Electrophysiological correlates of semantic memory retrieval in Gulf War Syndrome 2 patients.

Abstract:

:Gulf War veterans meeting criteria for Haley Syndrome 2 of Gulf War illness endorse a particular constellation of symptoms that include difficulty with processing information, word-finding, and confusion. To explore the neural basis of their word-finding difficulty, we assessed event-related potentials (ERPs) associated with semantic memory retrieval in 22 veterans classified as Syndrome 2 and 28 veterans who served as controls. We recorded EEGs while subjects judged whether pairs of words that represented object features combined to elicit a retrieval of an object memory or no retrieval. Syndrome 2 subjects' responses were significantly slower, and those participants were less accurate than controls on the retrieval trials, but they performed similarly on the nonretrieval trials. Analysis of the ERPs revealed a difference between retrievals and nonretrievals that has previously been detected around 750ms at the left temporal region was present in both the Syndrome 2 patients and controls. However, the Syndrome 2 patients also showed an ERP difference between retrievals and nonretrievals at the midline parietal region that had a scalp voltage polarity opposite from that recorded at the left temporal area. We hypothesize that the similarities between task performance and ERP patterns in Syndrome 2 veterans and in patients with amnestic mild cognitive impairment reflect disordered thalamic cholinergic neural activity, possibly in the dorsomedial nucleus.

journal_name

J Neurol Sci

authors

Tillman GD,Calley CS,Buhl VI,Chiang HS,Haley RW,Hart J Jr,Kraut MA

doi

10.1016/j.jns.2016.12.023

subject

Has Abstract

pub_date

2017-02-15 00:00:00

pages

66-72

eissn

0022-510X

issn

1878-5883

pii

S0022-510X(16)30816-4

journal_volume

373

pub_type

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