PSYCH 026: Electroencephalography in Psychiatry

About this episode

If imaging reveals structure, electroencephalography (EEG) captures activity in real time. This chapter explores how electrical signals generated by neuronal populations can be recorded from the scalp, offering a dynamic view of brain function.

In this episode, we examine how EEG reflects synchronised activity across neural networks, producing patterns that can be analysed in terms of frequency, amplitude, and coherence. These rhythms - from slow delta waves to fast gamma activity - represent different states of brain function.

We explore how EEG is used clinically, particularly in epilepsy and sleep medicine, but also its growing role in psychiatric research. Subtle alterations in brain rhythms have been associated with conditions such as schizophrenia, depression, and attention disorders.

A key theme is temporal resolution. Unlike structural imaging, EEG captures the brain as it unfolds moment by moment - revealing patterns of timing, synchrony, and disruption that are otherwise invisible.

However, EEG also has limitations. Its spatial precision is limited, and interpretation requires careful contextualisation. It offers a window into function, but not a complete map.

This chapter highlights the importance of timing in brain activity - showing that when signals occur, and how they synchronise, is as important as where they originate.

Key Takeaways

* EEG records electrical activity from neuronal populations in real time.

* Brain activity is reflected in rhythmic patterns across different frequencies.

* EEG provides high temporal resolution but limited spatial precision.

* It is widely used in epilepsy and sleep medicine, with growing psychiatric applications.

* Altered brain rhythms are associated with various psychiatric conditions.

* EEG reveals patterns of synchrony, timing, and network dynamics.

* Functional insight requires careful interpretation within clinical context.

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