Gender differences in cerebral metabolism for color processing in mice: A PET/MRI Study

Area of Science:

• Neuroscience
• Vision Science
• Comparative Biology

Background:

• Color processing is fundamental to mammalian vision.
• Previous studies suggested gender differences in human color processing lateralization.
• Functional transcranial Doppler ultrasound indicated distinct hemispheric patterns for blue/yellow color opponency between sexes.

Purpose of the Study:

• To investigate sex-specific differences in brain color processing using an animal model.
• To explore the neural pathways and lateralization patterns associated with blue light stimulation in male and female mice.
• To establish a foundation for understanding the role of sex differences in brain disease.

Main Methods:

• Utilized small animal positron emission tomography and magnetic resonance imaging (PET/MRI) in mice.
• Measured [18F]fluorodeoxyglucose ([18F]FDG) uptake under blue and yellow light stimulation versus darkness.
• Employed statistical parametric mapping (SPM) for analyzing brain activity and metabolic connectivity.

Main Results:

• Observed a reversed pattern compared to human studies: male mice showed left visual cortex dominance for blue light via the right eye.
• Female mice exhibited right visual cortex dominance for blue light via the left eye.
• Metabolic connectivity patterns differed significantly between sexes, with distinct intra- and inter-hemispheric spread of activation in response to blue light.

Conclusions:

• Demonstrated sex-specific lateralization of color processing in the mouse brain.
• Highlighted differences in visual cortex activation and prefrontal cortex connectivity related to color perception between males and females.
• Suggests the potential for this animal model to elucidate the impact of sex differences on neurological disorders.