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      On the Meaning(s) of Perceived Complexity in the Chemical Senses

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      Chemical Senses
      Oxford University Press (OUP)

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          The magical number seven plus or minus two: some limits on our capacity for processing information.

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            The many faces of configural processing.

            Adults' expertise in recognizing faces has been attributed to configural processing. We distinguish three types of configural processing: detecting the first-order relations that define faces (i.e. two eyes above a nose and mouth), holistic processing (glueing the features together into a gestalt), and processing second-order relations (i.e. the spacing among features). We provide evidence for their separability based on behavioral marker tasks, their sensitivity to experimental manipulations, and their patterns of development. We note that inversion affects each type of configural processing, not just sensitivity to second-order relations, and we review evidence on whether configural processing is unique to faces.
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              Predicting odor pleasantness from odorant structure: pleasantness as a reflection of the physical world.

              Although it is agreed that physicochemical features of molecules determine their perceived odor, the rules governing this relationship remain unknown. A significant obstacle to such understanding is the high dimensionality of features describing both percepts and molecules. We applied a statistical method to reduce dimensionality in both odor percepts and physicochemical descriptors for a large set of molecules. We found that the primary axis of perception was odor pleasantness, and critically, that the primary axis of physicochemical properties reflected the primary axis of olfactory perception. This allowed us to predict the pleasantness of novel molecules by their physicochemical properties alone. Olfactory perception is strongly shaped by experience and learning. However, our findings suggest that olfactory pleasantness is also partially innate, corresponding to a natural axis of maximal discriminability among biologically relevant molecules.
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                Author and article information

                Contributors
                (View ORCID Profile)
                Journal
                Chemical Senses
                Oxford University Press (OUP)
                0379-864X
                1464-3553
                September 2018
                August 24 2018
                July 16 2018
                September 2018
                August 24 2018
                July 16 2018
                : 43
                : 7
                : 451-461
                Affiliations
                [1 ]Crossmodal Research Laboratory, Oxford University, Anna Watts Building, University of Oxford, Oxford, UK
                Article
                10.1093/chemse/bjy047
                30010729
                541191b3-8e83-48a1-aa9f-9790b0eba85e
                © 2018

                https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model

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