Abstract:
:The ventral (VPC) and dorsal sectors of the posterior parietal cortex are long known to mediate bottom-up and top-down attention to the external space. Because these regions also are implicated in retrieval of episodic memories, we proposed they also mediate attention to the internal (memory) space. One objection to this Attention to Memory hypothesis is that parietal regions involved in directing attention to percepts and memory are spatially adjacent but not overlapping, suggesting that different neural mechanisms are involved in each. This misalignment is most pronounced in VPC. Here, we re-examine fMRI data, and show that (1) different VPC subregions are associated with different aspects of bottom-up attention to the external space, (2) only VPC subregions showing invalid cue (but not oddball) effects overlap with those associated with episodic memory retrieval, leading us to conclude that (3) the same regions that signal unexpected percepts also signal unexpected memories. These findings are consistent with the 'overarching view' of VPC as deploying bottom-up attention during both perception and episodic memory retrieval, and suggest that the degree of anatomical convergence across the two domains depends on the correspondence between the specific bottom-up attention demands of perceptual and memory tasks.
journal_name
Neuropsychologiajournal_title
Neuropsychologiaauthors
Ciaramelli E,Moscovitch Mdoi
10.1016/j.neuropsychologia.2020.107551subject
Has Abstractpub_date
2020-09-01 00:00:00pages
107551eissn
0028-3932issn
1873-3514pii
S0028-3932(20)30224-4journal_volume
146pub_type
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