Individual-level, context-dependent handedness in the desert locust

Area of Science:

• Zoology
• Neuroscience
• Animal Behavior

Background:

• While sensory and motor control asymmetries exist in insects, direct evidence for functional left-right asymmetry (handedness) comparable to vertebrates is lacking.
• Previous research has not definitively established handedness in insect limb control.

Discussion:

• Locusts display a bias in forelimb choice when reaching across a gap, indicating context-dependent handedness.
• This forelimb bias is observed during targeted placement but not during general walking or immediate pre-reaching movements.
• The observed handedness is individual-specific, with some locusts favoring the right forelimb and others the left.

Key Insights:

• Locusts demonstrate functional handedness in a specific motor task: reaching across a gap.
• Visual input appears to trigger the switch to biased forelimb use for targeted placement.
• Individual variation in handedness strength and preference is significant.

Outlook:

• Further research can explore the neural mechanisms underlying this context-dependent handedness in locusts.
• Investigating how environmental factors influence the development and expression of insect handedness is warranted.
• Comparative studies could reveal the evolutionary origins of limb control asymmetries across different insect species.