Table 1.
Attentional performance of non-smokers and smokers
| Parameter | Non-smokers | Smokers | |
|---|---|---|---|
| Placebo | Nicotine | ||
| M (SD) | M (SD) | M (SD) | |
| t 0 | 15 (8) | 12 (8) | 10 (9) |
| C | 70 (24) | 55 (23) | 51 (18) |
| K | 3.30 (0.50) | 3.20 (0.60) | 3.20 (0.70) |
| α | 0.53 (0.26) | 0.64 (0.37) | 0.68 (0.27) |
| w index | 0.47 (0.08) | 0.50 (0.08) | 0.49 (0.09) |
| Error rate | 0.18 (0.05) | 0.20 (0.07) | 0.24 (0.09) |
Units for the individual parameters are t 0 (ms), C (letters/second), K (letters), α ranges from perfect selection at 0 to non-selectivity at 1, w index ranges from complete rightward bias at 0 to complete leftward bias at 1 with 0.5 indicating equal weighting between the two visual fields