Lambda Waves - Visual Scanning Occipital Transients

A 22-year-old medical student undergoes an EEG recording during a visual processing research study. While reading a page of complex text with eyes open in a well-lit room, the technician observes sharp, diphasic transients (predominantly positive with a small preceding negative component) over the occipital electrodes (O1, O2, Oz), each time-locked to saccadic eye movements on the simultaneous EOG channel. The amplitude is 30–50 microvolts and duration 150–200 ms. The structure marked **C** in the diagram represents this finding. Which of the following statements best characterizes the physiologic basis and clinical significance of the transient marked **C**?