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- W3204361307 abstract "Abstract Recent results show human early visual cortex response amplitudes monotonically increase with numerosity (object number), regardless of object size and spacing. However, numerosity is typically considered a high-level visual or cognitive feature, while early visual responses follow image contrast in the spatial frequency domain. We found that, at a fixed contrast, aggregate Fourier power (at all orientations and spatial frequencies) follows numerosity closely but nonlinearly with little effect of object size, spacing or shape. This allows straightforward numerosity estimation from spatial frequency domain image representations. We used 7T fMRI to show monotonic responses originate in primary visual cortex (V1) at the stimulus’s retinotopic location, and follow aggregate Fourier power more closely than numerosity. Truly numerosity tuned responses emerge after lateral occipital cortex and are independent of retinotopic location. We propose that numerosity’s straightforward perception and neural responses may have built on behaviorally beneficial spatial frequency analyses in simpler animals." @default.
- W3204361307 created "2021-10-11" @default.
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- W3204361307 date "2021-03-29" @default.
- W3204361307 modified "2023-09-26" @default.
- W3204361307 title "Transformation from local image contrast to location-independent numerosity tuning in human extrastriate cortex" @default.
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