Summary
This study reveals that innate fear of heights in mice is mediated by a subcortical, non-image-forming visual pathway through the ventral lateral geniculate nucleus rather than the primary visual cortex, independent of vestibular input. While focused on fear neuroscience, the findings are relevant to understanding how non-image-forming visual circuits—related to those involved in circadian and alertness responses—can drive rapid behavioral and physiological effects.
Key Findings
- Fear of heights in mice is driven by visual input but does not require image-forming processing via the primary visual cortex.
- A subcortical circuit from the ventral lateral geniculate nucleus (vLGN) to the lateral/ventrolateral periaqueductal gray (l/vlPAG) is necessary and sufficient for height-induced defensive behaviors.
- A separate superior colliculus → lateral posterior thalamic nucleus pathway inhibits (suppresses) the defensive response to height threats, indicating bidirectional subcortical modulation.
- Peripheral vestibular input was found to be nonessential for the expression of fear of heights in naïve mice.
Categories
The Science of Light: Identifies a non-image-forming subcortical visual circuit (vLGN→l/vlPAG) mediating innate fear responses, advancing understanding of how light-driven visual signals influence behavior beyond image formation.
Author(s)
W Shang, S Xie, W Feng, J Jia, X Cao, Z Li, J Li, Y Gu
Publication Year
2023
Related Publications
The Science of Light
- Phototransduction by retinal ganglion cells that set the circadian clock
- Color appearance models
- The mammalian circadian timing system: organization and coordination of central and peripheral clocks
- Diminished pupillary light reflex at high irradiances in melanopsin-knockout mice
- Melanopsin is required for non-image-forming photic responses in blind mice