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Siestrup S, Schubotz RI. Minor Changes Change Memories: Functional Magnetic Resonance Imaging and Behavioral Reflections of Episodic Prediction Errors. J Cogn Neurosci 2023; 35:1823-1845. [PMID: 37677059 DOI: 10.1162/jocn_a_02047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/09/2023]
Abstract
Episodic memories can be modified, a process that is potentially driven by mnemonic prediction errors. In the present study, we used modified cues to induce prediction errors of different episodic relevance. Participants encoded episodes in the form of short toy stories and then returned for an fMRI session on the subsequent day. Here, participants were presented either original episodes or slightly modified versions thereof. Modifications consisted of replacing a single object within the episode and either challenged the gist of an episode (gist modifications) or left it intact (surface modifications). On the next day, participants completed a post-fMRI memory test that probed memories for originally encoded episodes. Both types of modifications triggered brain activation in regions we previously found to be involved in the processing of content-based mnemonic prediction errors (i.e., the exchange of an object). Specifically, these were ventrolateral pFC, intraparietal cortex, and lateral occipitotemporal cortex. In addition, gist modifications triggered pronounced brain responses, whereas those for surface modification were only significant in the right inferior frontal sulcus. Processing of gist modifications also involved the posterior temporal cortex and the precuneus. Interestingly, our findings confirmed the posterior hippocampal role of detail processing in episodic memory, as evidenced by increased posterior hippocampal activity for surface modifications compared with gist modifications. In the post-fMRI memory test, previous experience with surface modified, but not gist-modified episodes, increased erroneous acceptance of the same modified versions as originally encoded. Whereas surface-level prediction errors might increase uncertainty and facilitate confusion of alternative episode representations, gist-level prediction errors seem to trigger the clear distinction of independent episodes.
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Affiliation(s)
- Sophie Siestrup
- University of Münster, Germany
- Otto Creutzfeldt Center for Cognitive and Behavioral Neuroscience, University of Münster, Germany
| | - Ricarda I Schubotz
- University of Münster, Germany
- Otto Creutzfeldt Center for Cognitive and Behavioral Neuroscience, University of Münster, Germany
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2
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Saragosa-Harris NM, Guassi Moreira JF, Waizman YH, Sedykin A, Silvers JA, Peris TS. Neural representations of ambiguous affective stimuli and resilience to anxiety in emerging adults. Biol Psychol 2023; 182:108624. [PMID: 37394090 DOI: 10.1016/j.biopsycho.2023.108624] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2022] [Revised: 04/18/2023] [Accepted: 06/26/2023] [Indexed: 07/04/2023]
Abstract
The tendency to interpret ambiguous stimuli as threatening has been associated with a range of anxiety disorders. Responses to ambiguity may be particularly relevant to mental health during the transition from adolescence to adulthood ("emerging adulthood"), when individuals encounter unfamiliar challenges and navigate novel social situations. However, it remains unclear whether neural representations of ambiguity relate to risk for anxiety. The present study sought to examine whether multivariate representations of ambiguity - and their similarity to representations of threat - relate to appraisals of ambiguity or anxiety in a sample of emerging adults. Participants (N = 41) viewed threatening (angry), nonthreatening (happy), and ambiguous (surprised) facial stimuli while undergoing fMRI. Outside of the scanner, participants were presented with the same stimuli and categorized the ambiguous faces as positive or negative. Using representational similarity analyses (RSA), we investigated whether the degree of pattern similarity in responses to ambiguous, nonthreatening, and threatening faces within the amygdala related to appraisals of ambiguous stimuli and anxiety symptomatology. We found that individuals who evidenced greater similarity (i.e., less differentiation) in neural representations of ambiguous and nonthreatening faces within the left amygdala reported lower concurrent anxiety. Additionally, trial-level pattern similarity predicted subsequent appraisals of ambiguous stimuli. These findings provide insight into how neural representations of ambiguity relate to risk or resilience for the development of anxiety.
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Affiliation(s)
- Natalie M Saragosa-Harris
- Department of Psychology, University of California Los Angeles, Los Angeles, CA 90095, United States.
| | - João F Guassi Moreira
- Department of Psychology, University of California Los Angeles, Los Angeles, CA 90095, United States
| | - Yael H Waizman
- Department of Psychology, University of California Los Angeles, Los Angeles, CA 90095, United States
| | - Anna Sedykin
- Jane and Terry Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA 90095, United States
| | - Jennifer A Silvers
- Department of Psychology, University of California Los Angeles, Los Angeles, CA 90095, United States
| | - Tara S Peris
- Jane and Terry Semel Institute for Neuroscience and Human Behavior, University of California Los Angeles, Los Angeles, CA 90095, United States
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3
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Conceptualisation of Uncertainty in Decision Neuroscience Research: Do We Really Know What Types of Uncertainties The Measured Neural Correlates Relate To? Integr Psychol Behav Sci 2023; 57:88-116. [PMID: 35943682 DOI: 10.1007/s12124-022-09719-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/14/2022] [Indexed: 01/13/2023]
Abstract
In the article "What are neural correlates neural correlates of?" published in the journal BioSocieties, Gabriel Abend points out that neuroscientists cannot avoid philosophical questions concerning the conceptualization and operationalization of social-psychological phenomena they deal with at the physiological level. In this article, we build on Abend's thesis and, through a systematic literature review of decision neuroscience studies, test it with the example of the social-psychological phenomenon of uncertainty in decision making. In this paper, we provide an overview of studies that appropriately attempt to conceptualise uncertainty, and then use these studies to analyse papers looking for neural correlates of uncertainty. Based on a systematic review of studies, we investigate what types of uncertainty authors in the field of decision neuroscience address and define, what criteria they use to distinguish between these types, what problems are associated with their conceptualization, and whether the neural correlates of different types of uncertainty can be accurately identified. The paper concludes that, particularly in the economic context, a collaboration between the natural and social sciences works well, and neuroscience studies use economic conceptualizations of uncertainty that are further developed by sophisticated decision tasks. However, the paper also highlights problematic aspects that obscure the understanding of the phenomena under study. These include the lack of criteria for distinguishing between different types of phenomena, the unclear use of the general concept of uncertainty, and the confusion of phenomena or their erroneous synonymous use.
