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Abstract:
Acetylcholine (ACh) has been implicated in a wide variety of
tasks involving attentional processes and plasticity. Following
extensive animal studies, it has previously been suggested that
ACh reports on
uncertainty
and controls hippocampal, cortical and cortico-amygdalar
plasticity. We extend this view and consider its effects on
cortical representational inference, arguing that ACh controls
the balance between bottom-up inference, influenced by input
stimuli, and top-down inference, influenced by contextual
information. We illustrate our proposal using a hierarchical
hidden Markov model.
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