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Bosnyak D, McDonald AC, Gasperin Haaz I, Qi W, Crowley DC, Guthrie N, Evans M. Use of a Novel EEG-Based Objective Test, the Cognalyzer ®, in Quantifying the Strength and Determining the Action Time of Cannabis Psychoactive Effects and Factors that May Influence Them Within an Observational Study Framework. Neurol Ther 2021; 11:51-72. [PMID: 34727345 PMCID: PMC8857346 DOI: 10.1007/s40120-021-00293-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 10/13/2021] [Indexed: 11/30/2022] Open
Abstract
Introduction Current methods to detect recent delta-9-tetrahydrocannabinol (THC) use cannot objectively quantify its psychoactive effects (PE). The Cognalyzer®, an electroencephalography (EEG)-based method, detects and quantifies the strength of THC-induced PE on a scale from 0 to 100%. This study assesses the relationship between the magnitude of Cognalyzer® PE predictions and reported subjective drug effects for 4-h post-cannabis inhalation. Methods Seventy-five participants were enrolled in the study. Prior to ad libitum cannabis inhalation, an EEG recording episode was completed. Immediately after inhalation, the Drug Effects Questionnaire (DEQ) was administered and another EEG recording performed. For 25 participants, the study ended. For 50 participants, assessments were repeated at 30-min intervals for 4 h. EEG files were blinded and analyzed using two versions of the Cognalyzer® algorithm. The relationship between the Cognalyzer® PE level results and the DEQ was assessed using generalized linear models and multiple regression. Results There were significant PE increases from pre-cannabis for up to 3.5 h. Mean reports of feeling drug effects were > 0 at all post-inhalation time points (p ≤ 0.024). Furthermore, there were significant relationships between the Cognalyzer® PE and self-reported perception of drug effects (p ≤ 0.001). Subgroup analysis showed that Cognalyzer® PE levels were impacted by cannabis use history, subjective ratings of drug effects, oral fluid THC concentration and the cannabis product inhaled. Conclusion The findings show that the Cognalyzer® can be used to objectively determine the strength of cannabis psychoactive effects that cannabis products create on consumers and how it changes depending on their experience with cannabis. The Cognalyzer® can be used to conduct scientific consumer research to generate trustworthy informational material about the psychoactive experience of cannabis products. For clinical research, the Cognalyzer® can be used to study the pharmacodynamics of cannabinoids or delivery systems, such as nano-emulsifications.
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Affiliation(s)
- Dan Bosnyak
- Zentrela Inc. Suite B21, 175 Longwood Rd S, Hamilton, ON, L8P 0A1, Canada.
| | | | | | - Weikai Qi
- Zentrela Inc. Suite B21, 175 Longwood Rd S, Hamilton, ON, L8P 0A1, Canada
| | - David C Crowley
- KGK Science Inc., 255 Queens Ave, London, ON, N6A 5R8, Canada
| | - Najla Guthrie
- KGK Science Inc., 255 Queens Ave, London, ON, N6A 5R8, Canada
| | - Malkanthi Evans
- KGK Science Inc., 255 Queens Ave, London, ON, N6A 5R8, Canada
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2
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Adam KCS, Doss MK, Pabon E, Vogel EK, de Wit H. Δ 9-Tetrahydrocannabinol (THC) impairs visual working memory performance: a randomized crossover trial. Neuropsychopharmacology 2020; 45:1807-1816. [PMID: 32386395 PMCID: PMC7608353 DOI: 10.1038/s41386-020-0690-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 04/01/2020] [Accepted: 04/23/2020] [Indexed: 01/02/2023]
Abstract
With the increasing prevalence of legal cannabis use and availability, there is an urgent need to identify cognitive impairments related to its use. It is widely believed that cannabis, or its main psychoactive component Δ9-tetrahydrocannabinol (THC), impairs working memory, i.e., the ability to temporarily hold information in mind. However, our review of the literature yielded surprisingly little empirical support for an effect of THC or cannabis on working memory. We thus conducted a study with three main goals: (1) quantify the effect of THC on visual working memory in a well-powered sample, (2) test the potential role of cognitive effects (mind wandering and metacognition) in disrupting working memory, and (3) demonstrate how insufficient sample size and task duration reduce the likelihood of detecting a drug effect. We conducted two double-blind, randomized crossover experiments in which healthy adults (N = 23, 23) performed a reliable and validated visual working memory task (the "Discrete Whole Report task", 90 trials) after administration of THC (7.5 and/or 15 mg oral) or placebo. We also assessed self-reported "mind wandering" (Exp 1) and metacognitive accuracy about ongoing task performance (Exp 2). THC impaired working memory performance (d = 0.65), increased mind wandering (Exp 1), and decreased metacognitive accuracy about task performance (Exp 2). Thus, our findings indicate that THC does impair visual working memory, and that this impairment may be related to both increased mind wandering and decreased monitoring of task performance. Finally, we used a down-sampling procedure to illustrate the effects of task length and sample size on power to detect the acute effect of THC on working memory.
