Figure 6: Contrast Change Detection Paradigm.
From: A resource for assessing information processing in the developing brain using EEG and eye tracking

The group average topographies are shown for the sensory evidence signal (represented as SSVEP, a), the response-locked CPP component reflecting evidence accumulation (b), and the decrease of beta frequency (12.5–18 Hz) spectral amplitude over left/right motor cortical areas at response relative to before target onset, reflecting motor preparation (c). Left-tilted and right-tilted targets are collapsed in all cases.