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The photosensitive phase acts as a sensitive window for seasonal multisensory neuroplasticity in male and female starlings

Orije, J. E.; Cardon, E.; Hamaide, J.; Jonckers, E.; Darras, V. M.; Verhoye, M.; Van der Linden, A.

2021-01-21 animal behavior and cognition
10.1101/2021.01.21.427111 bioRxiv
Show abstract

Traditionally, research unraveling seasonal neuroplasticity in songbirds has focused on the male song control system and testosterone. We longitudinally monitored the song and neuroplasticity in male and female starlings during multiple photoperiods using Diffusion Tensor and Fixel-Based techniques. These exploratory data-driven whole-brain methods resulted in a population-based tractogram uncovering microstructural sexual dimorphisms in the song control system and beyond. Male brains showed microstructural hemispheric asymmetries, whereas females had higher interhemispheric connectivity, which could not be attributed to brain size differences. Only females with large brains sing but differ from males in their song behavior by showing involvement of the hippocampus. Both sexes experienced multisensory neuroplasticity in the song control, auditory and visual system, and the cerebellum, mainly during the photosensitive period. This period with low gonadal hormones might represent a sensitive window during which different sensory and motor systems in telencephalon and cerebellum can be seasonally re-shaped in both sexes.

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