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Affiliation(s)
- Kirsten C S Adam
- Department of Psychology, University of California San Diego, San Diego, CA, USA.
- Institute for Neural Computation, University of California San Diego, San Diego, CA, USA.
| | - Manoj K Doss
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University, Baltimore, MD, USA
- Center for Psychedelic and Consciousness Research, Johns Hopkins University, Baltimore, MD, USA
| | - Elisa Pabon
- Department of Psychiatry and Behavioral Neuroscience, University of Chicago, Chicago, IL, USA
- Grossman Institute for Neuroscience, Quantitative Biology, and Human Behavior, University of Chicago, Chicago, IL, USA
| | - Edward K Vogel
- Grossman Institute for Neuroscience, Quantitative Biology, and Human Behavior, University of Chicago, Chicago, IL, USA
- Department of Psychology, University of Chicago, Chicago, IL, USA
- Institute for Mind and Biology, University of Chicago, Chicago, IL, USA
| | - Harriet de Wit
- Department of Psychiatry and Behavioral Neuroscience, University of Chicago, Chicago, IL, USA
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3
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Sullivan RM, Perlman G, Moeller SJ. Meta-analysis of aberrant post-error slowing in substance use disorder: implications for behavioral adaptation and self-control. Eur J Neurosci 2019; 50:2467-2476. [PMID: 30383336 PMCID: PMC6494729 DOI: 10.1111/ejn.14229] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 09/28/2018] [Accepted: 10/08/2018] [Indexed: 11/30/2022]
Abstract
Individual with substance use disorders have well-recognized impairments in cognitive control, including in behavioral adaptation after mistakes. One way in which this impairment manifests is via diminished post-error slowing, the increase in reaction time following a task-related error that is posited to reflect cautionary or corrective behavior. Yet, in the substance use disorder literature, findings with regard to post-error slowing have been inconsistent, and thus could benefit from quantitative integration. Here, we conducted a meta-analysis of case-control studies examining post-error slowing in addiction. Twelve studies with 15 unique comparisons were identified, comprising 567 substance users and 384 healthy controls across three broad types of inhibitory control paradigms (go-no/go, conflict resolution, and stop signal tasks, respectively). Results of the random-effects meta-analysis revealed a moderate group difference across all studies (Cohen's d = 0.31), such that the individuals with substance use disorder had diminished post-error slowing compared with controls. Despite this omnibus effect, there was also large variability in the magnitude of the effects, explained in part by differences between studies in task complexity. These findings suggest that post-error slowing may serve as a promising and easy-to-implement measure of cognitive control impairment in substance use disorder, with potential links to aberrant brain function in cognitive control areas such as the anterior cingulate cortex.
