Table 3.
Means (SD in parenthesis) and results of one sample t-tests against zero for SNARC and ordinal position effects (error rates in %) for different sequence lengths, number ranges, and positions in the memorized sequence or number magnitude, respectively.
| Number range | Sequence length | Position | M (SD) | t | p |
|---|---|---|---|---|---|
| SNARC effect | |||||
| 1–9 | 4 | Initial | –0.89% (2.91%) | –1.79 | 0.082 |
| Last | –0.74% (3.97%) | –1.08 | 0.288 | ||
| 5 | Initial | –0.76% (2.89%) | –1.53 | 0.135 | |
| Last | –0.89% (2.46%) | –2.12 | 0.041 | ||
| 6 | Initial | –1.58% (2.63%) | –3.50 | 0.001 | |
| Last | –0.70% (2.37%) | –1.73 | 0.093 | ||
| 1–10 | 4 | Initial | –1.32% (2.24%) | –3.44 | 0.002 |
| Last | –0.31% (2.41%) | –0.74 | 0.463 | ||
| 5 | Initial | –0.12% (1.99%) | –0.37 | 0.717 | |
| Last | –0.43% (2.77%) | –0.90 | 0.374 | ||
| 6 | Initial | –0.97% (2.31%) | –2.44 | 0.020 | |
| Last | –0.97% (3.08%) | –1.83 | 0.077 | ||
| Ordinal position effect | |||||
| 1–9 | 4 | Small | –3.38% (6.05%) | –3.26 | 0.003 |
| Large | –2.61% (8.19%) | –1.86 | 0.072 | ||
| 5 | Small | –1.65% (4.16%) | –2.32 | 0.027 | |
| Large | –2.72% (4.15%) | –3.83 | <0.001 | ||
| 6 | Small | –0.64% (4.22%) | –0.89 | 0.382 | |
| Large | –0.14% (4.17%) | –0.19 | 0.850 | ||
| 1–10 | 4 | Small | –3.27% (5.76%) | –3.31 | 0.002 |
| Large | –0.83% (6.04%) | –0.80 | 0.427 | ||
| 5 | Small | –0.81% (6.56%) | –0.72 | 0.477 | |
| Large | –0.81% (3.70%) | –1.27 | 0.211 | ||
| 6 | Small | –1.14% (3.82%) | –1.75 | 0.090 | |
| Large | –0.64% (2.81%) | –1.32 | 0.195 |
SNARC/ordinal position effect slopes were computed for dRT = RT right hand – RT left hand. Thus, negative slopes indicate faster responses for small numbers/initial elements with left hand and faster responses for large numbers/last elements with right hand.