How do alpha rhythms typically appear on an EEG?

Alpha rhythms are a specific type of brain wave pattern that can be observed on an electroencephalogram (EEG). They are characterized by their sinusoidal shape and typically manifest within a frequency range of 8 to 12 Hz. This frequency range is primarily associated with relaxed, calm, but alert states, often observed when a person is awake but at rest, especially with closed eyes.

The sinusoidal nature of alpha waves gives them a smooth and regular appearance, differentiating them from other types of waveforms that may appear on an EEG. The presence of alpha waves can indicate a well-functioning cerebral cortex and is often utilized in clinical assessments to evaluate the state of a patient's brain activity.

Understanding the correct nature of alpha rhythms helps in recognizing their significance in various neurological and psychological contexts, including their role in attentional processes and relaxation.