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Affiliation(s)
- Ryan M. Sullivan
- Department of Psychiatry, Stony Brook University School of
Medicine
- Department of Psychology, University of
Wisconsin-Milwaukee
| | - Greg Perlman
- Department of Psychiatry, Stony Brook University School of
Medicine
| | - Scott J. Moeller
- Department of Psychiatry, Stony Brook University School of
Medicine
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4
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Spronk DB, De Bruijn ERA, van Wel JHP, Ramaekers JG, Verkes RJ. Acute effects of cocaine and cannabis on response inhibition in humans: an ERP investigation. Addict Biol 2016; 21:1186-1198. [PMID: 26037156 DOI: 10.1111/adb.12274] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Substance abuse has often been associated with alterations in response inhibition in humans. Not much research has examined how the acute effects of drugs modify the neurophysiological correlates of response inhibition, or how these effects interact with individual variation in trait levels of impulsivity and novelty seeking. This study investigated the effects of cocaine and cannabis on behavioural and event-related potential (ERP) correlates of response inhibition in 38 healthy drug using volunteers. A double-blind placebo-controlled randomized three-way crossover design was used. All subjects completed a standard Go/NoGo task after administration of the drugs. Compared with a placebo, cocaine yielded improved accuracy, quicker reaction times and an increased prefrontal NoGo-P3 ERP. Cannabis produced opposing results; slower reaction times, impaired accuracy and a reduction in the amplitude of the prefrontal NoGo-P3. Cannabis in addition decreased the amplitude of the parietally recorded P3, while cocaine did not affect this. Neither drugs specifically affected the N2 component, suggesting that pre-motor response inhibitory processes remain unaffected. Neither trait impulsivity nor novelty seeking interacted with drug-induced effects on measures of response inhibition. We conclude that acute drug effects on response inhibition seem to be specific to the later, evaluative stages of response inhibition. The acute effects of cannabis appeared less specific to response inhibition than those of cocaine. Together, the results show that the behavioural effects on response inhibition are reflected in electrophysiological correlates. This study did not support a substantial role of vulnerability personality traits in the acute intoxication stage.
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Affiliation(s)
- Desirée B. Spronk
- Department of Psychiatry; Radboud University Medical Centre; Nijmegen The Netherlands
- Donders Institute for Brain, Cognition and Behaviour; Radboud University Nijmegen; Nijmegen The Netherlands
| | - Ellen R. A. De Bruijn
- Department of Clinical Psychology, Leiden Institute for Brain and Cognition; Leiden University; Leiden The Netherlands
| | - Janelle H. P. van Wel
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience; Maastricht University; Maastricht The Netherlands
| | - Johannes G. Ramaekers
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience; Maastricht University; Maastricht The Netherlands
| | - Robbert J. Verkes
- Department of Psychiatry; Radboud University Medical Centre; Nijmegen The Netherlands
- Donders Institute for Brain, Cognition and Behaviour; Radboud University Nijmegen; Nijmegen The Netherlands
- Pompestichting for Forensic Psychiatry; Nijmegen The Netherlands
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5
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Spronk DB, Verkes RJ, Cools R, Franke B, Van Wel JHP, Ramaekers JG, De Bruijn ERA. Opposite effects of cannabis and cocaine on performance monitoring. Eur Neuropsychopharmacol 2016; 26:1127-39. [PMID: 27106715 DOI: 10.1016/j.euroneuro.2016.03.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 12/16/2015] [Accepted: 03/24/2016] [Indexed: 01/10/2023]
Abstract
Drug use is often associated with risky and unsafe behavior. However, the acute effects of cocaine and cannabis on performance monitoring processes have not been systematically investigated. The aim of the current study was to investigate how administration of these drugs alters performance monitoring processes, as reflected in the error-related negativity (ERN), the error positivity (Pe) and post-error slowing. A double-blind placebo-controlled randomized three-way crossover design was used. Sixty-one subjects completed a Flanker task while EEG measures were obtained. Subjects showed diminished ERN and Pe amplitudes after cannabis administration and increased ERN and Pe amplitudes after administration of cocaine. Neither drug affected post-error slowing. These results demonstrate diametrically opposing effects on the early and late phases of performance monitoring of the two most commonly used illicit drugs of abuse. Conversely, the behavioral adaptation phase of performance monitoring remained unaltered by the drugs.
