Experimental and clinical psychopharmacology最新文献

Delay discounting refers to the devaluation of an outcome as temporal delay increases. Steep discounting is characterized by preferring a smaller, immediate outcome over a larger, delayed outcome and is associated with maladaptive behaviors such as tobacco use. Previous studies have compared delay discounting outcomes between combustible cigarette (CC) smokers and nonusers using various discounting tasks. With the growing use of electronic cigarettes (e-cigarettes [EC]) and various delay discounting tasks available to researchers, we extended previous work in delay discounting and EC use in two ways. The present study assessed delay discounting in a web-based sample of 259 participants to (a) establish convergent validity across four different delay discounting tasks and (b) compare the outcomes between four subgroups: dual users, exclusive EC users, exclusive CC users, and nonusers. The four delay discounting tasks (Monetary Choice Questionnaire, 5-Trial Adjusting Delay Discounting Task [ADT-5], Temporal Discounting Questionnaire, and Brief Intertemporal Choice Task [BRIC Task]) showed moderate to strong convergent validity (p < .001). Further, findings indicated significant differences between all four subgroups across the four different delay discounting tasks (p < .048) with small effect sizes. Pairwise comparisons showed that exclusive EC users exhibited significantly steeper discounting than nonusers in ADT-5 (p = .043) and BRIC Task (p = .029) and dual users exhibited significantly steeper discounting than nonusers on ADT-5 (p = .043) and BRIC Task (p = .030). Our findings replicate previous findings and suggest the potential role of delay discounting in explaining the behavioral mechanism underlying e-cigarette use. (PsycInfo Database Record (c) 2025 APA, all rights reserved).

Although crowdsourcing platforms are widely used in substance-use research, it is unclear what percentage of participants use substances at the time of participation and how this might affect data quality, behavioral outcomes, or decision making. We conducted a secondary analysis of data collected on MTurk for a two-session, within-subject experiment recruiting individuals who regularly use alcohol, cannabis, cigarettes, or opioids. We analyzed 527 observations collected across two sessions (Session 1: n = 303, Session 2: n = 224) on measures of substance use before (within 3 hr)/during participation, data quality, demand in hypothetical purchase tasks, delay discounting, and craving. Substance use before/during participation was common (35.7%). Some participants reported substance use before/during both (25.4%) or only one (20.1%) of the sessions. Between-subject analyses of the first session data revealed that participants who used substances before/during participation did not differ on quality measures yet were slower to complete the survey. Controlling for individual differences in demographic variables and typical substance use, using a substance before/during participation was associated with increased hypothetical consumption of substances when the substance was free (demand intensity) and higher craving for substances, but not delay discounting. Substance use before/during MTurk participation among individuals who regularly use substances is prevalent and may impact outcome measures or standardization across sessions in repeated measures designs. Several implications have emerged, including statistically or experimentally controlling for substance use occurring before/during participation, which could improve the validity and rigor of online substance use research, and should be considered a part of best practices. (PsycInfo Database Record (c) 2025 APA, all rights reserved).

Hypothetical purchase tasks offer effective and efficient methods to assess the reinforcing value of various substances, including cigarettes. The purpose of the present study is to examine the validity and reliability of the Cigarette Purchase Task (CPT) in an experimental arrangement in which participants were receiving free cigarettes. Critical to the validity of the CPT is that those who smoke can accurately estimate how much they would smoke under varying economic constraints. Participants (N = 9) were provided free study cigarettes for 8 weeks. Participants completed the CPT once weekly. To examine the validity of the five CPT demand indices (i.e., demand intensity, P_max, O_max, breakpoint, and α), we used a simple linear regression stratified by session number to model which of the five CPT demand indices were associated with the number of cigarettes smoked per day during Week 1 of the experiment. Significant associations in the hypothesized direction were noted across the five CPT indices, with the evidence for validity greatest for intensity, followed by O_max, P_max, breakpoint, and α. To examine CPT test-retest reliability, we estimated interclass correlation coefficients between Sessions 1 and 4 and Sessions 5 and 8. All but one interclass correlation coefficient supported "good" or "excellent" reliability, with the only exception seen with the α index between Sessions 1 and 4, which was moderate reliability. Collectively, these results provide evidence supporting the construct validity and temporal stability/reliability of the CPT demand indices under conditions of limited economic constraint. (PsycInfo Database Record (c) 2025 APA, all rights reserved).

