Journal
PHYSICAL REVIEW RESEARCH
Volume 2, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevResearch.2.023219
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Funding
- Monash University's Network of Excellence scheme
- Foundational Questions Institute (FQXi) grant on Agency in the Physical World
- Monash University's Science-Medicine Interdisciplinary Research grant
- Overseas JSPS Postdoctoral Fellowship
- Australian Research Council Discovery Project [DP180104128, DP180100396]
- Templeton World Charity Foundation, Inc. [TWCF0199]
- Australian Research Council [FT160100073]
- Australian Research Council [FT160100073] Funding Source: Australian Research Council
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We apply techniques from the field of computational mechanics to evaluate the statistical complexity of neural recording data from fruit flies. First, we connect statistical complexity to the flies' level of conscious arousal, which is manipulated by general anesthesia (isoflurane). We show that the complexity of even single channel time series data decreases under anesthesia. The observed difference in complexity between the two states of conscious arousal increases as higher orders of temporal correlations are taken into account. We then go on to show that, in addition to reducing complexity, anesthesia also modulates the informational structure between the forward- and reverse-time neural signals. Specifically, using three distinct notions of temporal asymmetry we show that anesthesia reduces temporal asymmetry on information-theoretic and information-geometric grounds. In contrast to prior work, our results show that: (1) Complexity differences can emerge at very short timescales and across broad regions of the fly brain, thus heralding the macroscopic state of anesthesia in a previously unforeseen manner, and (2) that general anesthesia also modulates the temporal asymmetry of neural signals. Together, our results demonstrate that anesthetized brains become both less structured and more reversible.
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