Fig. 2.

Responses to photopically matched short-wavelength (blue) and long-wavelength (red) flashes of high intensity presented at time zero. Trace 1: Response to the blue flash. The flash strength (1.6 × 10⁴ sc td-sec) is representative of that of the blue probe flash used in paired-flash experiments. Trace 2: Response to the photopically matched red flash. Trace 3: Response to the blue flash presented 3 sec after a brilliant conditioning flash (3.4 × 10⁵ sc td-sec). Trace 4: Response to the photopically matched red flash presented 3 sec after the same conditioning flash. Data replotted from Fig. 2 of Pepperberg et al.²⁴, with permission of Cambridge University Press.