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The main effect of valence revealed an overall threat advantage in the data: performance on threatening target trials was more efficient than it was on non-threatening target trials. Performance was also more efficient on the cat target trials than the dog target trials and again decreases in efficiency scaled with increases in display size. Absent trials The analysis of the IE scores revealed that, although the Absent search function was well fit by a linear trend, F(1,23) = 201.16, MSE = 26914, p  search efficiency scores as a function of both condition and display set size in the classification task in Experiment 2. Error bars reflect within-participant SE after variation between participants was removed (after Bakeman and McArthur, 1996 ... In this case, the most striking thing was that the main effect of valence was quite unlike those reported previously, because now the effect was manifest as a threat disadvantage: performance was more efficient on non-threatening target trials than it was on threatening target trials. Subsidiary to this general pattern, the main effect of animal revealed that performance was better on cat target  trials than on dog target trials. Finally the main effect of display size again showed that decreases in efficiency scaled with increases in display size. Discussion The key finding in the detection task is that responses to threatening images were more efficient than were responses to the non-threatening images. Comparing [http://www.selleckchem.com/products/Erlotinib-Hydrochloride.html Erlotinib in vitro] across ?? it clearly is the case that the threat advantage in the detection tasks changed dramatically across the two sets of target images. When more careful controls were undertaken �C as in Experiment 2 �C so that the facial features and general pose of the animals were matched across the threatening and the non-threatening sets, then the size of the threat advantage decreased dramatically. In following the advice of Bakeman (2005), the effect size of each of the main effects of valence in the two detection tasks was computed via the ��G2 statistic. The effect sizes were 0.27, and 0.06, in Experiments 1 and 2, respectively.