-twins-born-sydney-083226701.html#4U6U96d" TARGET = "_top">Link</A>; see <a name="W6584W"></a><A HREF = "http://www.dailymail.co.uk/news/article-2862950/Record-setting-cat-2-faces-dies-15.html" TARGET = "_top">Link</A> for Janus cats) with two faces. There may be one or two brains, but only one skull. The important thing  and what differentiates the diprosopus from the dicephalus  is that there is much less duplication of body parts, so it is very much two brains sharing one body  though it can also be the relatively superficial  though tragic  case of one brain, one body and two faces. </li></ol></li><li>All these situations  and in particular the paradigm case of dicephalus, wherein it appears that we have a (human) animal with two heads  are often cited as a <em>prima facie</em> <a name="2"></a><A HREF="../../Notes/Notes_1/Notes_112.htm">problems for Animalism</A><SUP>4</SUP>. </li><li>The claim is that while we have multiple <a name="3"></a><A HREF="../../Notes/Notes_0/Notes_9.htm">persons</A><SUP>5</SUP>, we only have a single <a name="4"></a><A HREF="../../Notes/Notes_0/Notes_30.htm">animal</A><SUP>6</SUP>, so the animalist claim that persons are numerically identical to their <a name="5"></a><A HREF="../../Notes/Notes_1/Notes_113.htm">organisms</A><SUP>7</SUP> is false. </li><li>Of course, the above claim is somewhat bald. <a name="6"></a><A HREF="../../Notes/Notes_0/Notes_24.htm">Animalism</A><SUP>8</SUP> - at least in the form expounded by <a name="28"></a><A HREF = "../../Authors/O/Author_Olson (Eric).htm">Eric Olson</A> - has no truck with psychology as necessary for our persistence. While Olson often refers to  people this is just shorthand for  some of <a name="7"></a><A HREF="../../Notes/Notes_7/Notes_734.htm">us</A><SUP>9</SUP> , rather than  persons , the plural of person. </li><li>So, if the animalist claim is that we are human animals, then the question is  in the case of dicephalus and related conditions  how many of us are present, and how many human animals are present. Animalism need the numbers to be equal. </li><li>The cases under consideration have the advantage over standard <a name="8"></a><A HREF="../../Notes/Notes_0/Notes_32.htm">Thought Experiments</A><SUP>10</SUP>, in that they are real-life cases. What is actual must be possible, and a standard argument against TEs is thereby avoided  namely that some of them, at least, whatever our intuitions may say, may not in fact be possible because the TEs are under-described. </li><li>That said, there s still a temptation to push the boundaries, and to consider cases in this general area that are not actual, yet are not quite as science-fiction as the usual TEs. </li><li>Cases of dicephalus are fairly rare, and often one  twin is degenerate so it s not clear that we have two persons or two of  us . However, the case of the dicephalus twins, <b>Abigail and Brittany Hensel</b>, where one body appears to be coordinated by two brains (see <a name="W196W"></a><A HREF = "https://mymultiplesclerosis.co.uk/ec/abigail-and-brittany-hensel-the-twins-who-share-a-body/" TARGET = "_top">Abigail and Brittany Hensel</A>, and probably more  official sites  see <a name="W197W"></a><A HREF = "https://en.wikipedia.org/wiki/Abigail_and_Brittany_Hensel" TARGET = "_top">Wikipedia: Abigail and Brittany Hensel</A> for instance) shows that this is not necessarily the case. Here we definitely have two persons, but maybe only one animal. This is probably a real-life case of either incomplete <a name="9"></a><A HREF="../../Notes/Notes_0/Notes_33.htm">fission</A><SUP>11</SUP> or of <a name="10"></a><A HREF="../../Notes/Notes_0/Notes_34.htm">fusion</A><SUP>12</SUP>.</li><li>There are two issues with these cases:- <ol type="1"><li>How should they be best described? </li><li>How should the animalist respond? </li></ol></li><li><b>Description</b>: <ol type="1"><li>I need to research this further, but it seems to me that we have a sliding scale of pathological cases  from that of Siamese twins (who are often fairly loosely connected, and can often be surgically separated) to the much more extreme cases of diprosopus. </li><li>I presume, also, that we can have both fission and fusion. </li><li>In the case of (incomplete) fission, the twins will be identical, as the situation is one where the twinning process has not completed. </li><li>But (I imagine) we