In this model, the interaction of ‘eyes x people’ was the only term that explained significant variation in the proportion of people littering, and the effect of ‘litter’ was now marginally non-significant, probably due to lack of power ( Table 2 ), but the pattern was the same as that seen in Figure 3 .
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Do images of 'watching eyes' induce behaviour that is more pro-social or more normative? A field experiment on littering.
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The sentences
Why then did we find that signs with watching eyes were more effective in larger group sizes in the current experiment? It is possibly significant that the eye signs we used were much larger and more obvious in the current experiment than in previous experiments.