Naznin Virji-Babul

Associate Professor

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Biography

Dr. Virji-Babul is a physical therapist and a neuroscientist. Her Lab (Brain Development: Perception to Action) uses a combination of behavioural and brain imaging tools (i.e. DTI and EEG) to probe the brain and investigate the patterns of brain activation as they relate to perceptual-motor and social-emotional development in children and youth. Dr. Virji-Babul also has a strong research focus on concussion in adolescents. Her goals are to develop sensitive, multimodal measures of brain injury that can be used for early diagnosis and use these measures to chart the recovery process following concussion. Dr. Virji-Babul works collaboratively with faculty in Engineering, Physics, Mathematics and Statistics and in the Developmental Neurosciences and Child Health Cluster at the BC Children's Hospital Research Institute.

Graduate Student Supervision

Master's Student Supervision (2010-2017)
Comparing motor learning and mu suppression under short-term physical and observational practice in adults : a pilot study (2017)

Repeated physical practice is not always the optimal approach in rehabilitation, especially in individuals with severe motor-related problems. Research has shown the effectiveness of observational practice as a motor learning tool in various rehabilitation settings. However, little is known about the neurophysiological mechanisms underlying this mode of learning and whether similar behavioral and neurophysiological changes occur during physical and observational practice. The purpose of this study was to compare short-term physical and observational practice during the acquisition and retention of a novel motor task and to evaluate how each type of practice modulates EEG mu rhythm (8-13Hz). Thirty healthy individuals were randomly assigned to one of three groups: (1) physical practice (PP); (2) observational practice (OP); and (3) no practice (NP). The experiment consisted of three phases: training, testing (observing 10 minutes following training), and retention (performing 24 hours following training). Two behavioural measures (as indexed by total time and error) and brain responses (as indexed by mu suppression at the central regions) were examined. The results revealed: (1) that when comparing the PP group during their first exposure to the task to the OP group during their first exposure to the task, the OP group was significantly faster than the PP group, did not differ from the PP group in terms of error, (2) significant bilateral suppression of mu rhythm during PP and significant left lateralized mu suppression during OP, (3) significant bilateral mu suppression during observation after PP compared to that after OP and NP. Overall, the study demonstrates that OP induces neurophysiological (i.e., mu suppression) and behavioural (i.e., reduced total time) changes similar to that occur during PP. However, the different pattern of activation during the two types of practice suggests that OP does not activate the same brain areas activated during PP; rather, it triggers a subset of brain regions. Therefore, OP may be a good proxy for PP under conditions where PP is not possible. This is the first study to investigate changes in mu rhythm as a function of both PP and OP.

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Exploration and identification of neural correlates in healthy young adults during a graded cognitive, physical, and combined task : an EEG study (2017)

Returning to play following a sports related concussion remains a controversial process due to the emphasis placed on subjective symptom reporting. The development of an objective measure capable of assessing cortical recovery remains elusive, however EEG has shown promise with its ability to record during exercise. The objective of this pilot study was to examine the association between EEG metrics and behavioural changes in healthy young adults.The study involved 13 participants who performed a novel graded working memory task, a graded exercise session and a task combining the two together while EEG was recorded over 3 separate sessions. The tasks consisted of 5 levels of increasing difficulty and each participant performed the tasks in a randomized order. Participant heart rate, perceived exertion and accuracy were recorded between levels and tasks. EEG analysis applied power spectrum analysis and graph theoretical analysis to identify cortical activity and cortical networks changes.When graded exercise and cognition were combined, there was a significant change in behaviour and neural activity compared to when each task was completed individually. The combined task led to significant changes in brain and behavior as seen in EEG activation pattern, power output and frontal functional connectivity measures.These results suggest that following sports-related concussion individuals would require increased neural resources to complete a combined cognitive and exercise task. Following injury, these additional resources may not be available and result in a decrease in task performance. This data has the potential to be used in addition to existing concussion recovery tests in assuring full recovery prior to the return to play.

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Music and movement : the influence of tempo on the mirror neuron system in children (2015)

BACKGROUND: The mirror neuron system (MNS) is a neurological network associated with action-perception coupling, and is influenced by previous experiences. Visual, auditory, multi-modal, congruent and incongruent stimuli have been shown to modulate the response of the MNS throughout the various stages of human development. The musical attribute of tempo may exert a specific influence on action perception but this has not been studied in children. PURPOSE: The overarching purpose of this research is to explore the neurological interactions of music and action. This study asks the question, “How does the tempo of regular pulse influence perception of action in children?”METHODS: This research reflected on music and the MNS within the framework of dynamic systems theory (DST). A literature review examined the research relevant to the study question. Finally, a pilot study compared the responses in the MNS of 10 children during exposure to stimuli with tempi of 40 beats per minute (BPM) and 173BPM by examining the relative power of the mu rhythm frequency band (8-13Hz) in the sensorimotor cortex.RESULTS: Previous research suggests tempo significantly influences executed movements, cortical excitability, perception of emotion in music, and perception of synchrony in audio-visual stimuli. The pilot study identified significant mu suppression in the left sensorimotor cortex during visual conditions only, whereas the right sensorimotor cortex demonstrated significant mu suppression during auditory, visual and multi-modal conditions. In the left hemisphere, visual stimuli showed significantly greater mu suppression than auditory stimuli. In the right hemisphere, visual stimuli with a tempo of 173BPM showed significantly greater mu suppression than auditory stimuli with a tempo of 40BPM. The covariates of age, musical experience and dance experience were identified to have significant interactions with conditions.CONCLUSIONS: This pilot study provided the first evidence that visual stimuli result in stronger mu suppression compared to auditory stimuli in typically developing children, similar to that found in adults. Increased tempo was associated with stronger action-perception coupling for uni-modal stimuli. This study lacked statistical power to demonstrate differences between multi-modal stimuli exhibiting equivalent or differing tempi; further research with larger samples is needed to explore these influences.

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