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4
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Zhou Y, Liu L, Sun X. The effects of perception of video image and online word of mouth on tourists' travel intentions: Based on the behaviors of short video platform users. Front Psychol 2022; 13:984240. [PMID: 36160526 PMCID: PMC9493354 DOI: 10.3389/fpsyg.2022.984240] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 08/22/2022] [Indexed: 11/19/2022] Open
Abstract
This research discusses the impact of the perception of video images and online word of mouth on tourists' travel intentions. A survey of 390 users who watched travel videos on short-video platforms was conducted using structural equation modeling. The results are as follows. First, the perception of video images can significantly affect tourists' intention to visit the destinations. Second, as a mediating variable, online word of mouth can enhance the positive effects of the perception of video images on tourists' travel intentions. Third, gender had a positive moderating effect, which was particularly obvious in the relationship between the perception of video images and online word of mouth. This research provides a theoretical basis for the utility of tourism-related short videos, which can help stimulate tourists' intention to visit promoted destinations.
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Affiliation(s)
- Yang Zhou
- Department of Business, Liaoning University, Shenyang, China
| | - Ligang Liu
- Department of Business, Liaoning University, Shenyang, China
| | - Xiao Sun
- College of Culture and Tourism, Jiangsu University of Technology, Changzhou, China
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5
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Morriss J, Gell M, van Reekum CM. The uncertain brain: A co-ordinate based meta-analysis of the neural signatures supporting uncertainty during different contexts. Neurosci Biobehav Rev 2018; 96:241-249. [PMID: 30550858 DOI: 10.1016/j.neubiorev.2018.12.013] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 12/09/2018] [Accepted: 12/10/2018] [Indexed: 12/23/2022]
Abstract
Uncertainty is often inevitable in everyday life and can be both stressful and exciting. Given its relevance to psychopathology and wellbeing, recent research has begun to address the brain basis of uncertainty. In the current review we examined whether there are discrete and shared neural signatures for different uncertain contexts. From the literature we identified three broad categories of uncertainty currently empirically studied using functional MRI (fMRI): basic threat and reward uncertainty, decision-making under uncertainty, and associative learning under uncertainty. We examined the neural basis of each category by using a coordinate based meta-analysis, where brain activation foci from previously published fMRI experiments were drawn together (1998-2017; 87 studies). The analyses revealed shared and discrete patterns of neural activation for uncertainty, such as the insula and amygdala, depending on the category. Such findings will have relevance for researchers attempting to conceptualise uncertainty, as well as clinical researchers examining the neural basis of uncertainty in relation to psychopathology.
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Affiliation(s)
- Jayne Morriss
- Centre for Integrative Neuroscience and Neurodynamics, School of Psychology and Clinical Language Sciences, University of Reading, Reading, UK.
| | - Martin Gell
- Centre for Integrative Neuroscience and Neurodynamics, School of Psychology and Clinical Language Sciences, University of Reading, Reading, UK
| | - Carien M van Reekum
- Centre for Integrative Neuroscience and Neurodynamics, School of Psychology and Clinical Language Sciences, University of Reading, Reading, UK
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Jiang K, Wu S, Shi Z, Liu M, Peng M, Shen Y, Yang J. Activations of the dorsolateral prefrontal cortex and thalamus during agentic self-evaluation are negatively associated with trait self-esteem. Brain Res 2018; 1692:134-141. [PMID: 29777673 DOI: 10.1016/j.brainres.2018.05.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 04/04/2018] [Accepted: 05/15/2018] [Indexed: 11/26/2022]
Abstract
Individual self-esteem is dominated more by agency than by communion. However, prior research has mainly focused on one's agentic/communal self-evaluation, while little is known about how one endorses others' agentic/communal evaluation of the self. The present study investigated the associations between trait self-esteem and fundamental dimensions of social cognition, i.e. agency vs. communion, during both self-evaluation and endorsement of others' evaluation of oneself. We also investigated the neural mechanisms underlying the relationship between trait self-esteem and agentic self-evaluation. Behavioral results revealed that self-esteem was positively correlated with the agentic ratings from self-evaluation and endorsement of others' evaluation of the self, and that the agentic self-evaluation was a significant full mediator between self-esteem and endorsement of others' agentic evaluation. Whole-brain regression analysis revealed that self-esteem was negatively correlated with right dorsolateral prefrontal and bilateral thalamic response to agentic self-evaluation. A possible interpretation is that low self-esteem people both hold a more self-critical attitude about the self and have less certainty or clarity of their self-concepts than high self-esteem people do. These findings have important implication for understanding the neural and cognitive mechanisms underlying self-esteem's effect on one's agentic self-evaluations.
