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. 2001 Mar 1;21(5):1532–1537. doi: 10.1523/JNEUROSCI.21-05-01532.2001

Fig. 1.

Fig. 1.

LTP of layer II/III field potentials evoked by stimulation of the white matter in the visual cortex slices obtained from 3- to 5-week-old rats. A, Schematic illustration of visual cortex slice showing stimulating and recording sites.B, Sample records of layer II/III field potentials evoked by test stimulation of the white matter at the times denoted by the numbers in C. Test stimulation was delivered at the times indicated by arrowheads. The amplitude of the negative-going potential was measured as an index of excitatory synaptic transmission. Calibration: vertical, 0.2 mV; horizontal, 5 msec. C, Time course of LTP in the visual cortex slices obtained from rats that were 3 (○), 4 (▵), or 5 (■) weeks old. Tetanic stimulation (100 Hz for 1 sec, twice at an interval of 30 sec) was applied at time 0; the amplitude of excitatory synaptic potential is expressed as a percentage of the baseline value immediately before tetanic stimulation. Data are the means ± SEM (n = 5).