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The P3b has been a prominent tool used to study cognitive processes, especially psychology research on information processing. Generally speaking, improbable events will elicit a P3b, and the less probable the event, the larger the P3b amplitude. [10] This was shown to be true both for the overall probability and for the local probability. [2]
Assuming that a cephalic reference is used (i.e., a reference electrode placed somewhere on the head, such as the tip of the nose or the chin), the P3b is a positive-going ERP whose latency at peak amplitude is usually about 300 ms to simple sensory stimuli. [5]
Low-amplitude beta waves with multiple and varying frequencies are often associated with active, busy or anxious thinking and active concentration. [ 4 ] Over the motor cortex , beta waves are associated with the muscle contractions that happen in isotonic movements and are suppressed prior to and during movement changes, [ 5 ] with similar ...
There are many kinds, generally written as A-B coupling, meaning the A of a slow wave is coupled with the B of a fast wave. For example, phase–amplitude coupling is where the phase of a slow wave is coupled with the amplitude of a fast wave. [70] The theta-gamma code is a coupling between theta wave and gamma wave in the hippocampal network ...
N2pc amplitude is sensitive to factors related to increasing demands on focused attention. When non-target stimuli closely resemble the target (e.g., when targets are defined by size, but the size difference between targets and distractors is very small), they elicit an N2pc of lower amplitude than a target stimulus [ 3 ] [ 6 ]
The N400 amplitude seen to the target word (honey) will be reduced upon repetition due to semantic priming. [1] The amount of reduction in amplitude can be used to measure the degree of relatedness between the words. Another widely used experimental task used to study the N400 is sentence reading. In this kind of study, sentences are presented ...
Peak-to-peak amplitude (abbreviated p–p or PtP or PtoP) is the change between peak (highest amplitude value) and trough (lowest amplitude value, which can be negative). With appropriate circuitry, peak-to-peak amplitudes of electric oscillations can be measured by meters or by viewing the waveform on an oscilloscope .
The amplitude, or the size, of the N1 is measured by taking the average voltage within the window that typically encompasses the N1 (about 150 to 200 ms post-stimulus).). Because the N1 is a negative-going component, "larger" amplitudes correspond to being more negative, whereas "smaller" amplitudes correspond to being less nega