Figure 3.

Blinking increases as rats approach the eyeblink stimulus positions. A, C, Stimuli were delivered at 0 cm on the x-axis (gray vertical bar). A modest increase in blinking as rats run toward the stimuli is evident during days 1–10 at both Position 1 (A) and Position 2 B, D, Blinking increases to a higher level during days 21–30 near both positions (B, D). There were no significant differences in blinking levels between age groups, but a significant effect of distance from stimulus location in all plots (see Statistical analyses, Materials and Methods). Days 1–10: Young, n = 11; Old, n = 10. Days 21–30: Young, n = 9; Old, n = 9. Data shown in this and subsequent figures are mean ± SEM.