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    Erich Round mentions Spike's (2020) paper and suggests that Spike
    showed that one need not distinguish descriptive categories and
    comparative concepts – and here I would like to bring up the notion
    of "homeostatic property concepts" that Dahl (2016) brought into the
    discussion.<br>
    <br>
    <div class="moz-cite-prefix">Erich Round wrote:<br>
    </div>
    <blockquote type="cite"
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        <ul style="margin-top:0cm" type="disc">
          <li class="MsoNormal" style="color:black;mso-list:l0 level1
            lfo1">You’re right I want to “have it both ways”, to treat
            languages as systems and compare them. This is a familiar
            red line that has separated your views from other
            typologists for a while now. I appreciate that you had an
            argument couched in philosophical terms that seemed to lead
            to your conclusion. Formulating such arguments is hard and
            valuable work, but in my view Spike (2020) demonstrates that
            the argument fails, predominantly because it’s based on
            premises that turn out to be false. This is fine; typology
            benefits from such debates: you raised some interesting
            problems; Spike engaged with them and showed them to be
            apparent, not real.<br>
          </li>
        </ul>
      </div>
    </blockquote>
    <br>
    Spike's discussion is mostly at an abstract philosophical level that
    many linguists will find hard to understand (see some reactions from
    me <a moz-do-not-send="true" href="https://dlc.hypotheses.org/2410">here</a>
    and <a moz-do-not-send="true"
      href="https://dlc.hypotheses.org/1963">here</a>), but he cites the
    concrete example of Östen Dahl's work on tense-aspect categories.
    What was innovative about is was that it was based on a parallel
    questionnaire and other parallel texts, and Dahl found "gram
    clusters" such as "perfect grams", "imperfective grams", "habitual
    grams".<br>
    <br>
    According to Dahl (2016: 435), we can see these as similar to Boyd's
    (1999) homeostatic property clusters (HPC):<br>
    <br>
    <div data-offset-key="5l440-0-0" class="_1mf _1mj"><font size="-1"><span><span
            data-offset-key="5l440-0-0"><span data-text="true">"According</span></span></span></font><span
        data-offset-key="5l440-1-0"><span data-text="true"><font
            size="-1"> to HPC theory, a natural kind is a group of
            entities with stable similarities, where there may however
            be no properties shared by all and only the members of the
            group. The only condition is that the similarities are
            stable enough to make better than chance predictions and
            that there are maintained by “homeostatic causal
            mechanisms”. In the case of biological species, these
            mechanisms are inheritance of shared genetic material and
            environmental pressures."</font><br>
          <br>
          So this is presented by Spike (2020) as an alternative to the
          tripartition between descriptive (p-)categories, comparative
          (g-)concepts, and innate natural-kind categories. <br>
          <br>
          However:<br>
          <br>
          (i) Dahl and Spike do not really suggest that such "clusters"
          can serve as language-particular descriptive categories (the
          English Perfect still needs to be distinguished from the
          Spanish Perfect, because they don't have exactly the same
          conditions of use)<br>
          <br>
          (ii) HPC theory does not help us understand how generative
          grammar operates (the main reason I introduced the notion of a
          "natural-kinds programme" was that I wanted to explain why
          generative linguists are doing what they are doing; e.g. here:
          <a class="moz-txt-link-freetext" href="https://dlc.hypotheses.org/1012">https://dlc.hypotheses.org/1012</a>)<br>
          <br>
          (iii) Even though the Dahlian tense-aspect clusters are of
          course extremely interesting typological generalizations, we
          do not understand their "homeostatic causal mechanisms" well.<br>
          <br>
          (iv) Clearly, in order to arrive at </span></span><span
        data-offset-key="5l440-1-0"><span data-text="true">Dahlian
          clusters, one needs comparative concepts of the token-based
          type, e.g. questionnaire translations, or parallel texts.
