Threat perception and targeting: the brainstem-amygdala-cortex alarm system in action?

Area of Science:

• Neuroscience
• Visual Perception
• Threat Detection

Background:

• Optimizing responses to physical threats is crucial for survival.
• The specific influence of threat perception on visually guided actions remains under-explored.

Purpose of the Study:

• To investigate how threat perception affects the visual guidance of action, specifically in a targeting task.
• To identify the visual and neural mechanisms underlying threat perception's influence on action.

Main Methods:

• Participants performed a targeting task under varying conditions of threat perception.
• Visual stimuli were presented centrally or peripherally, with or without threat cues.
• Hemifield presentation and S-cone isolation were used to probe visual pathways.

Main Results:

• Threat perception improved targeting performance for peripheral targets compared to central targets.
• This enhancement was absent in non-targeting tasks or after positive stimuli.
• A nasal versus temporal visual hemifield asymmetry was observed.
• The effect disappeared when using S-cone isolated stimuli.

Conclusions:

• Threat perception modulates visually guided targeting, favoring peripheral information processing.
• The superior colliculus, involved in threat detection, likely mediates this effect via a visual-field asymmetric pathway.
• This pathway bypasses direct S-cone retinal input, suggesting a role in a rapid brainstem-amygdala-cortex alarm system.