Figure 5.

The relations between spindle density increase and generalization. (a) Relation between the increase in central–parietal spindle density and the N400 effect of immediate generalization during the second half of the learning phase (r = 0.444, p = 0.023). Due to the negative potential shift of the N400, the positive sign of the correlation coefficient reflects a negative dependency. (b) Positive relation between the increase in central–parietal spindle density and the negative N400 generalization effect in the memory test (r = −0.568, p = 0.001). (c) Positive relation between the increase in central–parietal spindle density and the increase in the N400 generalization effect from learning to memory test (r = −0.707, p = 0.00005)