          There is no counterpart to this in biological HPCs – the
          "similarities" are not defined in the same (semi-arbitrary)
          way as in linguistics.<br>
          <br>
          (v) Spike argues that</span></span><span
        data-offset-key="98muu-0-0"><span data-text="true"> “</span></span><span><span
          data-offset-key="98muu-1-0"><span data-text="true">The</span></span></span><span
        data-offset-key="98muu-2-0"><span data-text="true"> utility of
          some kind does not require clear-cut, exceptionless
          definitions, but rather a track record of being used in
          successful inferences... Agronomists can tell you what to
          plant, geologists have a good idea of where to look for
          oil...” </span></span><span data-offset-key="5l440-1-0"><span
          data-text="true"></span></span><span
        data-offset-key="5l440-1-0"><span data-text="true"></span></span><span
        data-offset-key="5l440-1-0"><span data-text="true"><br>
          <br>
          But while agronomists and geologists have had successes which
          are evident from usesful applications, the same can hardly be
          said about theoretical linguistics. So we don't have an
          independent way of assessing how successful or concepts are.<br>
          <br>
          So while Spike (2020) made some interesting contributions
          (just like Round & Corbett 2020, on which see
          <a class="moz-txt-link-freetext" href="https://dlc.hypotheses.org/2415">https://dlc.hypotheses.org/2415</a>), there's no reason to think
          that there is a problem with the usual way of <a
            moz-do-not-send="true"
            href="https://benjamins.com/catalog/alal.20032.has">dealing
            with uniqueness</a> – but on the other hand, I also wish
          Erich a lot of success with his attempts at having his cookies
          and eat them too :-) Maybe it will eventually turn out that
          both (or all three) approaches are right, but for different
          domains.<br>
          <br>
          Best,<br>
          Martin<br>
          <br>
          References<br>
          <br>
        </span></span>
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      <p class="MsoNormal" style="margin-left:1.0cm;text-indent:-1.0cm"><span
          style="font-size:10.0pt;font-family:"Times New
          Roman",serif;
          mso-fareast-font-family:"Times New
          Roman";mso-ansi-language:EN-US" lang="EN-US">Boyd,
          Richard. 1999. Homeostasis, species, and higher taxa. In
          Wilson, R. (ed.), <i>Species:
            New interdisciplinary essays</i>. Cambridge MA: MIT Pres.</span></p>
      <p class="MsoNormal" style="margin-left:1.0cm;text-indent:-1.0cm"><span
          style="font-size:10.0pt;font-family:"Times New
          Roman",serif;
          mso-fareast-font-family:"Times New
          Roman";mso-ansi-language:EN-US" lang="EN-US">Dahl, Östen.
          2016. Thoughts on language-specific and crosslinguistic
          entities. <i>Linguistic
            Typology</i> 20(2). 427–437. (doi:</span><span
          style="font-size:10.0pt;
          font-family:"Times New
          Roman",serif;mso-fareast-font-family:"Times New
          Roman""><a
            href="https://doi.org/10.1515/lingty-2016-0016"><span
              style="color:blue;mso-ansi-language:EN-US" lang="EN-US">10.1515/lingty-2016-0016</span></a></span><span
          style="font-size:10.0pt;font-family:"Times New
          Roman",serif;
          mso-fareast-font-family:"Times New
          Roman";mso-ansi-language:EN-US" lang="EN-US">)</span></p>
      <p class="MsoNormal" style="margin-left:1.0cm;text-indent:-1.0cm"><span
          style="font-size:10.0pt;font-family:"Times New
          Roman",serif;
          mso-fareast-font-family:"Times New
          Roman";mso-ansi-language:EN-US" lang="EN-US">Round, Erich
          R. & Corbett, Greville G. 2020. Comparability and
          measurement in
          typological science: The bright future for linguistics. <i>Linguistic
            Typology</i>.
          De Gruyter Mouton 24(3). 489–525. (doi:</span><span
          style="font-size:10.0pt;
          font-family:"Times New
          Roman",serif;mso-fareast-font-family:"Times New
          Roman""><a
            href="https://doi.org/10.1515/lingty-2020-2060"><span
              style="color:blue;mso-ansi-language:EN-US" lang="EN-US">10.1515/lingty-2020-2060</span></a></span><span
          style="font-size:10.0pt;font-family:"Times New
          Roman",serif;
          mso-fareast-font-family:"Times New
          Roman";mso-ansi-language:EN-US" lang="EN-US">)</span></p>
      <p class="MsoNormal" style="margin-left:1.0cm;text-indent:-1.0cm"><span
          style="font-size:10.0pt;font-family:"Times New
          Roman",serif;
          mso-fareast-font-family:"Times New
          Roman";mso-ansi-language:EN-US" lang="EN-US">Spike,
          Matthew. 2020. Fifty shades of grue: Indeterminate categories
          and induction in
          and out of the language sciences. </span><i><span
            style="font-size:10.0pt;
            font-family:"Times New
            Roman",serif;mso-fareast-font-family:"Times New
            Roman"">Linguistic
            Typology</span></i><span
          style="font-size:10.0pt;font-family:"Times New
          Roman",serif;
          mso-fareast-font-family:"Times New Roman"">. De
          Gruyter Mouton 24(3). 465–488.
          (doi:<a href="https://doi.org/10.1515/lingty-2020-2061"><span
              style="color:
              blue">10.1515/lingty-2020-2061</span></a>)</span></p>
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      <span data-offset-key="5l440-1-0"><span data-text="true"></span></span><span
        data-offset-key="5l440-1-0"><span data-text="true"> </span></span></div>
    <br>
    <pre class="moz-signature" cols="72">-- 
Martin Haspelmath
Max Planck Institute for Evolutionary Anthropology
Deutscher Platz 6
D-04103 Leipzig
<a class="moz-txt-link-freetext" href="https://www.shh.mpg.de/employees/42385/25522">https://www.shh.mpg.de/employees/42385/25522</a></pre>
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