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• W2115380926 abstract "The study builds on the propositions introduced in a companion paper on the neuropharmacology of cognition and its relation to key findings in psychiatry. Cognitive inhibition is often invoked to explain performance in psychiatric illness. Yet it remains only a general conceptual model of executive dysfunction. Premotor theory proposes both neuroanatomical and neuropharmacological equivalents of conscious and unconscious processes. The interaction between monoaminergic and cholinergic neurotransmission is stated to have an inverse effect on these two fundamental psychological processes. If one conceives of cognitive inhibition as a failure to voluntarily suppress unconscious prepotent responses, then a deficit in monoaminergic antagonism of cholinergic facilitated prepotent responses accounts for the observed behavioural phenotypes. The plasticity of behaviour is further hypothesized to have an equivalent in intracellular signalling leading to plastic changes in neural networks. Apart from inhibition of prepotent responses it permits the formulation of new behavioural phenotypes. At the receptor level Gi-Gq/11 transduction coupling is proposed to mediate this effect. A hypofunctioning monoaminergic system is thought to underlie the clinical pictures of major depression and ADHD. The neurocognitive deficits of depression include memory loss, poor concentration and rumination. ADHD is characterized by inattention, impulsivity and hyperactivity. Both these syndromes effectively respond to raising serotonin and dopamine levels, respectively. The core symptoms can usefully be attributed to an imbalance between the neuromodulatory effects of monoamines and ACh. Taking the model of monoaminergic–muscarinic receptor interactions presented previously and extended here, a new hypothesis is proposed for the core symptoms of ADHD. Accordingly, impulsivity and hyperactivity result from impaired dopaminergic inhibition and remodelling of muscarinic mediated prepotent responses. The model also predicts memory impairment in major depression by proposing that low serotonin levels in the neocortex is linked to focal hippocampal dysfunction. Hippocampal theta is proposed to trigger phasic monoaminergic activation involved in encoding of cortical traces and plasticity of propotent networks. It proposes a hypothesis for the enhancement of mood and behaviour induced by antidepressants is partly a response to plasticity of neural networks, that is, remodelling of cholinergic-mediated negative habitual behaviours." @default.
• W2115380926 created "2016-06-24" @default.
• W2115380926 creator A5068542840 @default.
• W2115380926 date "2007-01-01" @default.
• W2115380926 modified "2023-09-25" @default.
• W2115380926 title "Neurocognitive deficits in major depression and a new theory of ADHD: A model of impaired antagonism of cholinergic-mediated prepotent behaviours in monoamine depleted individuals" @default.
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• W2115380926 doi "https://doi.org/10.1016/j.mehy.2006.07.018" @default.
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