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Affiliation(s)
- Desirée B Spronk
- Department of Psychiatry, Radboud University Medical Center, 6500 HB Nijmegen, The Netherlands; Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6500 GL Nijmegen, The Netherlands.
| | - Robbert J Verkes
- Department of Psychiatry, Radboud University Medical Center, 6500 HB Nijmegen, The Netherlands; Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6500 GL Nijmegen, The Netherlands; Pompestichting for Forensic Psychiatry, 6532 CN Nijmegen, The Netherlands; Department of Criminal Law & Criminology, Radboud University, 6500 KK Nijmegen, The Netherlands
| | - Roshan Cools
- Department of Psychiatry, Radboud University Medical Center, 6500 HB Nijmegen, The Netherlands; Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6500 GL Nijmegen, The Netherlands
| | - Barbara Franke
- Department of Psychiatry, Radboud University Medical Center, 6500 HB Nijmegen, The Netherlands; Donders Institute for Brain, Cognition and Behaviour, Radboud University, 6500 GL Nijmegen, The Netherlands; Department of Human Genetics, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Janelle H P Van Wel
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience, Maastricht University, 6211 LK Maastricht, The Netherlands
| | - Johannes G Ramaekers
- Department of Neuropsychology and Psychopharmacology, Faculty of Psychology and Neuroscience, Maastricht University, 6211 LK Maastricht, The Netherlands
| | - Ellen R A De Bruijn
- Department of Clinical Psychology, Leiden Institute for Brain and Cognition, Leiden University, 2333 AK Leiden, The Netherlands
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6
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Dose-dependent effects of cannabis on the neural correlates of error monitoring in frequent cannabis users. Eur Neuropsychopharmacol 2015; 25:1943-53. [PMID: 26298832 DOI: 10.1016/j.euroneuro.2015.08.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 06/18/2015] [Accepted: 08/03/2015] [Indexed: 01/10/2023]
Abstract
Cannabis has been suggested to impair the capacity to recognize discrepancies between expected and executed actions. However, there is a lack of conclusive evidence regarding the acute impact of cannabis on the neural correlates of error monitoring. In order to contribute to the available knowledge, we used a randomized, double-blind, between-groups design to investigate the impact of administration of a low (5.5 mg THC) or high (22 mg THC) dose of vaporized cannabis vs. placebo on the amplitudes of the error-related negativity (ERN) and error positivity (Pe) in the context of the Flanker task, in a group of frequent cannabis users (required to use cannabis minimally 4 times a week, for at least 2 years). Subjects in the high dose group (n=18) demonstrated a significantly diminished ERN in comparison to the placebo condition (n=19), whereas a reduced Pe amplitude was observed in both the high and low dose (n=18) conditions, as compared to placebo. The results suggest that a high dose of cannabis may affect the neural correlates of both the conscious (late), as well as the initial automatic processes involved in error monitoring, while a low dose of cannabis might impact only the conscious (late) processing of errors.
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7
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Carey SE, Nestor L, Jones J, Garavan H, Hester R. Impaired learning from errors in cannabis users: Dorsal anterior cingulate cortex and hippocampus hypoactivity. Drug Alcohol Depend 2015; 155:175-82. [PMID: 26249266 PMCID: PMC4581978 DOI: 10.1016/j.drugalcdep.2015.07.671] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 06/23/2015] [Accepted: 07/24/2015] [Indexed: 11/28/2022]
Abstract
BACKGROUND The chronic use of cannabis has been associated with error processing dysfunction, in particular, hypoactivity in the dorsal anterior cingulate cortex (dACC) during the processing of cognitive errors. Given the role of such activity in influencing post-error adaptive behaviour, we hypothesised that chronic cannabis users would have significantly poorer learning from errors. METHODS Fifteen chronic cannabis users (four females, mean age=22.40 years, SD=4.29) and 15 control participants (two females, mean age=23.27 years, SD=3.67) were administered a paired associate learning task that enabled participants to learn from their errors, during fMRI data collection. RESULTS Compared with controls, chronic cannabis users showed (i) a lower recall error-correction rate and (ii) hypoactivity in the dACC and left hippocampus during the processing of error-related feedback and re-encoding of the correct response. The difference in error-related dACC activation between cannabis users and healthy controls varied as a function of error type, with the control group showing a significantly greater difference between corrected and repeated errors than the cannabis group. CONCLUSIONS The present results suggest that chronic cannabis users have poorer learning from errors, with the failure to adapt performance associated with hypoactivity in error-related dACC and hippocampal regions. The findings highlight a consequence of performance monitoring dysfunction in drug abuse and the potential consequence this cognitive impairment has for the symptom of failing to learn from negative feedback seen in cannabis and other forms of dependence.