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Affiliation(s)
- Ke Jiang
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Shi Wu
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Zhenhao Shi
- Center for Studies of Addiction, Department of Psychiatry, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA
| | - Mingyan Liu
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Maoying Peng
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Yang Shen
- Faculty of Psychology, Southwest University, Chongqing 400715, China
| | - Juan Yang
- Faculty of Psychology, Southwest University, Chongqing 400715, China.
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7
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Quevedo K, Harms M, Sauder M, Scott H, Mohamed S, Thomas KM, Schallmo MP, Smyda G. The neurobiology of self face recognition among depressed adolescents. J Affect Disord 2018; 229:22-31. [PMID: 29304386 PMCID: PMC5898821 DOI: 10.1016/j.jad.2017.12.023] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 11/20/2017] [Accepted: 12/16/2017] [Indexed: 11/26/2022]
Abstract
OBJECTIVE Depression is linked to alterations in both emotion and self-processing. The current study used functional magnetic resonance imaging (fMRI) to assess neural activation in healthy and depressed youth to a novel task that combined emotion processing with self-face recognition. METHODS An fMRI study involving 81 adolescents (50.6% females; Mage=14.61, SD=1.65) comprised of depressed (DEP, n=43), and healthy controls (HC, n=38). Participants completed a clinical interview and self-report measures during an initial assessment. In the scanner, adolescents completed a face recognition task, viewing emotional (happy, sad, neutral) images of their own face (self) or the face of another youth (other). RESULTS DEP youth showed higher activity in the cuneus (F=26.29) and post and precentral gyri (F=20.76), across all conditions compared to HC. Sad faces elicited higher posterior cingulate cortex, precuneus (F=10.36) and inferior parietal cortex activity (F=11.0), and self faces elicited higher precuneus, fusiform (F=16.39), insula and putamen (F=16.82) activity in all youth. DEP showed higher middle temporal activity to neutral faces but lower activity to sad faces compared to HC, who showed the opposite pattern (F=12.86). DEP also showed hypoactive mid-temporal limbic activity relative to controls when identifying their self happy face vs. neutral face, yet showed hyperactivity when identifying the other happy face vs. neutral face, and HC showed the opposite pattern (F=10.94). CONCLUSIONS The neurophysiology of self-face recognition is altered in adolescent depression. Specifically, depression was associated with decreased activity in neural areas that support emotional and associative processing for positive self-faces and increased processing for neutral self-faces. These results suggest that depression in adolescents is associated with hypoactive emotional processing and encoding of positive self-related visual information. This abnormal neural activity at the intersection of reward and self-processing among depressed youth might have long lasting impact in self-formation and future adult self-representations, given that adolescence is a sensitive period for self-development.
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Affiliation(s)
- Karina Quevedo
- University of Minnesota, Department of Psychiatry, MN, USA.
| | - Madeline Harms
- University of Minnesota, Institute of Child Development, 51 East River Road, Minneapolis, MN 55455, USA.
| | | | - Hannah Scott
- University of Minnesota, Department of Psychiatry, MN, USA.
| | - Sumaya Mohamed
- University of Minnesota, Department of Psychiatry, MN, USA
| | - Kathleen M Thomas
- University of Minnesota, Institute of Child Development, 51 East River Road, Minneapolis, MN 55455, USA.
| | | | - Garry Smyda
- University of Pittsburgh, School of Public Health, 130 De Soto Street, Pittsburgh, PA 15261, USA.
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8
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de Bézenac CE, Sluming V, Gouws A, Corcoran R. Neural response to modulating the probability that actions of self or other result in auditory tones: A parametric fMRI study into causal ambiguity. Biol Psychol 2016; 119:64-78. [PMID: 27381929 DOI: 10.1016/j.biopsycho.2016.07.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 07/01/2016] [Indexed: 01/26/2023]
Abstract
In normal circumstances we can easily distinguish between changes to the external world brought about by our own actions from those with external causes. However, in certain contexts our sense of ownership and agency over acts is not so clear. Neuroimaging studies have implicated a number of regions in the sense of agency, some of which have been shown to vary continuously with action-outcome discordance. However, little is known about dynamic, ambiguous contexts characterised by a lack of information for self-other differentiation, yet such ambiguous states are important in relation to symptoms and levels of consciousness that characterise certain mental health conditions. With a block-design fMRI paradigm, we investigated neural responses to changes in the probability that a participant's irregular finger taps over 12s would result in auditory tones as opposed to tones generated by 'another's finger taps'. The main findings were that misattribution increased in ambiguous conditions where the probability of a tone belonging to self and other was equal. Task-sensitive brain regions, previously identified in self-agency, motor cognition, and ambiguity processing, showed a quadratic response to our self-to-other manipulation, with particular sensitivity to self-control. Task performance (low error and bias) was related to attenuated response in ambiguous conditions while increased response in regions associated with the default mode network was associated with greater overall error and bias towards other. These findings suggest that causal ambiguity as it occurs over time is a prominent feature in sense of agency, one that may eventually contribute to a more comprehensive understanding of positive symptoms of psychosis.
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Affiliation(s)
- Christophe E de Bézenac
- Psychological Sciences, University of Liverpool, Waterhouse Building, Block B, 2nd Floor, L69 3BX, United Kingdom.
| | - Vanessa Sluming
- School of Health Sciences, Thompson Yates Building, The Quadrangle, Brownlow Hill, Liverpool L69 3GB, United Kingdom.
| | - André Gouws
- York Neuroimaging Centre (YNiC), The Biocentre, York Science Park, Heslington, York YO10 5NY, United Kingdom.
| | - Rhiannon Corcoran
- Psychological Sciences, University of Liverpool, Waterhouse Building, Block B, 2nd Floor, L69 3BX, United Kingdom.
