Social and Behavioral Sciences Commons^™

Effect Of Reverberation Context On Spatial Hearing Performance Of Normally Hearing Listeners, Renita E. Sudirga

Electronic Thesis and Dissertation Repository

Previous studies provide evidence that listening experience in a particular reverberant environment improves speech intelligibility and localization performance in that environment. Such studies, however, are few, and there is little knowledge of the underlying mechanisms. The experiments presented in this thesis explored the effect of reverberation context, in particular, the similarity in interaural coherence within a context, on listeners' performance in sound localization, speech perception in a spatially separated noise, spatial release from speech-on-speech masking, and target location identification in a multi-talker configuration.

All experiments were conducted in simulated reverberant environments created with a loudspeaker array in an anechoic chamber. …

An Examination Of Psychological Variables Influencing Perceptions Of The Self Among A Sample Of Female Exercise Initiates, Lisa Cooke

Electronic Thesis and Dissertation Repository

The general purpose of this dissertation was to explore the relationship among and within cognitive variables associated with exercise initiation and maintenance in a sample of female exercise initiates.

Manuscript 1 was structured to explore the changes to exercise identity among a population of female exercise initiates (N = 78) grouped into an imagery or control condition. Previous research has found that a strong exercise identity is associated with more frequent exercise (Strachan et al., 2009) and increases over time as a person continues to exercise (Cardinal & Cardinal, 1997). Participants were assessed multiple times (weeks 0, 5, 9, …

The Effects Of Alcohol On Different Classes Of Motion Perception, Steven J. Matson

Electronic Thesis and Dissertation Repository

We used a psychophysical approach to investigate how alcohol affected visual sensitivity to perceive different classes of motion. Visual sensitivities were measured in both a non-alcohol and an alcohol condition for three classes of motion: Minimum Motion, Simple Motion, and Complex Motion. Perceptual thresholds, taken as the degree of motion at which an observer responded correctly with an accuracy of 75%, or Weber fractions were compared between the non-alcohol and the alcohol conditions. For Simple and Complex motion, similar comparisons were made as a function of speed (e.g., 2°s^-1, 6°s^-1, and 12°s^-1). Perceptual thresholds …

Enhancing Transparency Of The Research Process To Increase Accuracy Of Findings: A Guide For Relationship Researchers, Lorne Campbell, Timothy J. Loving, Etienne P. Lebel

Psychology Publications

The purpose of this paper is to extend to the field of relationship science, recent discussions and suggested changes in open research practises. We demonstrate different ways that greater transparency of the research process in our field will accelerate scientific progress by increasing accuracy of reported research findings. Importantly, we make concrete recommendations for how relationship researchers can transition to greater disclosure of research practices in a manner that is sensitive to the unique design features of methodologies employed by relationship scientists. We discuss how to implement these recommendations for four different research designs regularly used in relationship research and …

Attachment Relationships Across Siblings And Their Common Mother: Patterns And Predictors, Kathleen Anne O'Connor

Electronic Thesis and Dissertation Repository

Traditional attachment theory suggests that because maternal state of mind regarding attachment is generally stable by adulthood, mothers should interact similarly with their children and, consequently, should share a similar quality of attachment with each. Early empirical work, however, suggests that the quality of siblings’ relationships is frequently different. Using varied theoretical and methodological approaches, this dissertation expanded upon the existing literature to further explore the nature and underpinnings of variability in the quality of mother-infant attachment across siblings.

Study 1 comprehensively described patterns of attachment within the family, investigating the extent to which the quality of siblings’ relationships with …

The Contribution Of Attachment Styles And Reassurance Seeking To Daily Mood And Relationship Quality In Romantic Couples, Lyndsay E. Evraire

Electronic Thesis and Dissertation Repository

Excessive reassurance seeking (ERS), defined as the stable tendency to excessively and persistently seek assurances from others, has recently emerged as a possible risk factor for interpersonal distress and depression. An important limitation in the ERS literature concerns the mechanism(s) by which individuals engage in ERS. The current daily diary study was among the first to examine the daily relationships among ERS, mood, and relationship quality in romantic couples, and explore how these associations were moderated by individual and partner attachment styles. Method: A sample of 110 heterosexual couples completed measures of attachment, ERS, symptoms of depression, and relationship quality. …

Developmental Differences In The Influence Of Phonological Similarity On Spoken Word Processing In Mandarin Chinese., Jeffrey G Malins, Danqi Gao, Ran Tao, James R Booth, Hua Shu, Marc F Joanisse, Li Liu, Amy S Desroches

