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Medial temporal lobe activity can distinguish between old and new stimuli independently of overt behavioral choice.

ABSTRACT: We collected fMRI data and confidence ratings as participants performed a recognition memory task that intermixed recently studied words and new (non-studied) words. We first replicated a typical finding from such studies; namely, increasing activity in medial temporal lobe structures with increasing confidence in the old/new decision. Because there are greater proportions of old items at higher confidence levels, such activity could be related to the confidence ratings or to whether items are old or new. When activity associated with old and new items was analyzed separately, we found that activity in the hippocampus bilaterally, as well as in anterior parahippocampal gyrus, was associated with the actual old/new status of the items rather than to which items participants believed to be old. Accordingly, activity in the medial temporal lobe can be modulated by the old/new status of stimuli and does not always track the behavioral response.

SUBMITTER: Kirwan CB

PROVIDER: S-EPMC2732796 | biostudies-other | 2009 Aug

REPOSITORIES: biostudies-other

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Medial temporal lobe activity can distinguish between old and new stimuli independently of overt behavioral choice.

Kirwan C Brock CB Shrager Yael Y Squire Larry R LR

Proceedings of the National Academy of Sciences of the United States of America 20090817 34

We collected fMRI data and confidence ratings as participants performed a recognition memory task that intermixed recently studied words and new (non-studied) words. We first replicated a typical finding from such studies; namely, increasing activity in medial temporal lobe structures with increasing confidence in the old/new decision. Because there are greater proportions of old items at higher confidence levels, such activity could be related to the confidence ratings or to whether items are o ...[more]

PMID: 19706549

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Project description:ObjectiveTo identity phenotypes of self-reported symptoms of psychopathology and their correlates in patients with temporal lobe epilepsy (TLE).Method96 patients with TLE and 82 controls were administered the Symptom Checklist 90-Revised (SCL-90-R) to characterize emotional-behavioral status. The nine symptom scales of the SCL-90-R were analyzed by unsupervised machine learning techniques to identify latent TLE groups. Identified clusters were contrasted to controls to characterize their association with sociodemographic, clinical epilepsy, neuropsychological, psychiatric, and neuroimaging factors.ResultsTLE patients as a group exhibited significantly higher (abnormal) scores across all SCL-90-R scales compared to controls. However, cluster analysis identified three latent groups: (1) unimpaired with no scale elevations compared to controls (Cluster 1, 42% of TLE patients), (2) mild-to-moderate symptomatology characterized by significant elevations across several SCL-90-R scales compared to controls (Cluster 2, 35% of TLE patients), and (3) marked symptomatology with significant elevations across all scales compared to controls and the other TLE phenotype groups (Cluster 3, 23% of TLE patients). There were significant associations between cluster membership and demographic (education), clinical epilepsy (perceived seizure severity, bitemporal lobe seizure onset), and neuropsychological status (intelligence, memory, executive function), but with minimal structural neuroimaging correlates. Concurrent validity of the behavioral phenotype grouping was demonstrated through association with psychiatric (current and lifetime-to-date DSM IV Axis 1 disorders and current treatment) and quality-of-life variables.SignificanceSymptoms of psychopathology in patients with TLE are characterized by a series of discrete phenotypes with accompanying sociodemographic, cognitive, and clinical correlates. Similar to cognition in TLE, machine learning approaches suggest a developing taxonomy of the comorbidities of epilepsy.

Dataset Information

Medial temporal lobe activity can distinguish between old and new stimuli independently of overt behavioral choice.

Publications

Medial temporal lobe activity can distinguish between old and new stimuli independently of overt behavioral choice.

Similar Datasets

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