Table 2.
Fixation parameters of far-to-near refixation saccades
| Far Fixation |
Near Fixation |
||||||||
|---|---|---|---|---|---|---|---|---|---|
| Variability of eccentricity ×10−4 |
|||||||||
| Subjects Session | Trials (n) | Vergence angle, ° | Target shell Ra, ° | Target shell Rb, ° | Vergence angle, ° | Target shell Ra, ° | Target shell Rb, ° | Right | Left |
| M1 | |||||||||
| 48* | 5 of 11 | 1.6 (0.2) | 0.3 (0.03) | 0.2 (0.1) | 15.8 (0.4) | 14.9 (0.5) | 10.4 (0.5) | 0.8 (0.5) | 2.6 (1.0) |
| 49 | 25 | 1.8 (0.3) | 0.2 (0.04) | 0.3 (0.1) | 15.3 (0.9) | 11.7 (0.7) | 12.1 (0.6) | 0.3 (0.3) | 1.1 (1.1) |
| 68 | 7 | 3.4 (2.5) | 0.7 (0.3) | 2.6 (2.2) | 19.5 (0.1) | 14.0 (0.2) | 14.8 (0.7) | 0.4 (0.2) | 0.8 (0.6) |
| 70 | 26 | 1.8 (0.5) | 1.8 (0.1) | 2.3 (0.1) | 18.5 (0.4) | 13.6 (0.7) | 14.3 (0.9) | 0.3 (0.3) | 1.7 (1.0) |
| M2 | |||||||||
| 41* | 26 of 47 | 2.0 (0.4) | 2.0 (0.2) | 1.9 (0.2) | 11.2 (1.4) | 14.3 (0.7) | 9.2 (0.7) | 0.6 (0.5) | 0.5 (0.5) |
| 43 | 27 | 1.3 (0.7) | 1.0 (0.2) | 1.0 (0.2) | 14.8 (1.6) | 11.7 (0.7) | 9.3 (1.2) | 1.0 (0.5) | 0.5 (0.4) |
| 44* | 36 of 42 | 2.2 (0.6) | 0.9 (0.2) | 1.0 (0.2) | 14.9 (1.5) | 17.4 (0.6) | 14.8 (1.0) | 4.3 (2.5) | 1.2 (0.8) |
| 45 | 25 | 1.1 (0.4) | 0.8 (0.2) | 0.8 (0.2) | 14.4 (0.9) | 11.6 (0.7) | 14.9 (0.8) | 4.3 (1.4) | 0.7 (0.6) |
| 47 | 17 | 1.5 (0.4) | 1.7 (0.1) | 1.7 (0.1) | 16.5 (0.7) | 13.4 (0.3) | 13.4 (0.7) | 6.3 (2.7) | 3.4 (1.4) |
| 48 | 25 | 1.5 (0.5) | 1.5 (0.2) | 1.7 (0.2) | 16.3 (0.8) | 13.2 (0.8) | 13.3 (0.8) | 5.4 (2.4) | 2.7 (1.8) |
| 52 | 73 | 1.6 (0.3) | 1.3 (0.2) | 1.3 (0.2) | 15.9 (0.9) | 15.5 (0.9) | 13.8 (0.7) | 6.0 (2.4) | 3.0 (1.6) |
| M2** | |||||||||
| 57 | 14 | 1.4 (0.5) | 1.2 (0.2) | 1.2 (0.2) | 16.7 (0.5) | 14.3 (0.5) | 13.2 (1.1) | 1.0 (0.8) | 3.6 (1.3) |
| 59* | 6 of 10 | 1.5 (0.6) | 1.1 (0.1) | 1.2 (0.1) | 15.8 (0.2) | 13.5 (0.8) | 12.6 (0.7) | 1.4 (1.0) | 4.0 (1.6) |
| M3 | |||||||||
| 42 | 19 | 1.5 (0.7) | 0.8 (0.05) | 0.8 (0.5) | 12.8 (2.3) | 12.4 (1.0) | 11.4 (1.5) | 1.2 (1.0) | 0.8 (0.8) |
Values are means (SD). The variability of the near-fixation point eccentricity was determined by computing the ratio ρ = |RDL − RF| /RF where RDL and RF are, respectively, the radii of the iso-eccentricity circles of Donders-Listing (DL) positions and fixation points.
*
In the these sessions, only part of the fixations fulfilled the fusion criteria as indicated.
**
Trials with near target 10° above horizontal plane of regard.