Input-Specific Gain Modulation by Local Sensory Context Shapes Cortical and Thalamic Responses to Complex Sounds

Area of Science:

• Neuroscience
• Auditory Processing
• Computational Neuroscience

Background:

• Sensory neurons are typically modeled with fixed receptive fields.
• Understanding how neurons process complex sounds is crucial for auditory perception.

Purpose of the Study:

• To investigate context-dependent receptive field properties in auditory neurons.
• To determine if incorporating spectrotemporal context improves response predictions.

Main Methods:

• Analysis of receptive field weights in auditory cortical and thalamic neurons.
• Modeling neuronal responses to stationary complex sounds with and without contextual information.

Main Results:

• Receptive field element weights are modulated by local spectrotemporal sound patterns.
• Context-dependent models significantly improve predictions of neuronal responses.
• Neuronal responsiveness is enhanced by coinciding sounds and reduced by preceding similar sounds.

Conclusions:

• Auditory neuron receptive fields are dynamic and context-dependent.
• Spectrotemporal context influences neuronal gain, not just output.
• This "input-specific gain" modulation may be a general sensory processing mechanism.