Table 1.

Comparison of properties of synaptic connections established by L4 spiny neuron nerve terminals projecting onto other excitatory neurons in different cortical layers

L4 projection to: L4 spiny stellate L2/3 pyramidal cells L5A pyramidal cells
Unitary EPSP (mV) 1.6 ± 1.5 (n = 131) 0.7 ± 0.6 (n = 64) 0.6 ± 0.4 (n = 12)
Coefficient of variation 0.37 ± 0.18 (n = 131) 0.27 ± 0.13 (n = 63) 0.33 ± 0.20 (n = 12)
Paired-pulse ratio (100 ms interstimulus interval) 0.73 ± 0.25 (n = 8) 0.87 ± 0.31 (n = 7) 0.83 ± 0.08 (n = 4)
Connectivity 0.2−0.3 0.1 0.1
  • This table includes data from Feldmeyer et al. (1999,2002).