TABLE 1.
Probability of tightly correlated firing for different cell-type combinations
| Property | YA–YC | YC–YC | YA–YA | XA–XA | XA–YA | XA–YC |
|---|---|---|---|---|---|---|
| A. All cell pairs | ||||||
| Correlation probability | ||||||
| ≥20% RF overlap | 22% (69) | 49% (35) | 22% (18) | 19% (103) | 12% (50) | 3% (67) |
| ≥40% RF overlap | 31% (49) | 63% (27) | 29% (14) | 22% (89) | 14% (42) | 3% (60) |
| ≥80% RF overlap | 59% (22) | 64% (11) | 40% (5) | 37% (38) | 13% (16) | 6% (34) |
| B. Cell pairs with same-sign RFs | ||||||
| Correlation probability | ||||||
| ≥20% RF overlap, same sign | 36% (42) | 74% (23) | 40% (10) | 31% (61) | 21% (29) | 7% (29) |
| ≥40% RF overlap same sign | 52% (29) | 85% (20) | 50% (8) | 35% (55) | 23% (26) | 7% (28) |
| ≥80% RF overlap same sign | 93% (14) | 88% (8) | 67% (3) | 57% (23) | 22% (9) | 13% (16) |
| C. Average RF properties of tightly correlated cells pairs | ||||||
| Receptive-field overlap | ||||||
| Mean ± SD | 89.5 ± 11.1% | 74.1 ± 17.1% | 76.3 ± 20.6% | 84.7 ± 20.3% | 79.5 ± 16.8 | 95.0 ± 7.1% |
| Receptive-field size ratio | ||||||
| Mean ± SD | 1.7 ± 0.9 | 1.7 ± 0.8 | 1.3 ± 0.5 | 1.3 ± 0.3 | 1.6 ± 0.3 | 1.5 ± 0.3 |
| Peak-time difference, ms | ||||||
| Mean ± SD | 2.1 ± 1.6 | 0.6 ± 0.8 | 0.4 ± 0.8 | 1.6 ± 1.9 | 7.0 ± 3.2 | 3.1 ± 2.2 |
The probabilities were calculated for cells with different receptive field (RF) overlap, either including all pairs or selecting only cell pairs with receptive fields of the same sign. The bottom three rows of the table provide average values for receptive-field overlap, receptive-field size ratio, and peak-time difference. The numbers in parentheses represent the sample sizes.