2) A. Grinvald, L. B. Cohen, S. Lesher, and M. B. Boyle: J Neurophysiol 145 (1981) 829.
3) Real-time optical recording of neuronal activities in the brain. M. Ichikawa, T. Iijima, and G. Matsumoto, In: Barin mechanisms of perception and memory (T. Ono, LR. Squire, ME. Raichle, DI. Perrett, M. Fukuda eds), pp 638-648, New York: Oxford UP. (1993).