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Fractionating the neural substrates of incidental recognition memory
Ciara M Greene1, Kleio Vidaki2, David Soto2
1University College Dublin, School of Psychology, Dublin 2, Ireland Imperial College London, Department of Medicine, Division of Brain Sciences, London W6 8RP, United Kingdom ciara.greene@ucd.ie.
Learning & Memory (Cold Spring Harbor, N.Y.)
|December 17, 2014
Summary
Familiar stimuli reduce brain activity in the inferior frontal gyrus and hippocampus, even without explicit memory tasks. This suggests distinct neural pathways for familiarity processing separate from recognition goals.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Cognitive Neuroscience
Background:
- Neural responses typically decrease with familiar stimuli compared to novel ones.
- Previous studies often used explicit memory tasks, confounding results with top-down attention.
Purpose of the Study:
- To investigate neural responses to familiar and novel stimuli without explicit memory demands.
- To determine if recognition memory substrates are separable even without active memory goals.
Main Methods:
- Utilized an incidental recognition functional MRI (fMRI) paradigm.
- Compared brain responses to repeated novel and familiar stimuli under conditions minimizing intentional orientation.
Main Results:
- The inferior frontal gyrus and hippocampus showed increased activity for novelty and decreased activity for familiarity.
- Functional connectivity analysis revealed a network involving the hippocampus and prefrontal cortex in familiarity processing.
Conclusions:
- Recognition memory involves distinct neural substrates that can be identified independently of explicit memory goals.
- Familiarity processing engages a network including the hippocampus and prefrontal cortex, even incidentally.
