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Bhalla, M., & Proffitt, D.R. (2000). Geographical slant perception: Dissociation and coordination between explicit awareness and visually guided actions. In Y. Rossetti and A. Revonsuo (Eds.), Dissociation but Interaction between Nonconscious and Conscious Processing. Amsterdam: John Benjamins.

In four experiments, it was shown that hills appear steeper to people who are encumbered by wearing a heavy backpack (Experiment 1), are fatigued (Experiment 2), are of low physical fitness (Experiment 3), or are elderly and/or in declining health (Experiment 4). Visually guided actions are unaffected by these manipulations of physiological potential. Although dissociable, the awareness and action systems were also shown to be interconnected. Recalibration of the transformation relating awareness and actions was found to occur only over long-term changes in physiological potential (fitness level, age and health) but not with transitory changes (fatigue and load). Findings are discussed in terms of a time-dependent coordination between the separate systems that control explicit visual awareness and visually guided action.

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