TY - JOUR
T1 - Intrinsic neural activity differences in psychosis biotypes
T2 - Findings from the Bipolar-Schizophrenia Network on Intermediate Phenotypes (B-SNIP) consortium
AU - Thomas, Olivia
AU - Parker, David
AU - Trotti, Rebekah
AU - McDowell, Jennifer
AU - Gershon, Elliot
AU - Sweeney, John
AU - Keshavan, Matcheri S.
AU - Keedy, Sarah K.
AU - Ivleva, Elena
AU - Tamminga, Carol A.
AU - Pearlson, Godfrey D.
AU - Clementz, Brett A.
N1 - Publisher Copyright:
© 2019 The Authors
PY - 2019/12
Y1 - 2019/12
N2 - Intro: The Bipolar-Schizophrenia Network on Intermediate Phenotypes (B-SNIP) proposed “Biotypes,” subgroups of psychosis cases with neuro-cognitive homology. Neural activity unbound to stimulus processing (nonspecific or intrinsic activity) was important for differentiating Biotypes, with Biotype-2 characterized by high nonspecific neural activity. A precise estimate of intrinsic activity (IA) was not included in the initial Biotypes characterization. This report hypothesizes intrinsic activity is a critical differentiating feature for psychosis Biotypes. Method: Participants were recruited at B-SNIP sites and included probands with psychosis (schizophrenia, schizoaffective disorder, bipolar I disorder), their first-degree biological relatives, and healthy persons (N = 1338). Probands were also sub-grouped by psychosis Biotype. 10-sec inter-stimulus intervals during an auditory paired-stimuli task were used to quantify intrinsic activity from 64 EEG sensors. Single-trial power and connectivity measures at empirically derived frequency bands were quantified. Multivariate discriminant and correlational analyses were used to summarize variables that efficiently and maximally differentiated groups by conventional diagnoses and Biotypes and to determine their relationship to clinical and social functioning. Results: Biotype-1 consistently exhibited low IA, and Biotype 2 exhibited high IA relative to healthy persons across power frequency bands (delta/theta, alpha, beta, gamma) and alpha band connectivity estimates. DSM groups did not differ from healthy persons on any IA measure. Discussion: Psychosis Biotypes, but not DSM syndromes, were differentiated by intrinsic activity; Biotype-2 was uniquely characterized by an accentuation of this measure. Neurobiologically defined psychosis subgroups may facilitate the use of intrinsic activity in translation models aimed at developing effective treatments for psychosis-relevant deviations in neural modulation.
AB - Intro: The Bipolar-Schizophrenia Network on Intermediate Phenotypes (B-SNIP) proposed “Biotypes,” subgroups of psychosis cases with neuro-cognitive homology. Neural activity unbound to stimulus processing (nonspecific or intrinsic activity) was important for differentiating Biotypes, with Biotype-2 characterized by high nonspecific neural activity. A precise estimate of intrinsic activity (IA) was not included in the initial Biotypes characterization. This report hypothesizes intrinsic activity is a critical differentiating feature for psychosis Biotypes. Method: Participants were recruited at B-SNIP sites and included probands with psychosis (schizophrenia, schizoaffective disorder, bipolar I disorder), their first-degree biological relatives, and healthy persons (N = 1338). Probands were also sub-grouped by psychosis Biotype. 10-sec inter-stimulus intervals during an auditory paired-stimuli task were used to quantify intrinsic activity from 64 EEG sensors. Single-trial power and connectivity measures at empirically derived frequency bands were quantified. Multivariate discriminant and correlational analyses were used to summarize variables that efficiently and maximally differentiated groups by conventional diagnoses and Biotypes and to determine their relationship to clinical and social functioning. Results: Biotype-1 consistently exhibited low IA, and Biotype 2 exhibited high IA relative to healthy persons across power frequency bands (delta/theta, alpha, beta, gamma) and alpha band connectivity estimates. DSM groups did not differ from healthy persons on any IA measure. Discussion: Psychosis Biotypes, but not DSM syndromes, were differentiated by intrinsic activity; Biotype-2 was uniquely characterized by an accentuation of this measure. Neurobiologically defined psychosis subgroups may facilitate the use of intrinsic activity in translation models aimed at developing effective treatments for psychosis-relevant deviations in neural modulation.
KW - B-SNIP
KW - Biotypes
KW - Connectivity
KW - DSM
KW - Intrinsic activity
KW - Psychosis
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UR - http://www.scopus.com/inward/citedby.url?scp=85087019757&partnerID=8YFLogxK
U2 - 10.1016/j.bionps.2019.100002
DO - 10.1016/j.bionps.2019.100002
M3 - Article
C2 - 36643612
AN - SCOPUS:85087019757
SN - 2666-1446
VL - 1
JO - Biomarkers in Neuropsychiatry
JF - Biomarkers in Neuropsychiatry
M1 - 100002
ER -