Advantages in exploring a new environment with the left eye in lizards

Area of Science:

• Ethology
• Neuroscience
• Comparative Psychology

Background:

• Lateralization of brain function is observed across many vertebrate species.
• The common wall lizard (Podarcis muralis) shows a preference for using its left eye during spatial tasks.
• Understanding eye preference in lizards can reveal insights into sensory processing and behavioral strategies.

Purpose of the Study:

• To investigate the role of eye preference in spatial exploration and maze navigation in Podarcis muralis.
• To determine if left-eye or right-eye monocular vision affects exploration speed and decision-making.
• To explore the potential link between lateralization of spatial stimuli and behavioral efficiency.

Main Methods:

• 44 adult wild Podarcis muralis lizards were subjected to a temporary monocular condition.
• Lizards explored an unknown maze for 20 minutes while their movements and turns were recorded.
• One eye was patched (right or left) to create monocular vision conditions.

Main Results:

• Lizards using their left eye (right eye patched) moved faster through the maze compared to those using their right eye (left eye patched).
• This speed advantage was observed during both leftward and rightward turns at T-junctions.
• Female lizards with their left eye covered exhibited increased hesitation at maze intersections, indicating indecision.

Conclusions:

• Podarcis muralis lizards exhibit faster and more efficient maze exploration when using their left eye, suggesting a left-eye/right-hemisphere advantage for spatial processing.
• The findings support the hypothesis of lateralization for processing spatial stimuli in this species.
• Left-hemisphere control via the right eye may be less efficient for rapid spatial navigation in this lizard species.