Figure 1. Analyses of Individual response functions in two previous studies indicate inconclusive results relative to the scalar property in house mice.

In a manner comparable with our study, for each subject we estimated the η² index of superposition. A. King et al. (2001) tested only two mice, of which only one shows η² larger than 0.8. B. Gallistel et al. tested 6 mice, of which only 2 approach η² larger than 0.8 for all three durations, with the other four mice showing η² lower than 0.5. Together, only 3 out of 8 mice show high superposition indices for the tested durations.