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9
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Evans GW, Swain JE, King AP, Wang X, Javanbakht A, Ho SS, Angstadt M, Phan KL, Xie H, Liberzon I. Childhood Cumulative Risk Exposure and Adult Amygdala Volume and Function. J Neurosci Res 2016; 94:535-43. [PMID: 26469872 PMCID: PMC4833698 DOI: 10.1002/jnr.23681] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 09/13/2015] [Accepted: 09/28/2015] [Indexed: 01/29/2023]
Abstract
Considerable work indicates that early cumulative risk exposure is aversive to human development, but very little research has examined the neurological underpinnings of these robust findings. This study investigates amygdala volume and reactivity to facial stimuli among adults (mean 23.7 years of age, n = 54) as a function of cumulative risk exposure during childhood (9 and 13 years of age). In addition, we test to determine whether expected cumulative risk elevations in amygdala volume would mediate functional reactivity of the amygdala during socioemotional processing. Risks included substandard housing quality, noise, crowding, family turmoil, child separation from family, and violence. Total and left hemisphere adult amygdala volumes were positively related to cumulative risk exposure during childhood. The links between childhood cumulative risk exposure and elevated amygdala responses to emotionally neutral facial stimuli in adulthood were mediated by the corresponding amygdala volumes. Cumulative risk exposure in later adolescence (17 years of age), however, was unrelated to subsequent adult amygdala volume or function. Physical and socioemotional risk exposures early in life appear to alter amygdala development, rendering adults more reactive to ambiguous stimuli such as neutral faces. These stress-related differences in childhood amygdala development might contribute to the well-documented psychological distress as a function of early risk exposure.
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Affiliation(s)
- Gary W Evans
- Departments of Design and Environmental Analysis and of Human Development, Bronfenbrenner Center for Translational Research, Cornell University, Ithaca, New York
| | - James E Swain
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan
- Yale Child Study Center, Yale University, New Haven, Connecticut
| | - Anthony P King
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan
| | - Xin Wang
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan
| | - Arash Javanbakht
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan
- Department of Psychiatry and Neuroscience, Wayne State University, Detroit, Michigan
| | - S Shaun Ho
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan
| | - Michael Angstadt
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan
| | - K Luan Phan
- Department of Psychiatry, University of Illinois at Chicago, Chicago, Illinois
| | - Hong Xie
- Department of Neuroscience, University of Toledo, Toledo, Ohio
| | - Israel Liberzon
- Department of Psychiatry, University of Michigan, Ann Arbor, Michigan
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10
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de Bézenac CE, Sluming V, O'Sullivan N, Corcoran R. Ambiguity between self and other: Individual differences in action attribution. Conscious Cogn 2015; 35:1-15. [PMID: 25956971 DOI: 10.1016/j.concog.2015.04.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 04/13/2015] [Accepted: 04/17/2015] [Indexed: 11/26/2022]
Abstract
Individuals differ in their ability to attribute actions to self or other. This variance is thought to explain, in part, the experience of voice-hearing. Misattribution can also be context-driven. For example, causal ambiguity can arise when the actions of two or more individuals are coordinated and produce similar effects (e.g., music-making). Experience in such challenging contexts may refine skills of action attribution. Forty participants completed a novel finger-tapping task which parametrically manipulated the proportion of control that 'self' versus 'other' possessed over resulting auditory tones. Results showed that action misattribution peaked in the middle of the self-to-other continuum and was biased towards other. This pattern was related to both high hallucination-proneness and to low musical-experience. Findings suggest not only that causal ambiguity plays a key role in agency but also that action attribution abilities may improve with practice, potentially providing an avenue for remediation of the positive symptoms of schizophrenia.
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Affiliation(s)
- Christophe E de Bézenac
- Psychological Sciences, University of Liverpool, Waterhouse Building, Block B, 2nd Floor, L69 3BX, United Kingdom.
| | - Vanessa Sluming
- Institute of Translational Medicine, Whelan Building, The Quadrangle, Brownlow Hill, Liverpool L69 3 GB, United Kingdom.
| | - Noreen O'Sullivan
- Psychological Sciences, University of Liverpool, Waterhouse Building, Block B, 2nd Floor, L69 3BX, United Kingdom.
| | - Rhiannon Corcoran
- Psychological Sciences, University of Liverpool, Waterhouse Building, Block B, 2nd Floor, L69 3BX, United Kingdom.
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11
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Okon-Singer H, Hendler T, Pessoa L, Shackman AJ. The neurobiology of emotion-cognition interactions: fundamental questions and strategies for future research. Front Hum Neurosci 2015; 9:58. [PMID: 25774129 PMCID: PMC4344113 DOI: 10.3389/fnhum.2015.00058] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 01/21/2015] [Indexed: 12/18/2022] Open
Abstract
Recent years have witnessed the emergence of powerful new tools for assaying the brain and a remarkable acceleration of research focused on the interplay of emotion and cognition. This work has begun to yield new insights into fundamental questions about the nature of the mind and important clues about the origins of mental illness. In particular, this research demonstrates that stress, anxiety, and other kinds of emotion can profoundly influence key elements of cognition, including selective attention, working memory, and cognitive control. Often, this influence persists beyond the duration of transient emotional challenges, partially reflecting the slower molecular dynamics of catecholamine and hormonal neurochemistry. In turn, circuits involved in attention, executive control, and working memory contribute to the regulation of emotion. The distinction between the 'emotional' and the 'cognitive' brain is fuzzy and context-dependent. Indeed, there is compelling evidence that brain territories and psychological processes commonly associated with cognition, such as the dorsolateral prefrontal cortex and working memory, play a central role in emotion. Furthermore, putatively emotional and cognitive regions influence one another via a complex web of connections in ways that jointly contribute to adaptive and maladaptive behavior. This work demonstrates that emotion and cognition are deeply interwoven in the fabric of the brain, suggesting that widely held beliefs about the key constituents of 'the emotional brain' and 'the cognitive brain' are fundamentally flawed. We conclude by outlining several strategies for enhancing future research. Developing a deeper understanding of the emotional-cognitive brain is important, not just for understanding the mind but also for elucidating the root causes of its disorders.
