Critically, the Memory × Region interaction was also significant (left: F(1,29) = 39.20, p < 0.001; right: F(1,29) = 36.6, p < 0.001), indicating that the effect of Memory significantly differed across regions. We then analyzed each region separately. Of course, there was a significant main effect of Memory in IPL (left: F(1,29) = 47.88, p < 0.001; right: F(1,29) = 34.97, p < 0.001). The main effect of Memory in IPS was not significant (left: F(1,29) = .98, p = .33; right: F(1,29) = 2.56, p = 0.12). The Region × Attention × Memory interaction was not significant

(both hemispheres: F ≤ 1). These analyses indicate that the dissociation between the IPS and the IPL does not depend on the threshold employed in the whole-brain analysis. The interaction between visual attention and episodic retrieval is poorly selleck chemicals llc understood. Given that the neural systems mediating attention and episodic memory appear to be anatomically segregated, and perhaps even in competition, it is unclear which neural systems are engaged Selleckchem DAPT when visual attention is recruited during episodic retrieval.

We investigated the recruitment of visual attention by episodic retrieval during the suppression of gist-based false recognition. When two similar candidate targets were presented next to each other, participants had to systematically compare the two items and attend to the details that distinguished them in order to decide whether one of the items was old (Attention-High conditions). This process was associated with increased activity in regions previously associated with top-down visual attention ( Kastner and Ungerleider, 2000; Corbetta and Tryptophan synthase Shulman, 2002), including the IPS ( Figure 2). These results suggest

that systems for top-down visual attention, although not typically associated with episodic retrieval, can play an important role when retrieval of specific visual details is required. Although activity in the IPS was associated with the attempt to retrieve perceptual detail, it was not associated with successful retrieval of perceptual detail. In contrast, activity in the IPL, and other regions likely overlapping with the default network, was associated with the successful retrieval of perceptual detail from memory ( Figure 4). Thus, the IPS and the IPL make dissociable contributions to the retrieval of perceptual detail. Below, we discuss the implications of these findings for models of the role of the parietal cortex in episodic retrieval and visual attention. When two candidate targets were presented adjacent to one another (Attention-High conditions), participants had to systematically compare the two candidate targets and attend to the details that distinguished them in order to decide which item was old.