Adaptive judgmental processes

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Theoretical and experimental work is planned on a number of different problems in the broad areas of psychophysics, judgement, and decision-making. The primary aim is to determine the fundamental properties of comparative judgments with perceived, numerical, and remembered alternatives. A continuing focus of this long-term research programme is the further development of quantitative models that permit explicit expressions for response times, response accuracy, and confidence. Extensions of these models, both through computer simulation and formal mathematical development, to the multi-alternative case are underway, as are a series of experiments with two, three and four stimulus alternatives. These models will then be empirically examined in the context of continuing experimental work which focuses on the determining how the instructions used in comparison experiments interact with properties of the stimuli to be compared (the semantic congruity effect), the relationships between how we perceive simple sensory events and how we remember them (memory psychophysics), the spatial components in the mental representations of numbers and symbols (SNARC effect), and how we arrive at a feeling of the confidence in the correctness of our decisions and judgements and how closely our expression of confidence relates to actual accuracy of our performance (the calibration of confidence).