Fig. 5.

Spatial distribution of synaptic inputs onto layer IV spiny neurons. a, Percentages of stimulated presynaptic fields delivering intracolumnar and transcolumnar excitatory synaptic inputs onto layer IV spiny stellate cells (black bars, n = 11) and pyramidal neurons (shaded bars, n = 8).b, Mean strength of excitatory intracolumnar and transcolumnar synaptic inputs. c, Percentages of stimulated presynaptic fields delivering inhibitory synaptic inputs. Note that in a and c scales for transcolumnar inputs are enlarged. Data are means ± SD.Asterisks indicate significant differences between the two cell groups: *p < 0.05 and **p < 0.01.