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Divergent midbrain circuits orchestrate escape and freezing responses to looming stimuli in mice
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Divergent midbrain circuits orchestrate escape and freezing responses to looming stimuli in mice
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Divergent midbrain circuits orchestrate escape and freezing responses to looming stimuli in mice
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Journal Article
Divergent midbrain circuits orchestrate escape and freezing responses to looming stimuli in mice
2018
Overview
Animals respond to environmental threats, e.g. looming visual stimuli, with innate defensive behaviors such as escape and freezing. The key neural circuits that participate in the generation of such dimorphic defensive behaviors remain unclear. Here we show that the dimorphic behavioral patterns triggered by looming visual stimuli are mediated by parvalbumin-positive (PV
+
) projection neurons in mouse superior colliculus (SC). Two distinct groups of SC PV
+
neurons form divergent pathways to transmit threat-relevant visual signals to neurons in the parabigeminal nucleus (PBGN) and lateral posterior thalamic nucleus (LPTN). Activations of PV
+
SC-PBGN and SC-LPTN pathways mimic the dimorphic defensive behaviors. The PBGN and LPTN neurons are co-activated by looming visual stimuli. Bilateral inactivation of either nucleus results in the defensive behavior dominated by the other nucleus. Together, these data suggest that the SC orchestrates dimorphic defensive behaviors through two separate tectofugal pathways that may have interactions.
In response to environmental threats, such as visual looming stimuli, mice either freeze or escape. Here the authors demonstrate that these two behaviors are mediated by separate tectofugal pathways formed by parvalbumin-positive neurons in the superior colliculus.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
/ 13/51
/ 14/35
/ 14/63
/ 64/110
/ 64/60
/ 9/74
/ Animals
/ Behavior
/ Circuits
/ Freezing
/ Freezing Reaction, Cataleptic
/ Humanities and Social Sciences
/ Lateral Thalamic Nuclei - cytology
/ Lateral Thalamic Nuclei - physiology
/ Male
/ Mice
/ Neurons
/ Nuclei
/ Science
/ Superior Colliculi - cytology
/ Superior Colliculi - physiology
/ Thalamus
