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Questions and Answers
What does asymmetrical refer to in EEG patterns?
What does asymmetrical refer to in EEG patterns?
- A change in appearance of a rhythm on one side (correct)
- Patterns that occur at regular time intervals
- Equal activity across both hemispheres
- Patterns that are uninterrupted
Which term describes a waveform that occurs at regular intervals of time?
Which term describes a waveform that occurs at regular intervals of time?
- Reactivity
- Periodic (correct)
- Discontinuous
- Intermittent
How is unilateral activity defined in the context of EEG recordings?
How is unilateral activity defined in the context of EEG recordings?
- Activity that is focused in one hemisphere only (correct)
- Random activity without distinct patterns
- Patterns that occur equally over left and right hemispheres
- Activity that involves both hemispheres simultaneously
What is the definition of reactivity in EEG patterns?
What is the definition of reactivity in EEG patterns?
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What characterizes multifocal spike discharges?
What characterizes multifocal spike discharges?
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Which term indicates patterns that occur occasionally and are not synchronized?
Which term indicates patterns that occur occasionally and are not synchronized?
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Study Notes
Symmetry and Asymmetry
- Symmetry refers to the uniformity of patterns or rhythms on both hemispheres of the brain.
- Symmetry can relate to frequency (how often a wave occurs) and amplitude (height of the wave).
- Asymmetrical activity shows a variance in rhythm appearance on one side, often due to added or suppressed brain activity on that side.
Key Terms in Wave Characteristics
- Periodicity: Describes the regular time intervals between occurrences of waves or patterns; periodic waveforms demonstrate consistent timing.
- Reactivity: Identifies patterns that change with specific stimuli, such as eye opening, which can lead to attenuation of alpha waves in occipital leads.
Wave Presence and Distribution
- Continuous: Waves are present without any interruptions throughout the recording.
- Discontinuous: Waves occur at intervals but are not consistent or constant; interrupted patterns are observed.
- Intermittent: Waves appear sporadically and do not follow a defined periodic pattern.
Lateralization in EEG
- Lateralized: Activities or patterns present exclusively in one hemisphere of the brain.
- Bilateral: Activities evident in both hemispheres of the brain during EEG readings.
- Unilateral: Activities confined to one hemisphere, indicating localized effects.
Contralateral and Ipsilateral Activity
- Contralateral: Refers to activities or symptoms affecting the opposite side of the body or head in relation to brain activities.
- Ipsilateral: Activities occurring on the same side as the source of stimulation or effect.
Focal, Multifocal, and Generalized Activity
- Focal: Activity concentrated in a specific, clearly defined brain area, such as temporal spikes or slowing.
- Multifocal: Involves multiple independent focal activities, such as multifocal paroxysmal spike discharges.
- Generalized: Spread of activity across all electrodes, can be:
- Primarily generalized: Discharges that are generalized from the start.
- Secondarily generalized: Discharges that begin as focal and subsequently expand to a generalized state.
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