Cocaine use disorder (CUD) is a major public health issue, and greater cocaine use severity has been associated with worse treatment retention and outcomes. Therefore, greater understanding of processes that influence cocaine use is needed. Both anhedonia (i.e., undervaluation of nondrug rewards) and cocaine demand (i.e., cocaine valuation) are related to cocaine use severity and thematically related to each other at face value, but no studies have directly compared these outcomes to our knowledge. The present study represents a secondary analysis from a two-phase sequential, multiple assignment, randomized trial aimed at developing adaptive interventions for CUD. We examined the relationship between anhedonia and cocaine demand and how these measures were related to cocaine use severity. Participants (N = 116) were treatment-seeking adults with CUD. All measures were taken at baseline before treatment initiation. Analyses revealed (a) moderate and very strong evidence of relationships between cocaine demand factors (i.e., persistence, amplitude) and anhedonia (PP values ≥ 77.8%); (b) positive association between cocaine demand (both persistence and amplitude) and measures of cocaine use severity, with the exception of one relationship, which was in the opposite direction; and (c) demand amplitude continued to be positively related to cocaine use severity, even when considering anhedonia. Overall, findings from this study indicate cocaine demand relates to cocaine use severity more strongly than anhedonia. (PsycInfo Database Record (c) 2025 APA, all rights reserved).

The role of craving in opioid use disorder (OUD) has been well established with respect to heroin but less so with prescription opioids. This pilot study, conducted in 18 treatment-seeking patients with prescription OUD and 18 healthy volunteers, assessed spontaneous (in the moment) and cue-induced craving and their relationship to depression and anxiety. Patients (vs. healthy volunteers) exhibited increased spontaneous craving for prescription opioids. Relative to brief (10 s) random presentations of neutral and affective images, presented drug (prescription opioids) images elicited greater craving ratings in patients and were associated with higher valence and arousal ratings. Elevated depression and anxiety observed in patients (vs. healthy volunteers) were positively associated with spontaneous and cue-induced cravings. These findings tentatively support a role for drug craving and mental health comorbidity in prescription OUD and underscore the need for additional research to understand their causal relationships and their interactive dynamics during treatment and recurrence. (PsycInfo Database Record (c) 2025 APA, all rights reserved).

Treating substance use disorders is difficult as individuals often resume substance use during abstinence. One potential factor contributing to the recurrence of substance use is incubation of drug craving. Specifically, individuals report higher levels of craving when presented with drug-paired stimuli across abstinence, although this effect is largely absent in opioid-dependent individuals. In preclinical studies, rodents show increased responding on a previously reinforced manipulandum when presented with drug cues, including for opioids. When proximal cues are not presented, self-reported craving tends to decrease across abstinence; however, incubation of drug seeking in the absence of proximal stimuli is rarely tested in animals. As such, we trained male and female Sprague Dawley rats to self-administer the synthetic opioid fentanyl (2.5 μg/kg/infusion) during ten 60-min sessions. Rats were then given three extinction sessions on Days 1, 21, and 30 of withdrawal. Unlike other studies measuring incubation of craving, we did not present drug-paired stimuli (e.g., stimulus lights) during these extinction sessions. Incubation of fentanyl seeking was not observed in the present experiment; instead, responses on the previously drug-paired lever tended to decrease across the three extinction sessions. Based on the results of this experiment, we provide a discussion of some potential interpretational issues associated with the incubation of craving paradigm, including the difficulty in dissociating drug craving from operant sensation seeking (i.e., rodents will respond on a manipulandum to earn access to audiovisual cues that are presented alone). (PsycInfo Database Record (c) 2025 APA, all rights reserved).

