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Adaptation, not prediction, drives neuronal spiking responses in mammalian sensory cortex
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Adaptation, not prediction, drives neuronal spiking responses in mammalian sensory cortex
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Adaptation, not prediction, drives neuronal spiking responses in mammalian sensory cortex
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Paper
Adaptation, not prediction, drives neuronal spiking responses in mammalian sensory cortex
2025
Overview
Predictive coding (PC) hypothesizes that the brain computes internal models of predicted events and that unpredicted stimuli are signaled with prediction errors that feed forward. We tested this hypothesis using a visual oddball task. A repetitive sequence interrupted by a novel stimulus is a \"local\" oddball. \"Global\" oddballs defy predictions while repeating the local context, thereby dissociating genuine prediction errors from adaptation-related responses. We recorded neuronal spiking activity across the visual hierarchy in mice and monkeys viewing these oddballs. Local oddball responses largely followed PC: they were robust, emerged early in layers 2/3, and fed forward. Global oddball responses challenged PC: they were weak, absent in most visual areas, more robust in prefrontal cortex, emerged in non-granular layers, and did not involve inhibitory interneurons relaying predictive suppression. Contrary to PC, genuine predictive coding does not emerge early in sensory processing, and is instead exclusive to more cognitive, higher-order areas.Competing Interest StatementThe authors have declared no competing interest.Footnotes* Additional control analyses to bolster the observed effects (pupil responses to oddballs) have now been added. Title and intro/discussion have been edited for clarity.* https://dandiarchive.org/dandiset/000253/0.240503.0152
Publisher
Cold Spring Harbor Laboratory Press,Cold Spring Harbor Laboratory
