Deviance Distraction and Stimulus-Specific Adaptation in the Somatosensory Cortex Reduce with Experience

Area of Science:

• Neuroscience
• Sensory Perception
• Cognitive Science

Background:

• Exogenous attentional control relies on detecting surprising sensory changes.
• Stimulus-specific adaptation (SSA) is a proposed neural mechanism for change detection across sensory pathways.
• The relationship between SSA and perceptual experience is not well understood.

Purpose of the Study:

• To investigate how deviant sensory stimuli influence target signal detection.
• To explore the neural mechanisms of deviance detection in the somatosensory cortex.
• To assess the impact of stimulus-specific adaptation (SSA) on cross-modal perception.

Main Methods:

• A behavioral cross-modal paradigm in mice performing a visual detection task.
• Extracellular recordings from the primary somatosensory whisker cortex.
• Presentation of task-irrelevant whisker stimuli as standard or deviant.

Main Results:

• Deviant whisker stimuli caused a distraction effect: faster reaction times but worsened visual target detection.
• Enhanced neuronal responses (multiunit activity and local field potentials) to deviant stimuli were observed due to SSA.
• The correlation between behavioral distraction and neural responses was layer-specific, primarily in deeper cortical layers.
• Task experience and statistical distractor learning reduced the layer-specific effect of SSA on perception.

Conclusions:

• SSA contributes to deviance detection in the somatosensory cortex.
• The neural processing of deviant stimuli impacts cross-modal perceptual performance.
• Perceptual consequences of SSA are layer-specific and can be modulated by learning and experience.