Alcohol-impaired driving is highly prevalent and a leading cause of death. Cannabis is commonly used among people who drink alcohol, and using alcohol and cannabis simultaneously is associated with a greater frequency of alcohol-impaired driving. Laboratory studies demonstrate the harmful effects of simultaneous use on driving ability compared to alcohol use alone, yet driving under the influence of cannabis is perceived as a low risk. We tested the influences of alcohol, cannabis, and their simultaneous use on perceived driving impairment and willingness to drive in daily life. Participants were 88 adults aged 18-44 (M_age = 25.22 years, 60.2% female, 85.2% White) who reported using alcohol and cannabis simultaneously at least twice per week. They completed 14 days of ecological momentary assessment and reported their alcohol and cannabis use, perceived driving impairment, and willingness to drive "right now" and "1 hr from now" on an average of 5.14 surveys per day. Adjusting for the total amount of alcohol consumed, results from multilevel models include greater perceived driving impairment when using alcohol (b = 0.39, SE = 0.05, p < .001) and cannabis (b = 0.37, SE = 0.03, p < .001) separately, but greater odds of being willing to drive right now (OR = 2.29, 95% CI [1.38, 3.81], p = .001) and in 1 hr (OR = 3.69, 95% CI [2.15, 6.34], p < .001) when using alcohol and cannabis simultaneously compared to using alcohol by itself. Simultaneous use of cannabis may attenuate the impact of alcohol on the decision to drive and may contribute harmfully to in-the-moment decisions to drive under the influence of alcohol. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Alcohol use disorder is prevalent, and various risk factors inform drinking onset and drinking patterns. Existing data suggest that alcohol sweet taste preference may be associated with harmful levels of alcohol use and alcohol-related harm. The present exploratory study aimed to characterize people's first alcohol use experience, probe the association between sweet taste preferences and drinking patterns over time, and evaluate the relationship between sweet taste preferences and behavioral economic variables. Participants (N = 277) were recruited through Prolific and completed an assessment of first alcohol exposure, current and historic drinking patterns, alcohol demand, and delay discounting. Participants reporting preference for less sweet alcohol beverages consumed the most drinks per week both currently and during their period of the heaviest use. Trends emerged such that rank order decreases in alcohol consumption were observed from those reporting transitioning from sweet to less sweet preference, then less sweet to sweet preference, and finally consistent sweet taste preference reporting the lowest consumption. Similar associations were observed for alcohol use disorder symptoms counts and alcohol demand intensity. These data broadly suggest that sweet taste preferences in alcohol consumption may serve as an important factor modulating patterns of alcohol use across the lifespan. In terms of translational implications, these data suggest that commonly used sucrose fades in preclinical research may reflect the trend in taste preferences of the majority of the population but do not mirror the typical onset (or course) of chronic, maladaptive drinking behaviors. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Oral nicotine pouches (ONPs) are an emergent class of tobacco products that, unlike conventional oral smokeless tobacco products, contain a nicotine powder instead of tobacco leaves. This review synthesizes available data on ONPs in key research domains including survey studies, marketing/advertising studies, chemical characterization and in vitro studies, and clinical studies. Research findings relevant for ONP regulations are summarized, including who uses these products and why, how marketing tactics influence appeal and use intentions, what harmful and potentially harmful constituents they contain, and what acute effects they have on humans. Taken together, the current data suggest that ONPs likely produce less harm to individual users than conventional tobacco products (e.g., moist snuff, cigarettes) and can acutely suppress nicotine/tobacco withdrawal symptoms among current cigarette smokers. Thus, ONPs may be a viable harm reduction option for individuals who switch completely to using them from conventional products. However, randomized controlled trials are needed to determine if established tobacco users would use ONPs long term, and more independent academic research is needed given that most ONP studies to date are tobacco industry-funded. Additionally, ONPs have qualities (e.g., flavors, marketing claims of "tobacco free") that could increase appeal among youth and young adults, and these products can deliver nicotine at levels sufficient to cause dependence; widespread adoption of ONPs among otherwise nicotine-naive individuals may reduce their net public health benefit. This review concludes by suggesting future research directions necessary to increase scientific understanding of ONPs and inform regulations for these increasingly popular products. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Black Americans who use cannabis appear at greater risk for negative cannabis-related outcomes, and cannabis use is more common among individuals who smoke cigarettes. Race-based health disparities concerning cannabis outcomes indicate a need to identify psycho-socio-cultural factors that may play a role in cannabis use and related problems among Black Americans to inform prevention and treatment efforts. Minority stress-based models posit that stressors such as racism increase negative emotions, which may be associated with using substances such as cannabis to cope with negative emotions. Yet, no known research has directly assessed whether negative emotions experienced in response to racism play a role in cannabis-related behaviors. Participants were 254 (50.2% female) Black Americans who endorsed current cigarette smoking and were aged 18-73 (M = 42.1, SD = 14.1). Participants completed an online survey regarding their experiences with racism, smoking, and cannabis-related behaviors. Negative emotions in response to racism were assessed via the Racial Trauma Scale (RTS). Experiencing more frequent racism was related to greater RTS and cannabis-related problems. When entered simultaneously, frequency of racism was related to more cannabis-related problems via RTS, but not anxiety or depression broadly. Racism was related to more cannabis problems via the sequential effects of RTS and a greater quantity of cannabis used. These data indicate that the experience of negative emotions that occur after experiencing racism may play an important role in cannabis misuse among Black Americans. (PsycInfo Database Record (c) 2024 APA, all rights reserved).