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| | [[File:emotionalfrog.jpg]] | | [[File:emotionalfrog.jpg]] |
| | [[File:reflection.png]] | | [[File:reflection.png]] |
| − | Band Frequency (Hz) Location Normally Pathologically
| + | [[File:Spike-waves.png]] |
| − | Delta
| + | [[File:EEG.jpg]] |
| − | < 4 frontally in adults, posteriorly in children; high-amplitude waves • adult slow-wave sleep
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| − | • in babies
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| − | • Has been found during some continuous-attention tasks[46] • subcortical lesions
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| − | • diffuse lesions
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| − | • metabolic encephalopathy hydrocephalus
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| − | • deep midline lesions
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| − | Theta
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| − | 4 – 7 Found in locations not related to task at hand • higher in young children
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| − | • drowsiness in adults and teens
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| − | • idling
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| − | • Associated with inhibition of elicited responses (has been found to spike in situations
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| − | where a person is actively trying to repress a response or action).[46] • focal subcortical lesions
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| − | • metabolic encephalopathy
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| − | • deep midline disorders
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| − | • some instances of hydrocephalus
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| − | Alpha
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| − | 8 – 15 posterior regions of head, both sides, higher in amplitude on dominant side. Central sites (c3-c4) at rest • relaxed/reflecting
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| − | • closing the eyes
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| − | • Also associated with inhibition control, seemingly with the purpose of timing inhibitory activity in different locations across the brain. • coma
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| − | Beta
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| − | 16 – 31 both sides, symmetrical distribution, most evident frontally; low-amplitude waves • range span: active calm -> intense -> stressed -> mild obsessive
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| − | • active thinking, focus, hi alert, anxious • benzodiazepines
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| − | Gamma
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| − | 32 + Somatosensory cortex • Displays during cross-modal sensory processing (perception that combines two different senses, such as sound and sight)[47][48]
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| − | • Also is shown during short-term memory matching of recognized objects, sounds, or tactile sensations • A decrease in gamma-band activity may be associated with cognitive decline, especially when related to the theta band; however, this has not been proven for use as a clinical diagnostic measurement
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| − | Mu
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| − | 8 – 12 Sensorimotor cortex • Shows rest-state motor neurons.[49] • Mu suppression could indicate that motor mirror neurons are working. Deficits in Mu suppression, and thus in mirror neurons, might play a role in autism.[50]
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| − | Comparison of EEG bands
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File:EEG.jpg