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Affiliation(s)
- Susan E Carey
- School of Psychological Sciences, University of Melbourne, Melbourne, Victoria, Australia
| | - Liam Nestor
- School of Psychology and Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland
| | - Jennifer Jones
- School of Psychology and Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland
| | - Hugh Garavan
- School of Psychology and Trinity College Institute of Neuroscience, Trinity College Dublin, Dublin, Ireland,Departments of Psychiatry and Psychology, University of Vermont, USA
| | - Robert Hester
- School of Psychological Sciences, University of Melbourne, Melbourne, Victoria, Australia.
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8
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Morsel AM, Morrens M, Temmerman A, Sabbe B, de Bruijn ERA. Electrophysiological (EEG) evidence for reduced performance monitoring in euthymic bipolar disorder. Bipolar Disord 2014; 16:820-9. [PMID: 25219677 DOI: 10.1111/bdi.12256] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Accepted: 05/16/2014] [Indexed: 11/28/2022]
Abstract
OBJECTIVES Apart from mood episodes, many cognitive deficits are present in bipolar disorder (BD). Performance monitoring is an important aspect of executive functioning and involves continuous monitoring of behavior and making subsequent changes when an error is made. On a neurophysiological level, the error-related negativity (ERN), an event-related brain potential (ERP) generated in the anterior cingulate cortex (ACC), reflects this process of performance monitoring. Abnormal ERN amplitudes have been observed in many major psychiatric disorders. However, despite conflicting evidence regarding the role of the ACC in BD, no studies to date have investigated performance monitoring as reflected in the ERN in BD. METHODS Sixteen patients with BD in a euthymic state and 14 matched healthy controls performed a speeded two-choice reaction-time paradigm (Flankers Task) while electroencephalogram (EEG) measures were obtained. Behavioral and ERP measurements were analyzed for the two groups. RESULTS The patients with BD, although euthymic, scored higher on depressive symptoms than healthy controls. While no behavioral group differences were found, patients with BD displayed lower ERN amplitudes than healthy controls when controlling for effects of residual mood. CONCLUSIONS The lower ERN amplitudes in the BD group reflect reduced performance monitoring and extend current knowledge of executive functioning in BD. Importantly, these findings go a long way to resolving the contradictory results regarding ACC involvement in BD by showing that taking into account residual mood may greatly influence error-related ACC activations and is critically important in understanding cognitive deficits in BD.
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Affiliation(s)
- Anne M Morsel
- Collaborative Antwerp Psychiatric Research Institute (CAPRI), University of Antwerp, Antwerp
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9
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The acute effects of MDMA and ethanol administration on electrophysiological correlates of performance monitoring in healthy volunteers. Psychopharmacology (Berl) 2014; 231:2877-88. [PMID: 24770624 DOI: 10.1007/s00213-014-3456-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 01/15/2014] [Indexed: 10/25/2022]
Abstract
RATIONALE Knowing how commonly used drugs affect performance monitoring is of great importance, because drug use is often associated with compromised behavioral control. Two of the most commonly used recreational drugs in the western world, 3,4-methylenedioxymethamphetamine (MDMA or "ecstasy") and ethanol (alcohol), are also often used in combination. The error-related negativity (ERN), correct-related negativity (CRN), and N2 are electrophysiological indices of performance monitoring. OBJECTIVES The present study aimed to investigate how ethanol, MDMA, and their co-administration affect performance monitoring as indexed by the electrophysiological correlates. METHODS Behavioral and EEG data were obtained from 14 healthy volunteers during execution of a speeded choice-reaction-time task after administration of ethanol, MDMA, and combined ethanol and MDMA, in a double-blind, placebo-controlled, randomized crossover design. RESULTS Ethanol significantly reduced ERN amplitudes, while administration of MDMA did not affect the ERN. Co-administration of MDMA and ethanol did not further impair nor ameliorate the effect of ethanol alone. No drug effects on CRN nor N2 were observed. DISCUSSION A decreased ERN following ethanol administration is in line with previous work and offers further support for the impairing effects of alcohol intoxication on performance monitoring. This impairment may underlie maladaptive behavior in people who are under influence. Moreover, these data demonstrate for the first time that MDMA does not affect performance monitoring nor does it interact with ethanol in this process. These findings corroborate the notion that MDMA leaves central executive functions relatively unaffected.