Brain and Mind Institute Researchers' Publications

The developmental trajectory of spoken word recognition has been well established in Indo-European languages, but to date remains poorly characterized in Mandarin Chinese. In this study, typically developing children (N=17; mean age 10; 5) and adults (N=17; mean age 24) performed a picture-word matching task in Mandarin while we recorded ERPs. Mismatches diverged from expectations in different components of the Mandarin syllable; namely, word-initial phonemes, word-final phonemes, and tone. By comparing responses to different mismatch types, we uncovered evidence suggesting that both children and adults process words incrementally. However, we also observed key developmental differences in how subjects treated onset …

Striatum In Stimulus-Response Learning Via Feedback And In Decision Making., Nole M Hiebert, Andrew Vo, Adam Hampshire, Adrian M Owen, Ken N Seergobin, Penny A Macdonald

Brain and Mind Institute Researchers' Publications

Cognitive deficits are recognized in Parkinson's disease. Understanding cognitive functions mediated by the striatum can clarify some of these impairments and inform treatment strategies. The dorsal striatum, a region impaired in Parkinson's disease, has been implicated in stimulus-response learning. However, most investigations combine acquisition of associations between stimuli, responses, or outcomes (i.e., learning) and expression of learning through response selection and decision enactment, confounding these separate processes. Using neuroimaging, we provide evidence that dorsal striatum does not mediate stimulus-response learning from feedback but rather underlies decision making once associations between stimuli and responses are learned. In the experiment, 11 males …

Transcranial Magnetic Stimulation Of The Prefrontal Cortex In Awake Nonhuman Primates Evokes A Polysynaptic Neck Muscle Response That Reflects Oculomotor Activity At The Time Of Stimulation., Chao Gu, Brian D Corneil

Brain and Mind Institute Researchers' Publications

Transcranial magnetic stimulation (TMS) has emerged as an important technique in cognitive neuroscience, permitting causal inferences about the contribution of a given brain area to behavior. Despite widespread use, exactly how TMS influences neural activity throughout an interconnected network, and how such influences ultimately change behavior, remain unclear. The oculomotor system of nonhuman primates (NHPs) offers a potential animal model to bridge this gap. Here, based on results suggesting that neck muscle activity provides a sensitive indicator of oculomotor activation, we show that single pulses of TMS over the frontal eye fields (FEFs) in awake NHPs evoked rapid (within ∼25 …

Burning Pain Secondary To Clozapine Use: A Case Report., Bradley Linton, Rachel Fu, Penny A Macdonald, Hooman Ganjavi

Brain and Mind Institute Researchers' Publications

BACKGROUND: The first of the atypical antipsychotics introduced in the 1970s, clozapine remains the most efficacious neuroleptic to this day. However, serious and potentially fatal side effects have necessitated careful regular monitoring among prescribing clinicians. Some adverse effects (e.g. ischaemic bowel) remain under recognized, while newly identified adverse effects continue to be described in the literature.

CASE PRESENTATION: In this report, we describe a healthy 43-year old Caucasian male who experienced onset of a full body deep burning pain several months after the onset of treatment with clozapine. The pain worsened over time, ceased with cessation of treatment, and returned …

The Cost Of Moving Optimally: Kinematic Path Selection., Dinant A Kistemaker, Jeremy D Wong, Paul L Gribble

Brain and Mind Institute Researchers' Publications

It is currently unclear whether the brain plans movement kinematics explicitly or whether movement paths arise implicitly through optimization of a cost function that takes into account control and/or dynamic variables. Several cost functions are proposed in the literature that are very different in nature (e.g., control effort, torque change, and jerk), yet each can predict common movement characteristics. We set out to disentangle predictions of the different variables using a combination of modeling and empirical studies. Subjects performed goal-directed arm movements in a force field (FF) in combination with visual perturbations of seen hand position. This FF was designed …

Exploring Communication Apprehension And Its Relationship To Communication Attitude And Socio-Communicative Functioning In Children With Velopharyngeal Insufficiency, Agnieszka Dzioba

Electronic Thesis and Dissertation Repository

Myriad findings on children with velopharyngeal insufficiency (VPI) indicate the potential for this population of children to experience feelings of apprehension specific to communication and the potential for other psychological and social difficulties. The purpose of the present investigation was to explore the construct of communication apprehension (CA) and its potential relationship to social and communicative functioning in a diverse group of children with VPI. Potential linkages between CA and multiple socio-communicative constructs including attitude, speech satisfaction, speech and language skill, social competence, and speech severity were explored in a cohort of children with and without VPI, followed by an …

