CAT 2020 Slot 1 VARC: Rethinking the Animal Mind

For much of the twentieth century, comparative psychology was dominated by a cautious minimalism: an animal's behaviour should be explained by the simplest mechanism consistent with the evidence, and appeals to complex mental states such as planning, empathy or self-awareness were to be avoided unless no simpler account would do. This principle, associated with the psychologist C. Lloyd Morgan and often invoked as a corrective to the anthropomorphism of earlier naturalists, shaped decades of experimental design. Researchers who wanted to claim that a crow could plan for the future, say, were expected to rule out every alternative explanation involving conditioning, instinct or chance before such a claim could be entertained.

This caution produced genuine rigour, but critics have increasingly argued that it hardened into an asymmetric bias. The demand for exhaustive alternative explanations was, in practice, applied far more strictly to claims of animal sophistication than to claims of animal simplicity. A result suggesting complex cognition faced years of methodological gauntlet-running, while a result suggesting mere conditioning was frequently accepted without comparable scrutiny of whether a more complex explanation might in fact fit the data better. The philosopher Frans de Waal has called this asymmetry 'anthropodenial', the reflexive refusal to consider continuity between human and animal minds even where the evidence points that way, and has argued that it is no less a distortion than the anthropomorphism it was designed to prevent.

Recent decades of research have complicated the minimalist picture considerably. Caledonian crows have been shown to manufacture and modify tools for future use, storing hooked implements for problems they have not yet encountered, behaviour difficult to explain without invoking some form of anticipation. Octopuses, whose nervous systems evolved independently of the vertebrate lineage for over half a billion years, solve novel spatial puzzles and appear to have distinct behavioural dispositions across individuals, suggesting that flexible problem-solving is not a single evolutionary event but something that has arisen more than once by different routes. Elephants show behaviours around the bodies of dead herd members, lingering and touching remains, that researchers are reluctant to call grief outright but find hard to describe in purely mechanical terms.

None of this licenses a wholesale return to the loose anthropomorphism of the nineteenth century, when observers freely attributed human motives to animals on the basis of superficial resemblance. The point made by de Waal and others is more precise: parsimony is not the same as minimalism. A genuinely parsimonious explanation is the simplest one that accounts for all the evidence, not the one that assumes the least about the animal regardless of fit. When a simple conditioning account requires implausible auxiliary assumptions to explain, say, a crow's ability to solve a problem it has never encountered using a tool it fashioned for that purpose, insisting on the conditioning account is no longer parsimony but a different kind of bias, dressed in parsimony's clothing.

The practical upshot for researchers is a shift in evidentiary standard rather than a lowering of it: cognitive claims about animals still require rigorous testing and the elimination of simpler alternatives, but the testing must now be applied symmetrically, with claims of simplicity held to the same standard of fit as claims of sophistication, rather than granted a default presumption of correctness.