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Affiliation(s)
| | - Talma Hendler
- Functional Brain Center, Wohl Institute of Advanced Imaging, and School of Psychological Sciences, Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, Tel AvivIsrael
| | - Luiz Pessoa
- Department of Psychology, Neuroscience and Cognitive Science Program, and Maryland Neuroimaging Center, University of Maryland, College Park, College Park, MDUSA
| | - Alexander J. Shackman
- Department of Psychology, Neuroscience and Cognitive Science Program, and Maryland Neuroimaging Center, University of Maryland, College Park, College Park, MDUSA
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12
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Wheelock MD, Sreenivasan KR, Wood KH, Ver Hoef LW, Deshpande G, Knight DC. Threat-related learning relies on distinct dorsal prefrontal cortex network connectivity. Neuroimage 2014; 102 Pt 2:904-12. [PMID: 25111474 DOI: 10.1016/j.neuroimage.2014.08.005] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 07/23/2014] [Accepted: 08/02/2014] [Indexed: 10/24/2022] Open
Abstract
Conditioned changes in the emotional response to threat (e.g. aversive unconditioned stimulus; UCS) are mediated in part by the prefrontal cortex (PFC). Unpredictable threats elicit large emotional responses, while the response is diminished when the threat is predictable. A better understanding of how PFC connectivity to other brain regions varies with threat predictability would provide important insights into the neural processes that mediate conditioned diminution of the emotional response to threat. The present study examined brain connectivity during predictable and unpredictable threat exposure using a fear conditioning paradigm (previously published in Wood et al., 2012) in which unconditioned functional magnetic resonance imaging data were reanalyzed to assess effective connectivity. Granger causality analysis was performed using the time series data from 15 activated regions of interest after hemodynamic deconvolution, to determine regional effective connectivity. In addition, connectivity path weights were correlated with trait anxiety measures to assess the relationship between negative affect and brain connectivity. Results indicate the dorsomedial PFC (dmPFC) serves as a neural hub that influences activity in other brain regions when threats are unpredictable. In contrast, the dorsolateral PFC (dlPFC) serves as a neural hub that influences the activity of other brain regions when threats are predictable. These findings are consistent with the view that the dmPFC coordinates brain activity to take action, perhaps in a reactive manner, when an unpredicted threat is encountered, while the dlPFC coordinates brain regions to take action, in what may be a more proactive manner, to respond to predictable threats. Further, dlPFC connectivity to other brain regions (e.g. ventromedial PFC, amygdala, and insula) varied with negative affect (i.e. trait anxiety) when the UCS was predictable, suggesting that stronger connectivity may be required for emotion regulation in individuals with higher levels of negative affect.
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Affiliation(s)
- M D Wheelock
- Department of Psychology, University of Alabama at Birmingham, USA
| | - K R Sreenivasan
- AU MRI Research Center, Department of Electrical and Computer Engineering, Auburn University, Auburn, AL, USA
| | - K H Wood
- Department of Psychology, University of Alabama at Birmingham, USA
| | - L W Ver Hoef
- Department of Neurology, University of Alabama at Birmingham, School of Medicine, Birmingham VA Medical Center, USA
| | - Gopikrishna Deshpande
- AU MRI Research Center, Department of Electrical and Computer Engineering, Auburn University, Auburn, AL, USA; Department of Psychology, Auburn University, Auburn, AL, USA
| | - D C Knight
- Department of Psychology, University of Alabama at Birmingham, USA.
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13
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Luciana M, Segalowitz SJ. Some challenges for the triadic model for the study of adolescent motivated behavior. Brain Cogn 2014; 89:118-21. [PMID: 24973152 DOI: 10.1016/j.bandc.2014.05.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/28/2014] [Indexed: 01/25/2023]
Abstract
Within this special issue, Ernst has provided a comprehensive overview of the triadic neural systems model and its explanatory power for the conceptualization of adolescent development. Within this commentary, we encourage further consideration of several issues as this valuable model is expanded and articulated. These issues include the extent of functional distinctions among the three proposed neural nodes that comprise the triadic framework, the proposed dichotomy between motivation and emotion as linked to approach versus avoidance, the extent to which approach and avoidance can be dissociated on behavioral and neural levels during adolescent development, and how individual difference factors mechanistically interact with broader age-based developmental trends.
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Affiliation(s)
- Monica Luciana
- Department of Psychology and Center for Neurobehavioral Development, University of Minnesota, United States.
