Background white noise increases neuronal activity by reducing membrane fluctuations and slow-wave oscillations in...

Area of Science:

• Neuroscience
• Auditory System Research
• Sensory Processing

Background:

• The brain must maintain stable sensory representations despite noisy inputs.
• Background white noise (WN) is known to reduce responses to sounds, but the underlying neural mechanisms are unclear.

Purpose of the Study:

• To investigate how background white noise affects neuronal activity, membrane potential, and network oscillations in the mouse auditory pathway.
• To elucidate the brain mechanisms underlying sensory representation changes in the presence of noise.

Main Methods:

• Recording neuronal spiking activity and membrane potential in the mouse auditory cortex and thalamus.
• Analyzing local field potentials to assess network oscillations.
• Utilizing pharmacological manipulation to block acetylcholine signaling in the auditory cortex.

Main Results:

• Background WN increased spontaneous neuronal spiking in the auditory cortex and thalamus.
• WN reduced neural activity fluctuations, evident in both single-neuron membrane potential and local field potentials.
• Blocking acetylcholine signaling abolished the WN-induced increase in background activity and altered slow-wave oscillations.

Conclusions:

• Background white noise significantly impacts neural processing within the auditory pathway, rather than being filtered out.
• Cholinergic signaling plays a crucial role in mediating the sustained cortical activity changes induced by WN.
• These findings offer mechanistic insights into neural adaptation to noisy sensory environments.