1
|
Bullock T, MacLean MH, Santander T, Boone AP, Babenko V, Dundon NM, Stuber A, Jimmons L, Raymer J, Okafor GN, Miller MB, Giesbrecht B, Grafton ST. Habituation of the stress response multiplex to repeated cold pressor exposure. Front Physiol 2023; 13:752900. [PMID: 36703933 PMCID: PMC9871365 DOI: 10.3389/fphys.2022.752900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 11/21/2022] [Indexed: 01/12/2023] Open
Abstract
Humans show remarkable habituation to aversive events as reflected by changes of both subjective report and objective measures of stress. Although much experimental human research focuses on the effects of stress, relatively little is known about the cascade of physiological and neural responses that contribute to stress habituation. The cold pressor test (CPT) is a common method for inducing acute stress in human participants in the laboratory; however, there are gaps in our understanding of the global state changes resulting from this stress-induction technique and how these responses change over multiple exposures. Here, we measure the stress response to repeated CPT exposures using an extensive suite of physiologic measures and state-of-the-art analysis techniques. In two separate sessions on different days, participants underwent five 90 s CPT exposures of both feet and five warm water control exposures, while electrocardiography (ECG), impedance cardiography, continuous blood pressure, pupillometry, scalp electroencephalography (EEG), salivary cortisol and self-reported pain assessments were recorded. A diverse array of adaptive responses are reported that vary in their temporal dynamics within each exposure as well as habituation across repeated exposures. During cold-water exposure there was a cascade of changes across several cardiovascular measures (elevated heart rate (HR), cardiac output (CO) and Mean Arterial Pressure (MAP) and reduced left ventricular ejection time (LVET), stroke volume (SV) and high-frequency heart rate variability (HF)). Increased pupil dilation was observed, as was increased power in low-frequency bands (delta and theta) across frontal EEG electrode sites. Several cardiovascular measures also habituated over repeated cold-water exposures (HR, MAP, CO, SV, LVET) as did pupil dilation and alpha frequency activity across the scalp. Anticipation of cold water induced stress effects in the time-period immediately prior to exposure, indexed by increased pupil size and cortical disinhibition in the alpha and beta frequency bands across central scalp sites. These results provide comprehensive insight into the evolution of a diverse array of stress responses to an acute noxious stressor, and how these responses adaptively contribute to stress habituation.
Collapse
Affiliation(s)
- Tom Bullock
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States,*Correspondence: Tom Bullock,
| | - Mary H. MacLean
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Tyler Santander
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Alexander P. Boone
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Viktoriya Babenko
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Neil M. Dundon
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States,Department of Child and Adolescent Psychiatry, Psychotherapy and Psychosomatics, University of Freiburg, Freiburg im Breisgau, Germany
| | - Alexander Stuber
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Liann Jimmons
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Jamie Raymer
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Gold N. Okafor
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Michael B. Miller
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Barry Giesbrecht
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| | - Scott T. Grafton
- Department of Psychological and Brain Sciences, University of California, Santa Barbara, Santa Barbara, CA, United States,Institute for Collaborative Biotechnologies, University of California, Santa Barbara, Santa Barbara, CA, United States
| |
Collapse
|
3
|
Better living through understanding the insula: Why subregions can make all the difference. Neuropharmacology 2021; 198:108765. [PMID: 34461066 DOI: 10.1016/j.neuropharm.2021.108765] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 07/19/2021] [Accepted: 08/23/2021] [Indexed: 02/07/2023]
Abstract
Insula function is considered critical for many motivated behaviors, with proposed functions ranging from attention, behavioral control, emotional regulation, goal-directed and aversion-resistant responding. Further, the insula is implicated in many neuropsychiatric conditions including substance abuse. More recently, multiple insula subregions have been distinguished based on anatomy, connectivity, and functional contributions. Generally, posterior insula is thought to encode more somatosensory inputs, which integrate with limbic/emotional information in middle insula, that in turn integrate with cognitive processes in anterior insula. Together, these regions provide rapid interoceptive information about the current or predicted situation, facilitating autonomic recruitment and quick, flexible action. Here, we seek to create a robust foundation from which to understand potential subregion differences, and provide direction for future studies. We address subregion differences across humans and rodents, so that the latter's mechanistic interventions can best mesh with clinical relevance of human conditions. We first consider the insula's suggested roles in humans, then compare subregional studies, and finally describe rodent work. One primary goal is to encourage precision in describing insula subregions, since imprecision (e.g. including both posterior and anterior studies when describing insula work) does a disservice to a larger understanding of insula contributions. Additionally, we note that specific task details can greatly impact recruitment of various subregions, requiring care and nuance in design and interpretation of studies. Nonetheless, the central ethological importance of the insula makes continued research to uncover mechanistic, mood, and behavioral contributions of paramount importance and interest. This article is part of the special Issue on 'Neurocircuitry Modulating Drug and Alcohol Abuse'.
Collapse
|