PT  - JOURNAL ARTICLE
AU  - Ofer Perl
AU  - Or Duek
AU  - Kaustubh R. Kulkarni
AU  - Ben Kelmendi
AU  - Shelley Amen
AU  - Charles Gordon
AU  - John H. Krystal
AU  - Ifat Levy
AU  - Ilan Harpaz-Rotem
AU  - Daniela Schiller
TI  - Neural patterns differentiate traumatic from sad autobiographical memories in PTSD
AID  - 10.1101/2022.07.30.502151
DP  - 2022 Jan 01
TA  - bioRxiv
PG  - 2022.07.30.502151
4099  - http://biorxiv.org/content/early/2022/08/02/2022.07.30.502151.short
4100  - http://biorxiv.org/content/early/2022/08/02/2022.07.30.502151.full
AB  - For people with post-traumatic stress disorder (PTSD), recalling traumatic memories often displays as intrusions that differ profoundly from processing of ‘regular’ negative memories. These mnemonic features fueled theories speculating a qualitative divergence in cognitive state linked with traumatic memories. Yet to date, little empirical evidence supports this view. Here, we examined neural activity of PTSD patients who were listening to narratives depicting their own memories. An inter-subject representational similarity analysis of cross-subject semantic content and neural patterns revealed a differentiation in hippocampal representation by narrative type: Semantically similar sad autobiographical memories elicited similar neural representations across participants. By contrast, within the same individuals, semantically thematically similar trauma memories were not represented similarly. Furthermore, we were able to decode memory type from hippocampal multivoxel patterns. Finally, individual symptom severity modulated semantic representation of the traumatic narratives in the posterior cingulate cortex. Taken together, these findings suggest that traumatic memories are a qualitatively divergent cognitive entity.Competing Interest StatementThe authors have declared no competing interest.