23 avrHumans do not possess a visual sense of approximate number23 avr 2012
With Steven Dakin, UCL Institute of Ophthalmology
There is current interest in how we are able to make an estimate of the approximate number of objects in a scene: existing evidence suggests that we may have a dedicated "visual number" sense that may even be linked to mathematical ability. In this talk I will present evidence from my lab that, contrary to this position, human sense of number is not independent of our sense of space/distance and that our ability to estimate one depends on the other. This implicates a common perceptual metric, and we describe one candidate based on the relative output of high and low spatial frequency-tuned filters (emulating the operation of visual neurons in the geniculate and primary visual areas). This simple model can explain a range of perceptual phenomena associated with approximate number estimation.
Site : Salle de réunion du LPP, H432, 4ème étage,
Centre Biomédical des Saints Pères
45 rue des Sts Pères, 75006 Paris