Context-dependent stimulus presentation to freely moving animals in 3D.

Area of Science:

• Neuroscience and Behavior
• Bioengineering and Instrumentation
• Sensory Ecology

Background:

• Controllable sensory stimuli are crucial for studying animal sensory processing, particularly in insects.
• Existing methods often limit experiments to walking or tethered-flying insects in controlled environments.
• Advances in real-time 3D tracking and computational power now allow for dynamic stimuli presentation to free-flying animals.

Purpose of the Study:

• To develop a flexible and robust experimental system for presenting dynamic sensory stimuli to free-flying insects in 3D space.
• To create a modular approach accommodating the complexity of real-time 3D experimental design, data acquisition, and stimulus control.
• To demonstrate the system's capability with dynamic acoustic and visual stimuli in a large 3D environment.

Main Methods:

• Partitioning the experimental system into self-contained, loosely coupled modules for design, data acquisition, and stimulus control.
• Developing a stand-alone application for creating 3D experimental scenarios with defined space-stimulus relationships.
• Implementing real-time control of stimuli based on the tracked 3D flight path and orientation of free-flying insects.

Main Results:

• Successfully demonstrated the presentation of dynamic acoustic cues to a free-flying parasitoid fly in a large 3D arena.
• Validated a test system capable of displaying complex visual stimuli controlled in real-time by object position and orientation.
• The modular design proved robust and flexible, allowing for easy integration of new experimental paradigms.

Conclusions:

• The developed modular system provides a powerful and adaptable platform for studying sensory processing in free-living animals.
• This approach significantly expands the possibilities for experimental designs, including learning paradigms, across various sensory modalities and animal locomotion.
• The methods are applicable to walking, swimming, and flying animals, paving the way for novel behavioral and neuroethological research.