Planarian shows decision-making behavior in response to multiple stimuli by integrative brain function.

Area of Science:

• Neuroscience
• Animal Behavior
• Evolutionary Biology

Background:

• Planarians possess a simple yet organized brain with diverse neurons.
• They exhibit behaviors like phototaxis and thermotaxis in response to stimuli.
• Previous research lacked methods to assess higher brain functions like signal integration.

Purpose of the Study:

• To investigate if planarians can integrate multiple external signals for behavioral strategy selection.
• To develop and utilize novel behavioral assays for planarian research.

Main Methods:

• Developed chemotaxis and thigmotaxis/kinesis tracking assays.
• Utilized regeneration-dependent conditional gene knockdown (Readyknock) to assess neural activity.
• Presented simultaneous binary stimuli (light, chemoattractant) to observe behavioral prioritization.

Main Results:

• Neural activity in the brain is essential for chemotactic and thigmotactic behaviors.
• Planarians exhibit a hierarchy of behavioral responses to competing stimuli.
• Behavioral choices shift based on stimulus intensity, indicating integration of sensory information.

Conclusions:

• The planarian brain processes external signals to produce appropriate behaviors.
• Planarians demonstrate the capacity to integrate multiple external signals for adaptive behavioral adjustments.