Fourier Analysis of Cerebral Metabolism of Glucose Revealed Gender Differences in Ventral and Dorsal Streams for Colour Processing in Mice

Fourier analysis of regional cerebral metabolic rate of glucose (CMRglc) as estimated by measurement of standardized uptake values (SUVs) of [18F]fluorodeoxyglucose ([18F]FDG) using functional positron emission tomography magnetic resonance imaging (fPET/MRI) revealed activation patterns during white light and colour stimulation in male and female mice, respectively. Spectral density curves of the cortical and subcortical peaks demonstrated wavelength-differencing for luminance and chromatic opponency in the ventral stream in male mice, but frequency-differencing in the dorsal stream in female mice. Male mice demonstrated subcortico-cortical bottom-up feed-forward system for light and colour processing, while in female mice there was a cortico-subcortical top-bottom feed-back system.
Fourier time series analysis was helpful to improve both spatial and temporal resolution of PET/MRI for study of colour processing in the visual system. It demonstrated computation of colour processing as conscious experience, and has a wide range of applications including in artificial intelligence and quantum mechanics.