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14
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Potvin P, Turmel E, Masson S. Linking neuroscientific research on decision making to the educational context of novice students assigned to a multiple-choice scientific task involving common misconceptions about electrical circuits. Front Hum Neurosci 2014; 8:14. [PMID: 24478680 PMCID: PMC3902357 DOI: 10.3389/fnhum.2014.00014] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Accepted: 01/07/2014] [Indexed: 11/13/2022] Open
Abstract
Functional magnetic resonance imaging was used to identify the brain-based mechanisms of uncertainty and certainty associated with answers to multiple-choice questions involving common misconceptions about electric circuits. Twenty-two scientifically novice participants (humanities and arts college students) were asked, in an fMRI study, whether or not they thought the light bulbs in images presenting electric circuits were lighted up correctly, and if they were certain or uncertain of their answers. When participants reported that they were unsure of their responses, analyses revealed significant activations in brain areas typically involved in uncertainty (anterior cingulate cortex, anterior insula cortex, and superior/dorsomedial frontal cortex) and in the left middle/superior temporal lobe. Certainty was associated with large bilateral activations in the occipital and parietal regions usually involved in visuospatial processing. Correct-and-certain answers were associated with activations that suggest a stronger mobilization of visual attention resources when compared to incorrect-and-certain answers. These findings provide insights into brain-based mechanisms of uncertainty that are activated when common misconceptions, identified as such by science education research literature, interfere in decision making in a school-like task. We also discuss the implications of these results from an educational perspective.
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Affiliation(s)
| | - Elaine Turmel
- Université du Québec à Montréal Montréal, QC, Canada
| | - Steve Masson
- Université du Québec à Montréal Montréal, QC, Canada
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15
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Storage S, Mandelkern MA, Phuong J, Kozman M, Neary MK, Brody AL. A positive relationship between harm avoidance and brain nicotinic acetylcholine receptor availability. Psychiatry Res 2013; 214:415-21. [PMID: 24148908 PMCID: PMC3851586 DOI: 10.1016/j.pscychresns.2013.07.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2012] [Revised: 06/22/2013] [Accepted: 07/25/2013] [Indexed: 01/28/2023]
Abstract
Prior research indicates that disturbance of cholinergic neurotransmission reduces anxiety, leading to the hypothesis that people with heightened cholinergic function have a greater tendency toward anxiety-like and/or harm-avoidant behavior. We sought to determine if people with elevated levels of harm avoidance (HA), a dimension of temperament from the Temperament and Character Inventory (TCI), have high α4β2* nicotinic acetylcholine receptor (nAChR) availability. Healthy adults (n=105; 47 non-smokers and 58 smokers) underwent bolus-plus-continuous infusion positron emission tomography (PET) scanning using the radiotracer 2-[18F]fluoro-3-(2(S)azetidinylmethoxy) pyridine (abbreviated as 2-FA). During the uptake period of 2-FA, participants completed the TCI. The central study analysis revealed a significant association between total HA and mean nAChR availability, with higher total HA scores being linked with greater nAChR availability. In examining HA subscales, both 'Fear of Uncertainty' and 'Fatigability' were significant, based on higher levels of these characteristics being associated with greater nAChR availabilities. This study adds to a growing body of knowledge concerning the biological basis of personality and may prove useful in understanding the pathophysiology of psychiatric disorders (such as anxiety disorders) that have similar characteristics to HA. Study findings may indicate that heightened cholinergic neurotransmission is associated with increased anxiety-like traits.
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Affiliation(s)
- Steven Storage
- UCLA School of Medicine, Los Angeles, California, USA,Department of Research, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | - Mark A. Mandelkern
- Department of Research, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA,Department of Physics, University of California at Irvine, California, USA
| | - Jonathan Phuong
- Department of Research, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | - Maggie Kozman
- Department of Research, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | - Meaghan K. Neary
- Department of Research, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | - Arthur L. Brody
- UCLA School of Medicine, Los Angeles, California, USA,Department of Research, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA,Department of Psychiatry, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA,Corresponding author at: UCLA Department of Psychiatry & Biobehavioral Sciences 300 UCLA Medical Plaza, Suite 2200 Los Angeles, CA 90095. Tel.: +310 268 4778; fax: +310 206 2802.
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16
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Admon R, Milad MR, Hendler T. A causal model of post-traumatic stress disorder: disentangling predisposed from acquired neural abnormalities. Trends Cogn Sci 2013; 17:337-47. [PMID: 23768722 DOI: 10.1016/j.tics.2013.05.005] [Citation(s) in RCA: 189] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 05/06/2013] [Accepted: 05/08/2013] [Indexed: 12/11/2022]
Abstract
Discriminating neural abnormalities into the causes versus consequences of psychopathology would enhance the translation of neuroimaging findings into clinical practice. By regarding the traumatic encounter as a reference point for disease onset, neuroimaging studies of post-traumatic stress disorder (PTSD) can potentially allocate PTSD neural abnormalities to either predisposing (pre-exposure) or acquired (post-exposure) factors. Based on novel research strategies in PTSD neuroimaging, including genetic, environmental, twin, and prospective studies, we provide a causal model that accounts for neural abnormalities in PTSD, and outline its clinical implications. Current data suggest that abnormalities within the amygdala and dorsal anterior cingulate cortex represent predisposing risk factors for developing PTSD, whereas dysfunctional hippocampal-ventromedial prefrontal cortex (vmPFC) interactions may become evident only after having developed the disorder.
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Affiliation(s)
- Roee Admon
- Center for Depression, Anxiety and Stress Research, McLean Hospital, Harvard Medical School, Boston, MA, USA.