can also have a case of fusion, where the twin-embryos  whether identical or fraternal  that were separate have subsequently partially fused. </li></ol></li><li><b>Response</b>: <ol type="1"><li>The most likely response from the animalist is that the dicephalus is not a single organism, but two organisms that share some body-parts. </li><li>The force of the arguments in this kind of case depends on  relevant similarity  if the dicephalus-case is sufficiently similar to the general case, it can be used to show things about the general case. But this claim can be rejected. </li><li>In the case of diprosopus, it is more difficult to claim that there are two organisms. Now  in practice  there are never two persons either (as all the 30-odd cases recorded since 1860, the condition has proved quickly fatal, so there are no persons present). But this might not always be so. So, <a name="29"></a><A HREF = "../../Authors/B/Author_Baker (Lynne Rudder).htm">Lynne Rudder Baker</A> might claim that the rudimentary persons are indeed persons  as there is a possibility that they would develop into robust persons. Failing that, it might be the case in the future that there is a case where the diprosopus survives to develop personality. </li></ol></li><li>For a page of <U><A HREF="#On-Page_Link_P17806_13">Links</A></U><SUB>13</SUB><a name="On-Page_Return_P17806_13"></A> to this Note, <A HREF = "../../Notes/Notes_0/Notes_68_Links.htm">Click here</A>.</li><li>Works on this topic that <U><A HREF="#On-Page_Link_P17806_14">I ve actually read</A></U><SUB>14</SUB><a name="On-Page_Return_P17806_14"></A>, <U><A HREF="#On-Page_Link_P17806_15">include</A></U><SUB>15</SUB><a name="On-Page_Return_P17806_15"></A> the following:- <ol type="i"><li><a name="12"></a>"<A HREF = "../../Abstracts/Abstract_07/Abstract_7623.htm">Blatti (Stephan) - Animalism, Dicephalus, and Borderline Cases</A>", Blatti</li><li><a name="13"></a>"<A HREF = "../../Abstracts/Abstract_19/Abstract_19912.htm">Blatti (Stephan), Ed. - The Lives of Human Animals</A>", Blatti</li><li><a name="14"></a>"<A HREF = "../../Abstracts/Abstract_07/Abstract_7624.htm">Blatti (Stephan) - Animalism and its Implications</A>", Blatti</li><li><a name="15"></a>"<A HREF = "../../Abstracts/Abstract_04/Abstract_4546.htm">Hershenov (David) - Countering the Appeal of the Psychological Approach to Personal Identity</A>", Hershenov</li><li><a name="16"></a>"<A HREF = "../../Abstracts/Abstract_20/Abstract_20173.htm">Liao (S. Matthew) - The Organism View Defended</A>", Liao</li><li><a name="17"></a>"<A HREF = "../../Abstracts/Abstract_15/Abstract_15141.htm">Shoemaker (David) - Personal Identity and Immortality</A>", Shoemaker</li><li><a name="18"></a>"<A HREF = "../../Abstracts/Abstract_15/Abstract_15140.htm">Shoemaker (David) - Personal Identity, Rational Anticipation, and Self-Concern</A>", Shoemaker</li><li><a name="19"></a>"<A HREF = "../../Abstracts/Abstract_05/Abstract_5138.htm">Wilson (Jack) - Beyond Horses and Oak Trees: A New Theory of Individuation for Living Entities</A>", Wilson</li></ol></li><li>A reading list (where not covered elsewhere) might start with:- <ol type="i"><li><a name="20"></a>"<A HREF = "../../Abstracts/Abstract_06/Abstract_6652.htm">Barilan (Y. Michael) - One or Two: An Examination of the Recent Case of the Conjoined Twins from Malta</A>", Barilan</li><li><a name="21"></a>"<A HREF = "../../Abstracts/Abstract_21/Abstract_21016.htm">Campbell (Tim) & McMahan (Jeff) - Animalism and the Varieties of Conjoined Twinning</A>", Campbell & McMahan</li><li><a name="22"></a>"<A HREF = "../../Abstracts/Abstract_21/Abstract_21098.htm">Hershenov (David) - Problems with a Constitution Account of Persons</A>", Hershenov</li><li><a name="23"></a>"<A HREF = "../../Abstracts/Abstract_21/Abstract_21104.htm">Hershenov (David) - Shoemaker's Problem of Too Many Thinkers</A>", Hershenov</li><li><a name="24"></a>"<A HREF = "../../Abstracts/Abstract_20/Abstract_20170.htm">Koch-Hershenov (Rose J.) - Conjoined Twins and the Biological Account of Personal Identity</A>", Koch-Hershenov</li><li><a name="25"></a>"<A HREF = "../../Abstracts/Abstract_20/Abstract_20707.htm">Olson (Eric) - The Metaphysical Implications of Conjoined Twining</A>", Olson</li><li><a name="26"></a>"<A HREF = "../../Abstracts/Abstract_22/Abstract_22077.htm">Reid (Mark D.) - A Case in Which Two Persons