The Neural Signature of Visual Learning Under Restrictive Virtual-Reality Conditions

Area of Science:

• Neuroscience
• Animal Behavior
• Virtual Reality

Background:

• Honey bees exhibit advanced visual learning and navigation.
• Virtual reality (VR) offers controlled environments to study animal cognition.
• Previous VR studies explored honey bee navigation and learning.

Purpose of the Study:

• To investigate honey bee color discrimination learning in a 2D VR environment.
• To identify the neural correlates of successful color learning in honey bees.
• To understand how learning in different VR scenarios affects gene expression.

Main Methods:

• Utilized a 2D VR setup with tethered honey bees under closed-loop conditions.
• Trained bees to discriminate vertical rectangles based on color and reinforcement.
• Analyzed brain tissue from learners and non-learners for immediate early gene (IEG) expression.

Main Results:

• Honey bees successfully learned to discriminate colors in the VR task.
• Successful learners showed downregulation of specific immediate early genes (Egr1, Hr38, kakusei) in the optic lobes and mushroom bodies.
• Gene expression patterns differed from those observed in 3D VR navigation tasks.

Conclusions:

• Color discrimination learning in honey bees creates a distributed neural signature along the visual processing pathway.
• This signature is consistent with an inhibitory trace, potentially linked to motor patterns.
• Learning in 2D VR for discrimination differs neurobiologically from 3D VR for navigation and exploration.