Mirror Reversal And Visual Rotation Are Learned And Consolidated Via Separate Mechanisms: Recalibrating Or Learning De Novo?, Sebastian Telgen, Darius Parvin, Jörn Diedrichsen

Brain and Mind Institute Researchers' Publications

Motor learning tasks are often classified into adaptation tasks, which involve the recalibration of an existing control policy (the mapping that determines both feedforward and feedback commands), and skill-learning tasks, requiring the acquisition of new control policies. We show here that this distinction also applies to two different visuomotor transformations during reaching in humans: Mirror-reversal (left-right reversal over a mid-sagittal axis) of visual feedback versus rotation of visual feedback around the movement origin. During mirror-reversal learning, correct movement initiation (feedforward commands) and online corrections (feedback responses) were only generated at longer latencies. The earliest responses were directed into a nonmirrored …

Dopaminergic Therapy Affects Learning And Impulsivity In Parkinson's Disease., Nole M Hiebert, Ken N Seergobin, Andrew Vo, Hooman Ganjavi, Penny A Macdonald

Brain and Mind Institute Researchers' Publications

OBJECTIVE: The aim was to examine the effect of dopaminergic medication on stimulus-response learning versus performing decisions based on learning.

METHOD: To see the effect of dopaminergic therapy on stimulus-response learning and response selection, participants with Parkinson's disease (PD) were either tested on and/or off their prescribed dose of dopaminergic therapy during different testing days. Forty participants with PD and 34 healthy controls completed the experiment on consecutive days. On Day 1, participants learned to associate abstract images with spoken, "right" or "left" responses via feedback (Session 1). On Day 2, participants recalled these responses (Session 2) and indicated the …

Developmental Stress, Condition, And Birdsong: A Case Study In Song Sparrows., Kim L Schmidt, Elizabeth A Macdougall-Shackleton, Shawn P Kubli, Scott A Macdougall-Shackleton

Brain and Mind Institute Researchers' Publications

Sexual-selection theory posits that ornaments and displays can reflect a signaler's condition, which in turn is affected both by recent and developmental conditions. Moreover, developmental conditions can induce correlations between sexually selected and other traits if both types of traits exhibit developmental phenotypic plasticity in response to stressors. Thus, sexually selected traits may reflect recent and/or developmental characteristics of signalers. Here, we review data on the relationships between birdsong, a sexually selected trait, and developmental and current condition of birds from a long-term study of a population of song sparrows (Melospiza melodia). Field studies of free-living birds indicate that the …

Self-Referential Processing: An Investigation Of The Mediating Role Of Alpha Power, Tanaz Javan

Electronic Thesis and Dissertation Repository

The EEG correlates of valenced self- and other-referential processing (SRP-ORP) are relatively little understood. This study examined the immediate effects of mindfulness meditation (MM) and EEG alpha neurofeedback (NFB) on resting state EEG alpha amplitudes and alpha event related (de-)synchronization (ERD/S) during an experimental implicit and explicit SRP-ORP task. Undergraduate students (n = 93) were randomized to a single session of MM, NFB alpha synchronization training (“alpha-up”), NFB alpha desynchronization training (“alpha-down”), or sham (placebo control) NFB before completing the Visual-Verbal Self-Other Referential Processing Task (VV-SORP-T). A reduction in resting-state alpha power over posterior cortex was observed across groups relative …

The Ha-Ha Holocaust: Exploring Levity Amidst The Ruins And Beyond In Testimony, Literature And Film, Aviva Atlani

Electronic Thesis and Dissertation Repository

ABSTRACT

Jewish humour sheds a crude light on the social, political, and historical realities of the Holocaust. Paradoxically, contentiously, doses of levity during this period were very much a reality, and even a psychological necessity. The purpose of my thesis is to explore the historical, social, and political ramifications of such laughter provoking manifestations. In doing so, the nuances are highlighted which are found within the laughter of the ghettos, the transit camps, and the concentration camps. Furthermore, some of these jokes, and their subsequent variations, reappear within the discourse of children of survivors. The dissertation explores how some of …

