Fig. 2: Above row: a schematic pattern of propagation of spreading depression in human brain.
Lower row: Traces recorded from human tissues. Vertical propagation of spreading depression
reveals a very slow velocity of DC-negative deflection.
Fig. 1. Propagation of a negative DC-potential wave after injection of KCl in a neocortical
slice. Injection of KCl solution (3 M) via a microelectrode elicited spreading depression-like
fluctuation during superfusion with artificial cerebrospinal fluid. Injecting and recording
electrodes arranged as shown. Voltage variations were recorded simultaneously by four
electrodes (DC1–DC4) which set apart by 1 mm.
There is no source given for this chart. On the precious page one finds at the end of the paragraph: "(Fig. 2; Gorji, 2001)", which could be interpreted as a reference of the figure. However, in Gorji (2001) the figure cannot be found.