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10
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Wilkinson ST, Radhakrishnan R, D'Souza DC. Impact of Cannabis Use on the Development of Psychotic Disorders. CURRENT ADDICTION REPORTS 2014; 1:115-128. [PMID: 25767748 DOI: 10.1007/s40429-014-0018-7] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The link between cannabis use and psychosis comprises three distinct relationships: acute psychosis associated with cannabis intoxication, acute psychosis that lasts beyond the period of acute intoxication, and persistent psychosis not time-locked to exposure. Experimental studies reveal that cannabis, tetrahydrocannabinol (THC) and synthetic cannabinoids reliably produce transient positive, negative, and cognitive symptoms in healthy volunteers. Case-studies indicate that cannabinoids can induce acute psychosis which lasts beyond the period of acute intoxication but resolves within a month. Exposure to cannabis in adolescence is associated with a risk for later psychotic disorder in adulthood; this association is consistent, temporally related, shows a dose-response, and is biologically plausible. However, cannabis is neither necessary nor sufficient to cause a persistent psychotic disorder. More likely it is a component cause that interacts with other factors to result in psychosis. The link between cannabis and psychosis is moderated by age at onset of cannabis use, childhood abuse and genetic vulnerability. While more research is needed to better characterize the relationship between cannabinoid use and the onset and persistence of psychosis, clinicians should be mindful of the potential risk of psychosis especially in vulnerable populations, including adolescents and those with a psychosis diathesis.
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Affiliation(s)
- Samuel T Wilkinson
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Rajiv Radhakrishnan
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Deepak Cyril D'Souza
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA ; Abraham Ribicoff Research Facilities, Connecticut Mental Health Center, New Haven, CT, USA ; Schizophrenia and Neuropharmacology Research Group, VA Connecticut Healthcare System, West Haven, CT, USA
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11
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Rosch KS, Hawk LW. The effects of performance-based rewards on neurophysiological correlates of stimulus, error, and feedback processing in children with ADHD. Psychophysiology 2013; 50:1157-73. [PMID: 24033316 PMCID: PMC3807761 DOI: 10.1111/psyp.12127] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Accepted: 06/16/2013] [Indexed: 11/29/2022]
Abstract
Rewards have been shown to improve behavior and cognitive processes implicated in attention-deficit hyperactivity disorder (ADHD), but the information-processing mechanisms by which these improvements occur remain unclear. We examined the effect of performance-based rewards on ERPs related to processing of the primary task stimuli, errors, and feedback in children with ADHD and typically developing controls. Participants completed a flanker task containing blocks with and without performance-based rewards. Children with ADHD showed reduced amplitude of ERPs associated with processing of the flanker stimuli (P3) and errors (ERN, Pe), but did not differ in feedback-processing (FRN). Rewards enhanced flanker-related P3 amplitude similarly across groups and error-related Pe amplitude differentially for children with ADHD. These findings suggest that rewards may improve cognitive deficits in children with ADHD through enhanced processing of relevant stimuli and increased error evaluation.
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Affiliation(s)
- Keri Shiels Rosch
- Department of Psychology, University at Buffalo, Buffalo, New York, USA
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12
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Schlienz NJ, Hawk LW, Rosch KS. The effects of acute abstinence from smoking and performance-based rewards on performance monitoring. Psychopharmacology (Berl) 2013; 229:701-11. [PMID: 23681159 PMCID: PMC3784636 DOI: 10.1007/s00213-013-3131-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2012] [Accepted: 04/28/2013] [Indexed: 11/25/2022]
Abstract
RATIONALE Abstinence from smoking disrupts performance in multiple cognitive domains, and such cognitive effects may serve to maintain smoking behavior. Rather than having specific effects on a narrow domain of processing, abstinence may disrupt more general cognitive control processes and/or motivation. OBJECTIVES The present study tested the prediction that overnight abstinence from smoking would disrupt a general performance monitoring system indexed via the error-related negativity (ERN). A secondary aim was to determine the extent to which performance-based monetary rewards improved the ERN among smokers and whether the effect of the reward was diminished during abstinence. METHODS The ERN was assessed during a flanker task among 25 heavy, non-treatment-seeking smokers both when smoking as usual and after overnight abstinence; reward and no-reward trial blocks occurred within each session. RESULTS As predicted, mean ERN amplitude was reduced during abstinence. The ERN was enhanced by reward; this effect did not vary with smoking abstinence. CONCLUSION This study provides novel data which suggest that acute abstinence from smoking disrupts a neurophysiological index of a general performance monitoring system that is involved in a range of cognitive functions. The ERN may be a useful complement to narrow-band cognitive studies of abstinence and interventions designed to target cognition in addiction. Because the ERN was concurrently sensitive to abstinence and performance-based incentives, it may be particularly useful for examining the interplay of cognition and motivation in smoking and smoking cessation.