The Epidemic Of Mental And Neurological Health, Mohsyn I. Malik

Psychology Publications

This paper composes an image of modern mental and neurological health issues and looks to draw links to the current epidemic based on research and studies found online the internet and off-line. The goal is to examine what may be the underlying problem for a lot of these increases in mental health issues and neurodegenerative diseases and what are some promising clinical and sociocultural advances that may help. It explores problems such as the negative impact of the pharmaceutical giants, the increase in apathy in the work place and the general stigma towards mental disease. Through current research, the use …

When Objects Become Part Of Self: Effects Of Ownership And Choice On Self-Object Associations, Yang Ye

Electronic Thesis and Dissertation Repository

Despite its significant role in the society, ownership has received little research attention from social psychology. Understanding ownership as a form of people-object relations has important implications for social cognition, as the relations between people and objects share similar mechanisms with the relations between people and other social entities. Adopting an associative approach to relations, the present research investigates how ownership influences self-object association—mental associations between the owner’s self and the owned objects in the owner’s associative network. It is argued that the formation of self-object associations is gated by the levels of congruence or incongruence between the owner’s active …

Sharp Emergence Of Feature-Selective Sustained Activity Along The Dorsal Visual Pathway., Diego Mendoza-Halliday, Santiago Torres, Julio C Martinez-Trujillo

Brain and Mind Institute Researchers' Publications

Sustained activity encoding visual working memory representations has been observed in several cortical areas of primates. Where along the visual pathways this activity emerges remains unknown. Here we show in macaques that sustained spiking activity encoding memorized visual motion directions is absent in direction-selective neurons in early visual area middle temporal (MT). However, it is robustly present immediately downstream, in multimodal association area medial superior temporal (MST), as well as and in the lateral prefrontal cortex (LPFC). This sharp emergence of sustained activity along the dorsal visual pathway suggests a functional boundary between early visual areas, which encode sensory inputs, …

The Effect Of Exercise On Cigarette Craving And Withdrawal Symptoms While Using A Nicotine Lozenge, Amelia Tritter

Electronic Thesis and Dissertation Repository

It is imperative that smoking cessation aids effectively alleviate cigarette craving and withdrawal symptoms because their intensity has shown to predict relapse. The nicotine lozenge is a pharmacotherapy that has shown to reduce symptoms of craving and withdrawal. Research has also shown that a single session of exercise can provide temporary relief from craving and withdrawal for smokers who are both temporarily abstaining and undergoing a real quit attempt. Applying two efficacious monotherapies concurrently may provide additive benefit and greater symptom relief. Thirty recently quit smokers were randomized to either the experimental (exercise and lozenge) or control (lozenge alone) condition. …

Mediators Of Change In The Stigmatization Of Depression Among Caucasian And Asian Populations, Francois B. Botha

Electronic Thesis and Dissertation Repository

Public stigma negatively impacts public health by discouraging people with depression from seeking help. In North America, Asians reliably report higher levels of stigma and lower levels of help-seeking than do Caucasians. The reasons for this discrepancy and possible methods of reducing this have, however, rarely been explored. In Study 1, undergraduate students (n = 573) completed several questionnaires related to public stigma, values and ideological beliefs, attitudes and beliefs regarding people with depression and perceived norms. At least one week afterward, participants completed the second part of Study 1, where they were presented with contrived articles highlighting a …

The Antisaccade Task: Visual Distractors Elicit A Location-Independent Planning 'Cost', Jesse C. Desimone

Electronic Thesis and Dissertation Repository

Prosaccades are rapid eye movements with direct stimulus and response relations and are designed to bring the fovea onto a target or area of interest. In contrast, antisaccades require the inhibition of a prosaccade and the evocation of a saccade to a target’s mirror-symmetrical location. Previous work has shown that a remote (i.e., midline, contralateral) – but not proximal (i.e., ipsilateral) – task-irrelevant distractor relative to a visual target delays prosaccade reaction times (RT) (i.e., remote distractor effect: RDE). To my knowledge, however, no work has examined whether antisaccade RTs are similarly influenced by a RDE. Accordingly, I sought to …

Task-Switching In Oculomotor Control: Systematic Investigations Of The Unidirectional Prosaccade Switch-Cost, Jeffrey Weiler

Electronic Thesis and Dissertation Repository

An antisaccade requires suppressing a stimulus-driven prosaccade (i.e., response suppression) and remapping a target’s spatial location to its mirror-symmetrical position (i.e., vector inversion). Notably, my previous work demonstrated that the successful execution of an antisaccade selectively lengthens the reaction time (RT) of a subsequently completed prosaccade (i.e., the unidirectional prosaccade switch-cost; Weiler & Heath, 2012a; Weiler & Heath, 2012b). Thus, the objective of this dissertation was further investigate, and ultimately provide a mechanistic explanation for the unidirectional prosaccade switch-cost.

