Table 1.
Temporal and spectral modulation transfer function parameters for regular-spiking and fast-spiking neurons
| Layer | bTMF, cycles/s | tMTF BW, cycles/s | bSMF, cycles/octave | sMTF BW, cycles/octave | ||||
|---|---|---|---|---|---|---|---|---|
| A. Regular-spiking neurons | ||||||||
| II/III | 10.96 (5.11) | 18.65 (9.72) | 0.98 (0.50) | 1.88 (0.98) | ||||
| IV | 13.37 (5.95) | 21.26 (8.55) | 0.88 (0.43) | 1.67 (0.88) | ||||
| V | 12.50 (5.39) | 21.85 (9.11) | 0.98 (0.51) | 1.93 (0.99) | ||||
| VI | 11.77 (4.52) | 22.45 (9.66) | 0.99 (0.50) | 1.94 (1.03) | ||||
| B. Fast-spiking neurons | ||||||||
| II/III | 12.36 (4.81) | 21.49 (10.13) | 1.02 (0.35) | 2.08 (0.73) | ||||
| IV | 13.35 (5.29) | 19.90 (9.01) | 0.86 (0.38) | 1.55 (0.75) | ||||
| V | 14.78 (7.82) | 24.16 (12.97) | 0.77 (0.50) | 1.66 (1.14) | ||||
| VI | 15.71 (7.01) | 25.78 (10.26) | 0.85 (0.65) | 1.74 (1.29) | ||||
Mean best modulation frequency or bandwidth in each layer is shown (SD in parentheses). For regular-spiking neurons (n = 592), best TMF was significantly different between layer IV and layer II/III. Layer II/III tMTF bandwidths were narrower than those in layers V and VI. Spectral MTF parameters were not significantly different between layers. For fast-spiking neurons (n = 104), layer differences were not statistically different. Layer-by-layer differences between regular- and fast-spiking neurons were not significant. [Significance was determined from t-tests (regular-spiking) or Kolmogorov–Smirnov tests (fast-spiking, P < 0.05, with Bonferroni correction.]