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Human subcortical pathways automatically detect collision trajectory without attention and awareness.

Fanhua Guo1,2, Jinyou Zou1,2,3, Ye Wang1,2

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The human brain can automatically detect collision trajectories using subcortical pathways, even without attention or awareness. This "blindsight" mechanism aids in survival by processing visual threats subconsciously.

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Area of Science:

  • Neuroscience
  • Visual Perception
  • Cognitive Science

Background:

  • Collision detection is crucial for survival.
  • Subcortical visual pathways play a role in processing rapid environmental changes.
  • The influence of attention and consciousness on subcortical collision detection remains unclear.

Purpose of the Study:

  • To investigate the role of attention and consciousness in detecting collision trajectories.
  • To examine subcortical pathway involvement in automatic collision detection.
  • To explore the functional significance of the tectofugal pathway in threat perception.

Main Methods:

  • High-resolution functional magnetic resonance imaging (fMRI) at 7 Tesla was employed.
  • Healthy participants and hemianopic patients were studied.
  • Behavioral discrimination tasks and pupil size changes were measured alongside neural activity.

Main Results:

  • Participants accurately discriminated collision from near-miss trajectories, with pupil size correlating with sensitivity.
  • Subcortical pathways, including the superior colliculus (SC), ventromedial pulvinar (vmPul), and ventral tegmental area (VTA), showed collision-sensitive responses.
  • These responses occurred even without attention, and in hemianopic patients, ipsilesional SC and VTA activated for stimuli in their scotoma.
  • Stronger SC responses correlated with better behavioral performance, independent of awareness.

Conclusions:

  • Human tectofugal pathways automatically detect collision trajectories, irrespective of attention and awareness.
  • This subconscious processing supports a