Exist in One Animal</A>", Reid</li><li><a name="27"></a>"<A HREF = "../../Abstracts/Abstract_21/Abstract_21009.htm">Snowdon (Paul) - Animalism and the Unity of Consciousness</A>", Snowdon</li></ol></li><li>This is mostly a <a name="11"></a><A HREF="../../Notes/Notes_7/Notes_737.htm">place-holder</A><SUP>16</SUP>. </li></ul><BR><HR><BR><U><B>In-Page Footnotes</U></B><a name="On-Page_Link_P17806_2"></A><BR><BR><U><A HREF="#On-Page_Return_P17806_2"><B>Footnote 2</A></B></U>: <ul type="disc"><li>This is the write-up as it was when this Abstract was last output, with text as at the timestamp indicated (17/08/2018 17:35:31). </li><li><A HREF = "../../Notes/Notes_0/Notes_68.htm">Link to Latest Write-Up Note</A>. </li></ul><a name="On-Page_Link_P17806_3"></A><U><A HREF="#On-Page_Return_P17806_3"><B>Footnote 3</A></B></U>: <ul type="disc"><li>A number of my philosophical Notes are  promissory notes currently only listing the books and papers (if any) I possess on the topic concerned. </li><li>I ve decided to add some text  whether by way of motivation, or something more substantive  for all these identified topics related to my Thesis.</li><li>As I want to do this fairly quickly, the text may be confused or show surprising ignorance. </li><li>The reader (if such exists) will have to bear with me, and display the principle of charity while this footnote exists. </li></ul><a name="On-Page_Link_P17806_13"></A><U><A HREF="#On-Page_Return_P17806_13"><B>Footnote 13</A></B></U>: <ul type="disc"><li>If only a  non-updating run has been made, the links are only one-way  ie. from the page of links to the objects that reference this Note by mentioning the appropriate key-word(s). The links are also only indicative, as they haven t yet been confirmed as relevant. </li><li>Once an updating run has been made, links are both ways, and links from this Notes page (from the  Authors, Books & Papers Citing this Note and  Summary of Note Links to this Page sections) are to the  point of link within the page rather than to the page generically. Links from the  links page remain generic. </li><li>There are two sorts of updating runs  for Notes and other Objects. The reason for this is that Notes are archived, and too many archived versions would be created if this process were repeatedly run. </li></ul> <a name="On-Page_Link_P17806_14"></A><U><A HREF="#On-Page_Return_P17806_14"><B>Footnote 14</A></B></U>: <ul type="disc"><li>Frequently I ll have made copious marginal annotations, and sometimes have written up a review-note. </li><li>In the former case, I intend to transfer the annotations into electronic form as soon as I can find the time. </li><li>In the latter case, I will have remarked on the fact against the citation, and will integrate the comments into this Note in due course. </li><li>My intention is to incorporate into these Notes comments on material I ve already read rather than engage with unread material at this stage. </li></ul><a name="On-Page_Link_P17806_15"></A><U><A HREF="#On-Page_Return_P17806_15"><B>Footnote 15</A></B></U>: <ul type="disc"><li>I may have read others in between updates of this Note  in which case they will be marked as such in the  References and Reading List below.</li><li>Papers or Books partially read have a rough %age based on the time spent versus the time expected. </li></ul> <FONT COLOR = "0000FF"><HR></P><a name="ColourConventions"></a><p><b>Text Colour Conventions (see <A HREF="../../Notes/Notes_10/Notes_1025.htm">disclaimer</a>)</b></p><OL TYPE="1"><LI><FONT COLOR = "0000FF">Blue</FONT>: Text by me; &copy; Theo Todman, 2018</li></OL> <BR><HR><BR><CENTER> <TABLE class = "Bridge" WIDTH=950> <TR><TD WIDTH="30%">&copy; Theo Todman, June 2007 - August 2018.</TD> <TD WIDTH="40%">Please address any comments on this page to <A HREF="mailto:theo@theotodman.com">theo@theotodman.com</A>.</TD> <TD WIDTH="30%">File output: <time datetime="2018-08-17T21:38" pubdate>17/08/2018 21:38:47</time> <br><A HREF="../../Notes/Notes_10/Notes_1010.htm">Website Maintenance Dashboard</A></TD></TR> <TD WIDTH="30%"><A HREF="#Top">Return to Top of this Page</A></TD> <TD WIDTH="40%"><A HREF="../../Notes/Notes_11/Notes_1140.htm">Return to Theo Todman's Philosophy Page</A></TD> <TD WIDTH="30%"><A HREF="../../index.htm">Return to Theo Todman's Home Page</A></TD> </TR></TABLE></CENTER><HR> </BODY> </HTML>