In Chapter Two, I demonstrate that the magnitude of the unidirectional prosaccade switch-cost is not dependent of the number of …

The Role Of The Media In The Automatic Dehumanization Of Refugees, Stelian Medianu

Electronic Thesis and Dissertation Repository

The media plays an important role in the process of shaping attitudes about controversial issues such as the arrival of refugees to Canada. The first aim of this research was to investigate how the Canadian newsprint media portrayed one noteworthy event involving the arrival of refugees to Canada: the arrival of the Tamil refugee boat to British Columbia in August of 2010. A media content analysis revealed that the overall portrayal of refugees in the Canadian press in response to this event was mixed. On the one hand, refugees were perceived either as bogus claimants or as criminals/terrorists. On the …

Human Premotor Areas Parse Sequences Into Their Spatial And Temporal Features., Katja Kornysheva, Jörn Diedrichsen

Brain and Mind Institute Researchers' Publications

Skilled performance is characterized by precise and flexible control of movement sequences in space and time. Recent theories suggest that integrated spatio-temporal trajectories are generated by intrinsic dynamics of motor and premotor networks. This contrasts with behavioural advantages that emerge when a trained spatial or temporal feature of sequences is transferred to a new spatio-temporal combination arguing for independent neural representations of these sequence features. We used a new fMRI pattern classification approach to identify brain regions with independent vs integrated representations. A distinct regional dissociation within motor areas was revealed: whereas only the contralateral primary motor cortex exhibited unique …

The Development And Validation Of A Multidimensional Measure Of Moral Orientation, Erica A. Giammarco

Electronic Thesis and Dissertation Repository

Researchers have found that when individuals are faced with moral dilemmas, they tend to approach the situations with the same general perspective. This general perspective is referred to as their moral orientation. Studies have shown that moral orientations tend to be either justice or care focused. A justice orientation refers to a focus on rights, rules, and objective decision making. In contrast, individuals using a care orientation are more likely to consider relationships, contextual factors, and minimizing harm to others. Although numerous studies have reported individual differences in these orientations, the literature has failed to consider how individuals with “abnormal” …

The Effects Of Semantic Neighborhood Density On The Processing Of Ambiguous Words, Mark J. Mcphedran

Electronic Thesis and Dissertation Repository

Semantic neighborhood density’s effects on the processing of ambiguous words were examined in three lexical decision experiments. Semantic neighborhoods were defined in terms of semantic set size and connectivity in Experiment 1, and in terms of semantic set size in Experiments 2 and 3. In Experiment 1, set size, connectivity, and ambiguity were crossed. An ambiguity disadvantage was observed for large set, high connectivity words, and there was some suggestion of an ambiguity advantage for small set, high connectivity words. Experiments 2 and 3 held connectivity constant at a high level, and set size and ambiguity were crossed, with Experiment …

Attachment And Attention: An Investigation Of Biases In Attention As They Relate To Attachment Security In Infancy And Adulthood, Paul J. Meinz

Electronic Thesis and Dissertation Repository

At the advent of attachment theory, John Bowlby hypothesized that cognition and emotion are shaped by early experiences with primary caregivers (Bowlby, 1980). This idea – that aspects of cognition may be organized within early relationships – still plays a prominent role in contemporary attachment theory. The studies described within this dissertation provide support for the idea that attachment security in infancy and adulthood are associated with differences in cognition – particularly with differences in the way that people attend to certain forms of stimuli. Mothers and children in the studies described here were first assessed for individual differences in …

Multi-Sector Service Use By Children In Contact With Ontario Mental Health Agencies, Christian M. Hahn

Electronic Thesis and Dissertation Repository

Children and youth frequently receive services for mental health issues from multiple service sectors but little is known about the rates of multi-sector involvement over time. Thus, the prevalence of multi-sector service use for children in contact with Ontario mental health agencies, and the influence of demographic, familial, and need variables on child multi-sector involvement, were examined. Secondary data analyses were performed on chart reviews of clients (N=355; 67% boys; ages 4 to 13) from six mental health agencies. Approximately two-thirds of clients had multi-sector involvement. In cross-sectional analyses, risk factors predicted increased likelihood of multi-sector involvement, whereas protective factors …