Table 1.

Frequency of [Ca²⁺] oscillations and its relative change in astrocytes after three consecutivet-ACPD applications

	Number of astrocytes	Oscillation frequency mean ± SE I pulse	Change in frequency (%) mean ± SE II pulse	Change in frequency (%) mean ± SE III pulse
CA1	132 (20)	1.55  ± 0.11	+28.4  ± 5.6	+44.7  ± 8.7
CA1 subpopulation	57 (20)	0.66  ± 0.02	+46.2  ± 7.9	+98.8  ± 13.7
Visual cortex	15 (4)	1.05  ± 0.13	+47.4  ± 13.1	+53  ± 7.41
CA1 (3 hr interval)	19 (2)	0.80  ± 0.11	+62.7  ± 13.4	ND

The time interval between stimuli, unless specified, was 10 min. Values in the second and third pulse column indicate the average increase in oscillation frequency in the second and third pulse, respectively, as compared with the oscillation frequency in the first pulse. Numbers in parentheses indicate the number of experiments. ND, Not determined.