Discover how the brain’s response to the unseen world is reshaped, as recent findings reveal the intriguing ways in which passive visual experiences can alter our neural activity patterns.
– by James
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Repeated passive visual experience modulates spontaneous and non-familiar stimuli-evoked neural activity.
Niraula et al., Sci Rep 2023
DOI: 10.1038/s41598-023-47957-1
What’s New: This study investigates how repeated exposure to a familiar visual stimulus affects neural activity and behavior in mice. It specifically examines changes in the mouse visual cortex in response to a familiar 45° orientation-grating stimulus and its impact on neurons tuned to familiar and non-familiar stimuli.
Importance: Understanding the neural basis of familiarity and novelty detection is crucial for insights into learning, memory, and adaptive behavior. This research sheds light on how familiarity influences neural selectivity and functional connectivity, which has implications for how the brain processes repeated experiences.
Contribution to Literature: The study reveals that familiarity with a stimulus leads to a reduction in selectivity for neurons tuned to that stimulus, while increasing selectivity for neurons tuned to a 90° stimulus. Neurons tuned to orientations 45° apart from the familiar stimulus become more dominant in local functional connectivity. Additionally, the study finds that neurons showing stimulus competition have a slight increase in responsiveness to natural images. It also demonstrates that the similarity between evoked and spontaneous activity increases with familiarity, suggesting the formation of an internal model based on repeated experiences.
Numerical Details: The study does not provide specific numerical results in the abstract, but it indicates qualitative changes in neural selectivity, functional connectivity, and responsiveness to visual stimuli.