title: Detecting changes in scenes: the hippocampus is critical for strength-based perception.
abstract: Recent findings have ignited a controversy over whether the hippocampus is critical for visual perception as well as memory. Some studies have shown that hippocampal damage impairs perception of scenes, but others found no evidence for hippocampal involvement. These studies measured perception as a unitary phenomenon, but recent findings indicate that perceptual discriminations can be based on two kinds of information: states of perceiving local differences or global strength of relational match. In the current study, we separated state- and strength-based perception using a change detection paradigm with scenes. Patients with selective hippocampal damage exhibited significant reductions in strength-based perception but showed spared state-based responses. In a follow-up neuroimaging study, hippocampal activation linearly tracked confidence in strength-based perception, and was not differentially associated with state-based responses. The hippocampus therefore plays a selective role in perception, contributing high-resolution strength information possibly through its role in the representation of relational information.
authors.affiliation: Department of Psychology, University of California, Davis, 135 Young Hall, One Shields Avenue, Davis, CA 95616, USA. mariam.s.aly@gmail.com
authors.forename: Mariam
authors.initials: M
authors.lastname: Aly
authors.forename: Charan
authors.initials: C
authors.lastname: Ranganath
authors.forename: Andrew P
authors.initials: AP
authors.lastname: Yonelinas
mesh_terms: D000328:Adult; D005260:Female; D005500:Follow-Up Studies; D006624:Hippocampus / Q000473:pathology* / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010775:Photic Stimulation / Q000379:methods*; D011930:Reaction Time / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult