Evoked activity explained
Evoked activity is brain activity that is the result of a task, sensory input or motor output.[1] It is opposed to spontaneous brain activity during the absence of any explicit task.[2]
Most experimental studies in neuroscience investigate brain functioning by administering a task or stimulus and measure the resulting changes in neuronal activity and behavior. In electroencephalography (EEG) research, evoked activity or evoked responses specifically refers to activity that is phase-locked to the stimulus onset and is opposed to induced activity, which is a stimulus-related change in (the amplitude of) oscillatory activity.
See also
Notes and References
- Nierhaus . Till . Schön . Tobias . Becker . Robert . Ritter . Petra . Villringer . Arno . October 2009 . Background and evoked activity and their interaction in the human brain . Magnetic Resonance Imaging . 27 . 8 . 1140–1150 . 10.1016/j.mri.2009.04.001 . 1873-5894 . 19497696 . Sensory stimulation generates electrical potentials in the brain which are termed evoked potentials (when picked up with EEG); the MEG recordings of the magnetic counterparts are termed evoked fields. Amplitudes of EPs/fields are usually too small to be detected in a single trial; therefore, EEG/MEG recordings are time-locked to a task/stimulation and averaged thereafter... In addition to the “evoked potential," sensory stimulation is also accompanied by oscillatory activity that either can be described as evoked or induced oscillations.
- Uddin . Lucina Q. . September 2020 . Bring the Noise: Reconceptualizing Spontaneous Neural Activity . Trends in Cognitive Sciences . 24 . 9 . 734–746 . 10.1016/j.tics.2020.06.003 . 1879-307X . 7429348 . 32600967 . Spontaneous activity refers to the firing of neurons in the absence of sensory input. This non-evoked or stimulus-independent activity represents a fundamental property of nervous systems..