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Anti-Capitalism: A Guide to the Movement (Revolutionary by George Monbiot

By George Monbiot

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2008). P3a is hypothesized to be generated by stimuli which change the content of the working memory. This attentional-driven neural activity may then be transmitted to brain areas associated with memory storage and subsequently generate the P3b. Supportively, time frequency analyses indicate that theta and alpha activity govern the relationship of the P3a to attention and P3b to memory processing (Intriligator and Polich, 1994, Spencer and Polich, 1999, Polich, 2007). The P3a appears to be sensitive to specific neurotransmitters; in particular dopamine and glutamate have been implicated in the mediation of P3a.

2006). As reviewed above, alpha oscillatory activity is associated with attention, which is impaired in schizophrenia. Investigation of evoked and induced alpha oscillations in schizophrenia revealed reduced alpha power and impaired ability to synchronize the phase of ongoing alpha activity. Greater trial-by-trial variability may be due the interference of ongoing background brain activity with the recruitment of neural systems which is indispensable for the processing of sensory information.

2009a). , 2008a). , 2001). , 2001). These subsets of inhibitory GABAergic interneurons, located in hippocampal and cortical areas, are proposed to play a primary role in the generation of the gamma oscillations (Uhlhaas and Singer, 2010). Frequency range Primary generators Function Alpha (8-12 Hz) Thalamus, hippocampus, cortical regions Theta (4-7 Hz) Cortico-hippocampal circuits Beta (13-10 Hz) Overall cortical structures Gamma (30-200 Hz) Hippocampal and cortical Inhibition, attention, consciousness Perceptual processing, learning, memory, synaptic plasticity sensory gating, attention, and long-term synchronization Perception, selective attention, consciousness, encoding and retrieval of memory traces Table 1.

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