The present study investigated how knowledge of tonality is used in sight-reading by comparing sight-reading accuracy across three tonal constructs: major, minor and atonal. It was hypothesized that sight-reading performance would be the worst in instances with no tonal information, as participants would be unable to generate appropriate top-down expectancies to guide their sight-reading. To test this, twelve pianists sight-read major, minor and atonal versions of monophonic, homophonic and polyphonic excerpts. The results indicated that pianists performed the major excerpts with greater accuracy than the atonal excerpts. Furthermore, the errors made within the major excerpts were significantly biased towards diatonicism, and there was a global shift towards tonality in participants’ atonal performances, providing a clear demonstration of how pianists’ expectations might have contributed to their sight-reading performance. The diatonic bias was not found in the minor excerpts, suggesting that the minor hierarchy does exert as strong of an influence during sight-reading.

One of the most interesting aspects of human beings is their ability to choose a course of action and strive to achieve it. When participating in therapeutic interventions involving physical activities, people may allocate different amounts of effort, persistence and commitment to succeed in them. The reason for this difference lies in their motivation. The present thesis focuses on the energising of behaviour, that is, the differential effort and motivation that people put into therapeutic activities. Placebo responses are generally explained by the mechanisms of response expectancy, conditioning and motivational concordance. Findings presented in this thesis partially supported motivational concordance, testing for the first time that therapeutic outcome after engagement in intrinsically motivated tasks requiring physical activity was explained both by response expectancy and motivational concordance . The effects of response expectancy, perceptions of effort and intrinsic motivation on therapeutic benefit and mood change were investigated in both laboratory (Studies 1-4) and real-life therapeutic contexts (Study 5). Study 1 showed that effort mediated the effects of expectancy on perceived benefit, and effort predicted both positive and negative affect following the performance of a breathing exercise. Study 2 showed that differences in outcome between guided imagery and meditation were very small, but that non-specific factors play the major role in outcome. Study 3 showed that perceiving a task as difficult enhances effort perceptions, intrinsic motivation and therapeutic outcome. Motivated behaviour predicted therapeutic outcome but not expectancy. Study 4 showed that the provision of success feedback enhances outcome expectancies, motivated behaviour and mood change. Expectancies, motivation and effort predicted positive affect, whereas only effort predicted negative affect. Finally, results from Study 5 suggest that placebo responses may differ in real-life therapeutic interventions according to the strength motivational factors are elicited within the intervention. Both expectancy and motivated behaviour predicted change in positive affect, whereas motivated behaviour predicted change in negative affect and empowerment. Therapeutic outcome and its underlying mechanisms are likely to reflect a mixture of response expectancies and intervening motivational factors.

Nearly half of all youths experience a mental health disorder at some point during childhood (Merikangas et al., 2010). Pediatric psychopathology is associated with a substantial amount of impairment in the school, social, and home domains, and such symptoms can have adverse impacts on subsequent development (Beauchaine & Hinshaw, 2013; Patel, Flisher, Hetrick, & McGorry, 2007). Fortunately, a number of medications have demonstrated efficacy in treating a number of mental health conditions (Martin, Scahill, & Kratochvil, 2010). Despite these demonstrated effects, treatment response is often incomplete, and the mechanisms by which pharmacotherapy lead to behavior change are not well understood. However, research in pediatric psychopharmacology has often not considered the role of psychosocial variables, despite their promise to explain much variance in psychiatric outcomes and the robust influence they have demonstrated in psychotherapy-based behavior change (e.g., Shirk & Karver, 2011). This study investigated the role of four psychosocial variables in treatment outcome in pediatric psychiatric practice: medication adherence, therapeutic alliance, motivation for behavior change, and expectancies for positive treatment outcome. Surprising patterns of effects were found, with psychosocial variables being associated with both decreases and increases in symptomology depending on the circumstance (e.g., externalizing behavior), and many inconsistencies were observed among these patterns. While psychosocial variables are often portrayed as having uniformly positive impacts on treatment, their role in pediatric psychiatry may not be as straightforward as is commonly depicted in other diseases and therapeutic approaches. In particular, the nature of their effects on outcome may vary across symptom presentations and intervention approaches. Based on these findings, recommendations for clinical practice and future research are discussed which affect all patients, researchers, and medical providers who participate in pediatric psychiatric treatment.

E-cigarette use has been increasing in recent years, and its ultimate public health impact is still unknown. In order to assess the addictive liability of these products, research is needed to investigate the roles of nicotine and other factors on psychological and physical effects of “vaping.” The goal of the current study was to investigate the role of expectancies, nicotine delivery, and their interactions on the effects of e-cigarette use via a balanced-placebo experiment. In this design, drug dosage (contains nicotine or not) was crossed with instructions (told nicotine or non-nicotine) during ad-lib e-cigarette use sessions by 128 current e-cigarette users. This design allows for parsing of the causal role of expectancies and pharmacology, as well as their interaction. Dependent variables included both psychological outcomes (cravings for cigarettes and e-cigarettes, mood, satisfaction, reward) and physiological variables (hunger, attention, aversion, respiratory tract sensations). Among cigarette smokers (n=52), a significant main effect of instruction emerged on reductions in craving to smoke, although moderation analyses revealed that this effect was limited to males. Overall, significant drug X instruction interactions were found on craving to vape, psychological reward, and enjoyment of respiratory tract sensations, indicating synergistic causal influences of both expectancies and nicotine. Expectancies, smoking status, and gender moderated some of these effects. The results of this study identified effects of e-cigarettes that were driven by either nicotine, cognitive drug expectancies, or both. Results should be considered in the context of methodological and theoretical limitations. This study contributes to the understanding of motivational influences that may affect the initiation and maintenance of e-cigarette use, which may guide the development of public health and clinical interventions.

