Abstract: In the present study, three different attention experimental paradigms (without cue, with the endogenous cue, and with the exogenous cue) were used to investigate the SNARC (Spatial Numerical Association of Response Codes) effect of numbers in different notations in attended or unattended conditions. The stimuli were Chinese numbers and Arabic numbers in magnitudes from 1 to 9. Subjects’ task was to decide whether the number was odd or even. The results showed that: a) The SNARC effect appeared in the attended condition without any cue, but it did not appear in the unattended condition. Moreover, the influence of unattended condition on number SNARC effect was mainly found in the larger numbers (8, 9); and b) the same results were also found in the conditions with the endogenous cue or with the exogenous cue, and moreover, the exogenous cue had more influence than endogenous cue and Chinese numbers were more influenced than Arabic numbers.

Key words: attention, endogenous attention, exogenous attention, number processing, SNARC effect