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  • Print publication year: 2008
  • Online publication date: June 2012

51 - Logic and Biology: Emotional Inference and Emotions in Reasoning

Summary

The unrefined and sluggish mind of Homo Javanensis Could only treat of things concrete and present to the senses

W. V. Quine

Tropisms and Transitions: Some Leading Questions

Before planning and reasoning, there were tropisms. Tropisms have functions and make use of information detected, but they don't, I assume, involve any actual reasoning. Somewhere along the course of evolution, and at some time in any one of us on the way from zygote to adult, some forms of detection became beliefs, and some tropisms turned into reasoned desires. And at some stage – perhaps, if Quine is right, with Homo javanensis – we became adept at processing information, that yet fell short of the power to abstract and generalize. What selective pressures can we then suppose to have effected in our brains, since then, the innovations required to bring us the capacity for fully abstract and general reasoning?

I take for granted that reasoning is something we do; that much or most of what we do is influenced by emotion; that psychology is interested in everything we do; and that psychology is a branch of biology. These breezy premises raise a number of questions.

  1. What kind of connection might there be between biology and rationality?

  2. More specifically, how does the normativity of logic relate to its biological origins? Is there not, in the very idea of such a connection, something akin to the naturalistic fallacy?

  3. If our capacity for inference is in part a legacy of natural selection, are there specific emotional mechanisms that serve to influence reasoning at the proximate level?

  4. […]

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