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17
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Blechert J, Schwitalla M, Wilhelm FH. Ein Video-Set zur experimentellen Untersuchung von Emotionen bei sozialen Interaktionen: Validierung und erste Daten zu neuronalen Effekten. ACTA ACUST UNITED AC 2013. [DOI: 10.1024/1661-4747/a000145] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Soziale Interaktionen sind vielschichtig und stellen häufige Auslöser für positive aber auch negative Emotionen im Alltag dar. Viele Psychopathologien sind zudem von gestörter Sozialinteraktion gekennzeichnet. Laborexperimentelle Ansätze, welche neurowissenschaftliche Untersuchungen ermöglichen, verwenden häufig Bilder von emotionalen Gesichtern, die präzise Präsentationsbedingungen ermöglichen und die interne Validität solcher Experimente maximieren. Allerdings wird dadurch die Reichhaltigkeit sozialer Interaktion und damit auch die externe Validität reduziert. In der vorliegenden Studie wird ein Kompromiss zwischen interner und externer Validität bei der Untersuchung sozialer Interaktion gesucht. Wir stellen das Video-Set «E.Vids» vor, in dem zehn Darsteller jeweils acht kurze, auf den Betrachter bezogene positive und negative sowie neutrale Aussagen machen (240 Videos). In einer Internet-basierten Validierungsstudie (N = 310) wurden die Videos sowohl auf dimensionalen (Valenz, Arousal) als auch auf diskreten Emotionskategorien untersucht. Es zeigte sich eine klare Unterscheidung der Aussagekategorien in Bezug auf Valenz und Arousal. Spezifisch wurden sozialrelevante emotionsbezogene Zustände wie Stolz, Anerkennung, Ablehnung und Peinlichkeit sowie Grundemotionen wie Ärger und Freude ausgelöst. Eine EEG-Studie (N = 23) zeigte negativere rechts-frontotemporale langsame Potentiale für die negativen Sätze im Vergleich zu neutralen Sätzen. E.Vids könnte die verhaltensbasierte und neurowissenschaftliche Erforschung sozialer Interaktion im deutschsprachigen Raum bereichern und zur Untersuchung sozialrelevanter emotionaler Defizite bei verschiedenen psychischen Störungen beitragen.
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Affiliation(s)
- Jens Blechert
- Abteilung für Klinische Psychologie, Psychotherapie und Gesundheitspsychologie, Universität Salzburg
| | - Maria Schwitalla
- Abteilung für Klinische Psychologie, Psychotherapie und Gesundheitspsychologie, Universität Salzburg
| | - Frank H. Wilhelm
- Abteilung für Klinische Psychologie, Psychotherapie und Gesundheitspsychologie, Universität Salzburg
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18
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Cognitive and Emotional Abnormalities in Systemic Lupus Erythematosus: Evidence for Amygdala Dysfunction. Neuropsychol Rev 2012; 22:252-70. [DOI: 10.1007/s11065-012-9213-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 07/27/2012] [Indexed: 12/23/2022]
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Specifying the neurobiological basis of human attachment: brain, hormones, and behavior in synchronous and intrusive mothers. Neuropsychopharmacology 2011; 36:2603-15. [PMID: 21881566 PMCID: PMC3230500 DOI: 10.1038/npp.2011.172] [Citation(s) in RCA: 229] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The mother-infant bond provides the foundation for the infant's future mental health and adaptation and depends on the provision of species-typical maternal behaviors that are supported by neuroendocrine and motivation-affective neural systems. Animal research has demonstrated that natural variations in patterns of maternal care chart discrete profiles of maternal brain-behavior relationships that uniquely shape the infant's lifetime capacities for stress regulation and social affiliation. Such patterns of maternal care are mediated by the neuropeptide Oxytocin and by stress- and reward-related neural systems. Human studies have similarly shown that maternal synchrony--the coordination of maternal behavior with infant signals--and intrusiveness--the excessive expression of maternal behavior--describe distinct and stable maternal styles that bear long-term consequences for infant well-being. To integrate brain, hormones, and behavior in the study of maternal-infant bonding, we examined the fMRI responses of synchronous vs intrusive mothers to dynamic, ecologically valid infant videos and their correlations with plasma Oxytocin. In all, 23 mothers were videotaped at home interacting with their infants and plasma OT assayed. Sessions were micro-coded for synchrony and intrusiveness. Mothers were scanned while observing several own and standard infant-related vignettes. Synchronous mothers showed greater activations in the left nucleus accumbens (NAcc) and intrusive mothers exhibited higher activations in the right amygdala. Functional connectivity analysis revealed that among synchronous mothers, left NAcc and right amygdala were functionally correlated with emotion modulation, theory-of-mind, and empathy networks. Among intrusive mothers, left NAcc and right amygdala were functionally correlated with pro-action areas. Sorting points into neighborhood (SPIN) analysis demonstrated that in the synchronous group, left NAcc and right amygdala activations showed clearer organization across time, whereas among intrusive mothers, activations of these nuclei exhibited greater cross-time disorganization. Correlations between Oxytocin with left NAcc and right amygdala activations were found only in the synchronous group. Well-adapted parenting appears to be underlay by reward-related motivational mechanisms, temporal organization, and affiliation hormones, whereas anxious parenting is likely mediated by stress-related mechanisms and greater neural disorganization. Assessing the integration of motivation and social networks into unified neural activity that reflects variations in patterns of parental care may prove useful for the study of optimal vs high-risk parenting.
