Descending pathways increase sensory neural response heterogeneity to facilitate decoding and behavior

Area of Science:

• Neuroscience
• Computational Neuroscience
• Sensory Systems

Background:

• Heterogeneous spiking responses in similarly tuned neurons are widely observed but their functional significance remains poorly understood.
• Understanding neural response variability is crucial for deciphering information processing in sensory systems.

Purpose of the Study:

• To investigate the functional role of response heterogeneity in neural populations.
• To determine if this heterogeneity benefits downstream processing and behavior generation.

Main Methods:

• Performed multi-unit recordings from electrosensory pyramidal cells in *Apteronotus leptorhynchus*.
• Analyzed neural responses before and after inactivation of descending pathways to assess the impact on coding properties.

Main Results:

• Observed highly heterogeneous spiking responses across similarly tuned sensory pyramidal cells.
• Demonstrated that neural response heterogeneity enhances decoding robustness against added noise.
• Found that descending pathways actively promote response heterogeneity within neuronal populations.

Conclusions:

• Response heterogeneity in sensory neurons is not random but serves a beneficial function.
• This heterogeneity is actively promoted by descending pathways and aids in generating behavior that accurately reflects stimulus dynamics.