Figure 2.
(i) Odorant sequence: Green down arrow indicates the starting of the stimulant presentation and red up arrow indicates ending of the stimulation. (ii) Vacuuming sequence: Green down arrow indicates the starting of the vacuuming to remove odorant and the red up arrow indicates ending of vaccuuming. (iii) Block Design: “0” indicates the absence of an odorant (OFF condition) and “1” indicates the presence of an odorant (ON condition).