Table 1 Tuning metrics for LGN neurons

From: Dual parallel stream-specific and generalized effects of corticogeniculate feedback on LGN neurons in primate and carnivore

 

c50 (%)

No LED / with LED

Preferred SF (cycles/deg.)

Preferred TF (Hz)

TF high50 (Hz)

Preferred size, grating (deg.)

SSI

Receptive field size, m-seq. (deg2.)

Parvo neurons (n = 20)

45.7 ± 4

43.3 ± 5

1.1 ± 0.1

1.1 ± 0.1

6.9 ± 0.8

7.3 ± 0.8

19 ± 0.4

19.2 ± 0.4

3.5 ± 0.6

3.8 ± 0.7

0.14 ± 0.04

0.19 ± 0.04

0.7 ± 0.07

0.7 ± 0.08

LED effect:

P-values (paired t-test)

0.59

0.92 (n = 13)

0.19

0.27

0.62 (n = 13)

0.22 (n = 13)

0.56 (n = 17*)

Magno neurons (n = 20)

20.2 ± 3

20.9 ± 4

0.65 ± 0.07

0.82 ± 0.08

15.8 ± 2

15.9 ± 2

23.6 ± 1

23.1 ± 1

3.3 ± 0.6

2.3 ± 0.3

0.55 ± 0.07

0.88 ± 0.06

1.1 ± 0.18

1 ± 0.18

LED effect:

P-values (paired t-test)

0.37 (n = 17)

0.0022 (n = 18)

0.94

0.55

0.0109 (n = 17)

3.5×10-4 (n = 17)

p < 0.01 Wilcoxon

0.0378 (n = 14*)

Konio neurons (n = 8)

35 ± 10

32 ± 9

0.9 ± 0.1

1 ± 0.1

6.5 ± 1.4

6.7 ± 1

18.8 ± 1

18.8 ± 1

2.7 ± 0.5

2.3 ± 0.5

0.42 ± 0.2

0.47 ± 0.2

0.7 ± 0.1

0.8 ± 0.1

LED effect:

P-values (paired t-test)

0.48

0.14

0.92

0.98

0.19 (n = 5)

0.4 (n = 5)

0.37 (n = 6*)

Neuronal type differences (non-parametric ANOVA)

0.0003

Parvo > Magno

0.0009

Parvo > Magno

8.4×10-6

Magno > Parvo & Konio

4.8 × 10−5

Magno > Parvo & Konio

0.5

0.0028

Magno > Parvo

0.0749

  1. Average contrast to evoke a half-maximal response (c50), preferred spatial frequency (SF), preferred temporal frequency (TF), temporal frequency to evoke a half-maximal response greater than the preferred frequency (TF high50), preferred grating size, surround suppression index (SSI), and receptive field size for parvocellular (parvo), magnocellular (magno), and koniocellular (konio) LGN neurons; for each metric, average values without LED at left, with LED at right (LED labels only shown for c50 columns). Some tuning metric averages were computed from a subset of neurons (n’s indicated below p values). Asterisks indicate different subsets of neurons contributing to receptive field size measurements from white noise m-sequence data compared to neurons contributing to grating-based tuning metrics. P-values indicate significant effects of the LED (paired t-tests (two-sided); Wilcoxon signed-rank test noted), using a Bonferroni corrected alpha=0.0125 for contrast, SF and TF metrics and a Bonferroni corrected alpha=0.025 for size metrics. Bottom p-values indicate significant differences across neuronal types (comparisons of no LED responses).
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