Altered temporal scaling of semantic similarity fluctuations in psychosis
Abstract
Scale-free temporal organization, in which fluctuations show similar statistical structures across timescales, is a feature of many complex systems considered to support optimal functioning. Alterations of such scaling have been reported in several pathologies, but whether comparable alterations characterize the temporal organization of language remains largely unexplored. We address this question in the domain of psychosis, where language anomalies are pervasively documented. Specifically, we apply detrended fluctuation analysis (DFA) to quantify temporal scaling in Qwen3-derived continuous cosine similarity time series, capturing trajectories through semantic space computed from transcripts of picture descriptions across three independent datasets. DFA scaling exponents α were extracted to characterize the strength of long-range temporal correlations. Across all datasets, patients exhibited significantly elevated α relative to controls, indicating increased temporal persistence in semantic fluctuations. This analysis opens a window into the multi-timescale organization of meaning as it unfolds in discourse and reveals a signature of altered temporal scaling. This alteration parallels known departures from critical scaling in brain dynamics in psychosis, suggesting the exploration of possible links between these two.
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BibTeX
@misc{ancalmo2026altered,
title = {{Altered temporal scaling of semantic similarity fluctuations in psychosis}},
author = {Paola Moreno Ancalmo and Irem Topal and Emre Bora and Rieke Roxanne Mülfarth and Svenja Seuffert and Tilo Kircher and Frederike Stein and Philipp Homan and Wolfram Hinzen},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.23043},
eprint = {2606.23043},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.23043},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Altered temporal scaling of semantic similarity fluctuations in psychosis
AU - Paola Moreno Ancalmo
AU - Irem Topal
AU - Emre Bora
AU - Rieke Roxanne Mülfarth
AU - Svenja Seuffert
AU - Tilo Kircher
AU - Frederike Stein
AU - Philipp Homan
AU - Wolfram Hinzen
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2606.23043
UR - https://arxiv.org/abs/2606.23043
AB - Scale-free temporal organization, in which fluctuations show similar statistical structures across timescales, is a feature of many complex systems considered to support optimal functioning. Alterations of such scaling have been reported in several pathologies, but whether comparable alterations characterize the temporal organization of language remains largely unexplored. We address this question in the domain of psychosis, where language anomalies are pervasively documented. Specifically, we apply detrended fluctuation analysis (DFA) to quantify temporal scaling in Qwen3-derived continuous cosine similarity time series, capturing trajectories through semantic space computed from transcripts of picture descriptions across three independent datasets. DFA scaling exponents α were extracted to characterize the strength of long-range temporal correlations. Across all datasets, patients exhibited significantly elevated α relative to controls, indicating increased temporal persistence in semantic fluctuations. This analysis opens a window into the multi-timescale organization of meaning as it unfolds in discourse and reveals a signature of altered temporal scaling. This alteration parallels known departures from critical scaling in brain dynamics in psychosis, suggesting the exploration of possible links between these two.
ER -