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Affiliation(s)
| | - Larry W. Hawk
- Department of Psychology, State University of New York at Buffalo,Center for Children and Families, State University of New York at Buffalo
| | - Keri S. Rosch
- Department of Psychology, State University of New York at Buffalo
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13
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Fridberg DJ, Skosnik PD, Hetrick WP, O’Donnell BF. Neural correlates of performance monitoring in chronic cannabis users and cannabis-naive controls. J Psychopharmacol 2013; 27:515-25. [PMID: 23427191 PMCID: PMC3923357 DOI: 10.1177/0269881113477745] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Chronic cannabis use is associated with residual negative effects on measures of executive functioning. However, little previous work has focused specifically on executive processes involved in performance monitoring in frequent cannabis users. The present study investigated event-related potential (ERP) correlates of performance monitoring in chronic cannabis users. The error-related negativity (ERN) and error positivity (Pe), ERPs sensitive to performance monitoring, were recorded from 30 frequent cannabis users (mean usage=5.52 days/week) and 32 cannabis-naïve control participants during a speeded stimulus discrimination task. The "oddball" P3 ERP was recorded as well. Users and controls did not differ on the amplitude or latency of the ERN; however, Pe amplitude was larger among users. Users also showed increased amplitude and reduced latency of the P3 in response to infrequent stimuli presented during the task. Among users, urinary cannabinoid metabolite levels at testing were unrelated to ERP outcomes. However, total years of cannabis use correlated negatively with P3 latency and positively with P3 amplitude, and age of first cannabis use correlated negatively with P3 amplitude. The results of this study suggest that chronic cannabis use is associated with alterations in neural activity related to the processing of motivationally-relevant stimuli (P3) and errors (Pe).
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Affiliation(s)
- Daniel J Fridberg
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, IN 47405, USA.
| | - Patrick D Skosnik
- Department of Psychiatry, Yale University School of Medicine, New Haven, USA
| | - William P Hetrick
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, USA,Department of Psychiatry, Indiana University School of Medicine, Indianapolis, USA
| | - Brian F O’Donnell
- Department of Psychological and Brain Sciences, Indiana University, Bloomington, USA,Department of Psychiatry, Indiana University School of Medicine, Indianapolis, USA
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Kowal MA, Hazekamp A, Colzato LS, van Steenbergen H, Hommel B. Modulation of cognitive and emotional processing by cannabidiol: the role of the anterior cingulate cortex. Front Hum Neurosci 2013; 7:147. [PMID: 23616760 PMCID: PMC3629308 DOI: 10.3389/fnhum.2013.00147] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2013] [Accepted: 04/04/2013] [Indexed: 12/22/2022] Open
Affiliation(s)
- Mikael A Kowal
- Cognitive Psychology Unit, Leiden Institute for Brain and Cognition, Leiden University Leiden, Netherlands
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15
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Campolongo P, Trezza V. The endocannabinoid system: a key modulator of emotions and cognition. Front Behav Neurosci 2012; 6:73. [PMID: 23133409 PMCID: PMC3490098 DOI: 10.3389/fnbeh.2012.00073] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 10/18/2012] [Indexed: 11/13/2022] Open
Affiliation(s)
- Patrizia Campolongo
- Department of Physiology and Pharmacology, University of Rome Sapienza Rome, Italy
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