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- Crawford L. Elder (1998). What Sensory Signals Are About. Analysis 58 (4):273-276.In ‘Of Sensory Systems and the “Aboutness” of Mental States’, Kathleen Akins (1996) argues against what she calls ‘the traditional view’ about sensory systems, according to which they are detectors of features in the environment outside the organism. As an antidote, she considers the case of thermoreception, a system whose sensors send signals about how things stand with themselves and their immediate dermal surround (a ‘narcissistic’ sensory system); and she closes by suggesting that the signals from many sensory systems may not in any familiar sense be about anything at all. Her presentation of the issues, however, overlooks resources available to ‘the traditional view’—or so I shall argue. Akins’s own thumbnail sketch of what is wrong with the traditional view is that it asks, concerning a given sensory system, ‘what is it detecting?’, when we should instead be asking ‘what is it doing?’ (352). Her point is that on the traditional view the function of a sensory system—what it's ‘for’—is to detect or indicate (values of) features of the outside environment. But at least on one version of the traditional view—namely Ruth Millikan’s—this would never be the sole or main proper function of a sensory system. (Akins does not list Millikan as a traditionalist, but Millikan fits squarely Akins’s description of them, since she believes in a naturalistic theory of aboutness and thinks it should begin with the senses.) For Millikan (1989, 1993), the proper function of a sensory system is in the first instance enabling behavioural systems—in the simplest case, motor routines—to perform their proper function. This they do, roughly, by switching on and steering the behavioural routines. Where features of the outside environment come in is as Normal (= assumed-by-the-design) conditions for the successful performance of the sensory system's proper function. That is, the only strategy for switching on and steering that is simple enough for evolution to have hit upon it, and reliable enough for evolution to have liked it, is a strategy which gears the steering to (values of) features of the outside environment. But as soon as one starts fleshing out the details of this story, one notices that they are probably quite different in the case of thermoreception from how they are with ‘distance’ senses such as vision and olfaction--a point which Akins overlooks..
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A representationalist about qualia takes qualitative states to be aspects of the intentional content of sensory or sensory-like representations. When you experience the redness of an apple, they say, your visual system is merely representing that there is a red surface at such-and-such a place in front of you. And when you experience a red afterimage, your visual system is (non-veridically) representing something similar (Harman 1990, Dretske 1995, Tye 1995, Lycan 1996). Your sensory state does not literally have an intrinsic quality of phenomenal redness, just as you do not have a hairy mental state when you occurrently believe that Santa Claus is hairy. Judging by the literature, it is quite plausible to claim that the nature of occurrent beliefs is exhausted by their representational (and functional) characteristics.1 Why is it that this “pure representation” ploy is so much less plausible in the case of sensory states? Typically, the reason given is that belief states are not qualitative while sensory states are, as revealed by introspection. Qualitativity, it is further maintained, cannot be purely representational – this is the intuition the representationalist must fight. In this paper I want to focus on a feature of sensory states, distinct from but related to their qualitativity, that encourages the anti-representationalist to object to the representational thesis. I shall call this feature “inhereness.” (It is one of the things that leads some to follow Descartes in claiming the mind is non-spatial.) Instances of sensory..
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Discussion of Crawford L. Elder, What sensory signals are about
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