Prior research found that female smokers with elevated dietary restraint (“high-restrainers”) smoked more after a disinhibiting food event (Kovacs, Correa, & Brandon, 2014). The current study aimed to determine if high-restrainers smoked merely to distract themselves from eating, or if the appetite/weight-control aspects of smoking played a role. Female smokers (N = 128) attended a laboratory session and were randomized to receive a milkshake prime (Prime condition) or not (No-Prime condition). All participants then received ad-lib access to tempting foods, cigarettes, and a computer tablet with internet access. Our main aims were to test the effect of the prime on smoking and eating behavior in the presence of an alternative distractor (i.e. the tablet). We expected high-restrainers in the Prime condition to demonstrate preference for cigarettes even in the presence of an alternative distractor. Primary analyses utilized hierarchical regression models with condition and several moderators as predictors of consumption behavior. Condition was predictive of total cigarette smoked (p’s<.02), indicating that those in the Prime condition smoked more. Regardless of condition, several expectancy measures predicted cigarette consumption (p’s < .05), and higher level of dietary restraint predicted shorter latency to smoke (p= .017). Additionally, lower levels of trait mindfulness were associated with elevated dietary restraint, cigarette craving at baseline and expectancies about cigarettes’ weight control properties. Importantly, latency to use the tablet was not predicted by level of dietary restraint or expectancies. Although dietary restraint and expectancies did not interact with condition to predict levels of smoking, the overall findings suggest that :1. The traditional priming effect was apparently mitigated in the presence of appealing distracting stimuli ;and 2. Dietary restrainers attempt to prevent food consumption by turning to cigarettes, choosing to utilize cigarettes above and beyond preference for other salient distracting stimuli. Therefore, smoking appears to be more than just a distractor from eating, and is also associated with strong beliefs about weight and appetite control. These findings may inform interventions aimed at the high-risk population of young adult female smokers, and mindfulness-based strategies may prove especially useful.

Over the last decade, electronic cigarettes (e-cigarettes) have emerged as novel and popular nicotine delivery devices. Although many smokers use e-cigarettes, evidence suggests these products are also growing in popularity among young adult non-smokers. It is therefore important to examine factors that may contribute to onset of electronic cigarette use among young adult non-smokers. Critics and supporters of electronic cigarettes have been disseminating anti and pro e-cigarette messages (respectively) and it is currently unclear what effect, if any, these messages exert on young adult non-smokers. Critics of electronic cigarettes advocate caution towards these products, while supporters of electronic cigarettes argue these products can serve as healthier replacements for conventional cigarettes. The present study sought to investigate the influence of caution and replacement messages on young adult non-smokers’ dispositions towards future e-cigarette use. Two hundred and four young-adult non-smokers participated in a between subjects single session design where they viewed one of three possible audiovisual presentations (a caution message, replacement message or control message). After viewing the presentation, participants completed measures and tasks assessing their likelihood of future e-cigarette use, including willingness and intention to try e-cigarettes, as well as a measure of e-cigarette outcome expectancies. Results indicated the caution message decreased self-reported willingness to use e-cigarettes and was associated with higher negative and lower positive e-cigarette expectancies. The replacement message did not influence self-reported willingness and intention to use e-cigarettes but was associated with decreases in negative e-cigarette expectancies. These findings suggest that public health e-cigarette messages could be developed to simultaneously advocate using e-cigarettes as a smoking alternative and caution against e-cigarette use for individuals not already dependent on nicotine.

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The present study was aimed at experimentally investigating effects of causal explanations for depression on treatment-seeking behavior and beliefs. Participants at a large Southern university (N = 139; 78% female; average age 19.77) received bogus screening results indicating high depression risk, then viewed an explanation of depression etiology (fixed biological vs. malleable) before receiving a treatment referral (antidepressant vs. psychotherapy). Participants accepted the cover story at face value, but some expressed doubts about the screening task’s ability to properly assess their individual depression. Within the skeptics, those given a fixed biological explanation for depression were relatively unwilling to accept either treatment, but those given a malleable explanation were much more willing to accept psychotherapy. Importantly, differences in skepticism were not due to levels of actual depressive symptoms. The present findings indicate that information about the malleability of depression may have a protective effect for persons who otherwise would not accept treatment.

The present investigation modeled the expectancy memory organization and likely memory activation patterns of marijuana expectancies of children across age and marijuana use. The first phase of the study surveyed 142 children to obtain their first associate to marijuana use. From their responses, the Marijuana Expectancy Inventory for Children and Adolescents (MEICA) was developed. The second phase of the study administered the MEICA to a second sample of 392 children to model marijuana expectancy organization and probable memory activation paths of marijuana users versus never-users. Results indicated that irrespective of age, adolescents who have used marijuana tend to emphasize positive-negative effects, whereas adolescents who have never used marijuana tend to emphasize psychological-physiological effects. Memory activation patterns also differed by marijuana use history such that users are more likely to begin their paths with short-term positive effects of marijuana, versus non-users who access long-term cognitive and physiological effects with more likelihood. This study is the first to examine specific marijuana outcome expectancies of children and adolescents as they relate to marijuana-using behavior. Implications for marijuana prevention and intervention programs, future research, and limitations of the current investigation are discussed.