Orientation and lateralized cue use in pigeons navigating a large indoor environment

Area of Science:

• Animal behavior
• Neuroscience
• Spatial cognition

Background:

• Pigeons (Columba livia) are known for their remarkable homing abilities.
• Understanding the sensory cues and neural mechanisms underlying avian navigation is crucial.

Purpose of the Study:

• To investigate how pigeons utilize visuo-spatial cues for navigation.
• To explore the role of global reference frames versus local cues in pigeon homing.
• To examine brain hemisphere lateralization in processing spatial information and landmarks.

Main Methods:

• Controlled laboratory experiments simulating homing conditions.
• Training pigeons to navigate to a goal using geometric and landmark cues.
• Testing navigation from familiar and unfamiliar release points with manipulated visual cues.
• Occluding the left or right eye to assess hemispheric contributions.

Main Results:

• Pigeons accurately determine bearings to non-visible goals using a global reference frame alone.
• Searching activity peaked at the location predicted by the global reference frame, irrespective of eye used.
• The right brain hemisphere ignored landmark alterations, while the left hemisphere showed distraction and adaptation to changed landmarks.

Conclusions:

• A geometric global visual reference frame is sufficient for accurate pigeon navigation.
• Both brain hemispheres possess a competent global spatial reference system.
• The left brain hemisphere exhibits specialized processing for object features and landmark changes, indicating functional lateralization.