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20
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Lerner Y, Singer N, Gonen T, Weintraub Y, Cohen O, Rubin N, Ungerleider LG, Hendler T. Feeling without seeing? Engagement of ventral, but not dorsal, amygdala during unaware exposure to emotional faces. J Cogn Neurosci 2011; 24:531-42. [PMID: 22098264 DOI: 10.1162/jocn_a_00165] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The ability to selectively perceive items in the environment may be modulated by the emotional content of those items. The neural mechanism that underlies the privileged processing of emotionally salient content is poorly understood. Here, using fMRI, we investigated this issue via a binocular rivalry procedure when face stimuli depicting fearful or neutral expressions competed for awareness with a house. Results revealed an interesting dissociation in the amygdala during rivalry condition: Whereas its dorsal component exhibited dominant activation to aware fearful faces, a ventral component was more active during the suppression of fearful faces. Moreover, during rivalry, the dorsal and ventral components of the amygdala were coupled with segregated cortical activations in the brainstem and medial PFC, respectively. In summary, this study points to a differential involvement of two clusters within the amygdala and their connected networks in naturally occurring perceptual biases of emotional content in faces.
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21
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Mushtaq F, Bland AR, Schaefer A. Uncertainty and cognitive control. Front Psychol 2011; 2:249. [PMID: 22007181 PMCID: PMC3184613 DOI: 10.3389/fpsyg.2011.00249] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2011] [Accepted: 09/11/2011] [Indexed: 11/13/2022] Open
Abstract
A growing trend of neuroimaging, behavioral, and computational research has investigated the topic of outcome uncertainty in decision-making. Although evidence to date indicates that humans are very effective in learning to adapt to uncertain situations, the nature of the specific cognitive processes involved in the adaptation to uncertainty are still a matter of debate. In this article, we reviewed evidence suggesting that cognitive control processes are at the heart of uncertainty in decision-making contexts. Available evidence suggests that: (1) There is a strong conceptual overlap between the constructs of uncertainty and cognitive control; (2) There is a remarkable overlap between the neural networks associated with uncertainty and the brain networks subserving cognitive control; (3) The perception and estimation of uncertainty might play a key role in monitoring processes and the evaluation of the "need for control"; (4) Potential interactions between uncertainty and cognitive control might play a significant role in several affective disorders.
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Affiliation(s)
- Faisal Mushtaq
- Institute of Psychological Sciences, University of Leeds Leeds, UK
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22
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Hori E, Takamoto K, Urakawa S, Ono T, Nishijo H. Effects of acupuncture on the brain hemodynamics. Auton Neurosci 2011; 157:74-80. [PMID: 20605114 DOI: 10.1016/j.autneu.2010.06.007] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2009] [Revised: 04/27/2010] [Accepted: 06/15/2010] [Indexed: 12/30/2022]
Abstract
Acupuncture therapy has been applied to various psychiatric diseases and chronic pain since acupuncture stimulation might affect brain activity. From this point of view, we investigated the effects of acupuncture on autonomic nervous system and brain hemodynamics in human subjects using ECGs, EEGs and near-infrared spectroscopy (NIRS). Our previous studies reported that changes in parasympathetic nervous activity were correlated with number of de-qi sensations during acupuncture manipulation. Furthermore, these autonomic changes were correlated with EEG spectral changes. These results are consistent with the suggestion that autonomic changes induced by needle manipulation inducing specific de-qi sensations might be mediated through the central nervous system, especially through the forebrain as shown in EEG changes, and are beneficial to relieve chronic pain by inhibiting sympathetic nervous activity. The NIRS results indicated that acupuncture stimulation with de-qi sensation significantly decreased activity in the supplementary motor complex (SMC) and dorsomedial prefrontal cortex (DMPFC). Based on these results, we review that hyperactivity in the SMC is associated with dystonia and chronic pain, and that in the DMPFC is associated with various psychiatric diseases with socio-emotional disturbances such as schizophrenia, attention deficit hyperactive disorder, etc. These findings along with the previous studies suggest that acupuncture with de-qi sensation might be effective to treat the various diseases in which hyperactivity in the SMA and DMPFC is suspected of playing a role.
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Affiliation(s)
- Etsuro Hori
- System Emotional Science, Graduate school of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan
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23
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Schilbach L, Eickhoff SB, Cieslik E, Shah NJ, Fink GR, Vogeley K. Eyes on me: an fMRI study of the effects of social gaze on action control. Soc Cogn Affect Neurosci 2010; 6:393-403. [PMID: 20705602 DOI: 10.1093/scan/nsq067] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Previous evidence suggests that 'social gaze' can not only cause shifts in attention, but also can change the perception of objects located in the direction of gaze and how these objects will be manipulated by an observer. These findings implicate differences in the neural networks sub-serving action control driven by social cues as compared with nonsocial cues. Here, we sought to explore this hypothesis by using functional magnetic resonance imaging and a stimulus-response compatibility paradigm in which participants were asked to generate spatially congruent or incongruent motor responses to both social and nonsocial stimuli. Data analysis revealed recruitment of a dorsal frontoparietal network and the locus coeruleus for the generation of incongruent motor responses, areas previously implicated in controlling attention. As a correlate for the effect of 'social gaze' on action control, an interaction effect was observed for incongruent responses to social stimuli in sub-cortical structures, anterior cingulate and inferior frontal cortex. Our results, therefore, suggest that performing actions in a--albeit minimal--social context significantly changes the neural underpinnings of action control and recruits brain regions previously implicated in action monitoring, the reorienting of attention and social cognition.
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Affiliation(s)
- Leonhard Schilbach
- Department of Psychiatry, University of Cologne, Kerpener Str. 62, 50924 Cologne, Germany.
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