Y task, they had to remember the pictures for a later

They also heard a voice say "You will be [memorizing/256376-24-6 biological activity searching]. In half the participant was told to memorize the stimuli and in half to search for an X. Participants' own task was crossed with the task they were told their partner was doing. Half the time they were told that their partner performed the same task, and half a different task. On eight trials (spread evenly across conditions), an X appeared at a random location on one of the images.Participants showed a robust preference for negative images over positive images only when they believed that they and their partner had been assigned the same task. We calculated the total amount of time spent looking at the critical negative and positive images on trials where there was no X (we did not analyse the 20 of trials when there was an X present, as X and participants' responses to it would interfere with how they allocated their attention to each image). A 2 (valence) ?2 (own task: memory/search) ?2 (other's task: same/different) ANOVA was performed, and the means for each cell are displayed in Figure 3. There was a significant two way interaction between valence and other's task [F(1, 27) = 10.08, p = 0.004, 2 = 0.41]. Post hoc tests show that the difference between positive and negative images was significant when the participants believed they were doing the same task (Tukey's HSD p = 0.01), but did not reach significance when they were doing a different task. There was also a main effect of valence [F(1, 27) = 19.19, p = 0.0001, 2 = 0.27], but all other main effects and interactions were non significant (all Fs