Fig. 6

a Four subsequent snapshots of a traveling migraine scotoma drawn by Lashley [32]. The small cross at the left indicates the center of gaze, and the numbers state the time in minutes elapsed before the location of the scotoma was outlined. The point of time when the neurological symptoms were first noticed was chosen as the start. The scotoma travels across the left visual hemifield. b and c Two different neural patterns in V1 that can explain the scotoma in a. Either the noticeable notch in the scotoma pattern along the green path in a is reflected in the neural pattern by a narrow wave width along the neural representation of the green path (b) or the retinotopic map is distorted and the wave width is constant (c). In this case, the green path marks the fundus of the calcarine sulcus