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Fechner's Elusive Parallel Law

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Chapter Summary

In this chapter, the author examines whether V1 model helps us to understand the relationship between psychophysical judgements and neural population response for suprathreshold changes in natural visual images. The author extends the V1 modelling to show explicitly how a single model with few parameters can link 'classical' psychophysical experiments on contrast discrimination to the experiments which measure the perceived magnitudes of changes in, for example, the shapes, colours, locations and numbers of objects in natural scenes. The author discusses how the 'transducer function', which is modelled as underlying the dipper function, is related to the population response of V1 neurons. The chapter concentrates on a newer set of experimental results, obtained with stimuli in which the various changes are systematically changed to provide a well-distributed range of rating data to challenge the model.

Keywords:neural population response; perceived magnitudes of changes; suprathreshold changes; transducer function; V1 modelling; V1 neurons



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