Katharine Thakkar
Assistant Professor of Psychology Michigan State University
Biography
Areas of Expertise
Education
Vanderbilt University
Ph.D.
Psychology
2012
Boston University
B.A.
Mathematics
2004
Boston University
BA
Psychology
2004
Research Focus
The biological causes for the symptoms of psychotic disorder
Dr. Thakkar has a long-standing interest in understanding the biological causes for the symptoms of psychotic disorders, like schizophrenia and schizoaffective disorder, so that they may be more effectively treated. She uses a variety of methods to understand the basic building blocks of impaired cognitive abilities, social difficulties, and psychotic symptoms like hallucinations and delusions.
Research Grants
Uncovering pathophysiological mechanisms of psychosis using the oculomotor system
NIMH, R01
2017-2021
Sensory consequences of action in children with autism spectrum disorders
NIMH, R21
2017-2019
Co-Pi with Jennifer Foss-Feig
Corollary discharge disturbances in schizophrenia: investigating the role of the thalamus
Brain and Behavior Foundation
2016-2019
NARSAD Young Investigator Award
Journal Articles
Reduced pupil dilation during action preparation in schizophrenia
International Journal of PsychophysiologyKatharine N Thakkar, Jan W Brascamp, Livon Ghermezi, Kassidy Fifer, Jeffrey D Schall, Sohee Park
2018
Impairments in cognitive control—the ability to exert control over thoughts and actions and respond flexibly to the environment—are well-documented in schizophrenia. However, the degree to which experimental task performance reflects true cognitive control impairments or more general alterations in effort, arousal and/or task preparedness is unclear. Pupillary responses can provide insight into these latter factors, as the pupil dilates with degree of cognitive effort and response preparation...
Eye gaze perception in bipolar disorder: Self‐referential bias but intact perceptual sensitivity
Bipolar DisordersBeier Yao, Savanna A Mueller, Tyler B Grove, Merranda McLaughlin, Katharine Thakkar, Vicki Ellingrod, Melvin G McInnis, Stephan F Taylor, Patricia J Deldin, Ivy F Tso
2018
Deficits in social cognition predict poor functional outcome in severe mental illnesses such as schizophrenia and autism. However, research findings on social cognition in bipolar disorder (BD) are sparse and inconsistent. This study aimed to characterize a critical social cognitive process—eye gaze perception—and examine its functional correlates in BD to inform psychopathological mechanisms.
Altered short-term neural plasticity related to schizotypal traits: Evidence from visual adaptation
Schizophrenia researchKatharine N Thakkar, Anna Antinori, Olivia L Carter, Jan W Brascamp
2018
Abnormalities in synaptic plasticity are argued to underlie the neural dysconnectivity observed in schizophrenia. One way to measure synaptic plasticity is through sensory adaptation, whereby sensory neurons exhibit reduced sensitivity after sustained stimulus exposure. Evidence for decreased adaptation in individuals with schizophrenia is currently inconclusive, possibly due to heterogeneity in clinical and medication status across
samples.
Oculomotor Prediction: A Window into the Psychotic Mind
Trends in Cognitive ScienceKatharine N. Thakkar, Vaibhav A. Diwadkar, Martin Rolfs
2017
Psychosis – an impaired contact with reality – is a hallmark of schizophrenia. Many psychotic symptoms are associated with disruptions in agency – the sense that ‘I’ cause my actions. A failure to predict sensory consequences of one’s own actions may underlie agency disturbances. Such predictions rely on corollary discharge (CD) signals, ‘copies’ of movement commands sent to sensory regions prior to action execution. Here, we make a case that the oculomotor system is a promising model for understanding CD in psychosis, building on advances in our understanding of the behavioral and neurophysiological correlates of CD associated with eye movements. In this opinion article, we provide an overview of recent evidence for disturbed oculomotor CD in schizophrenia, potentially linking bizarre and disturbing psychotic experiences with basic physiological processes.
7T Proton Magnetic Resonance Spectroscopy of Gamma-Aminobutyric Acid, Glutamate, and Glutamine Reveals Altered Concentrations in Patients With Schizophrenia and Healthy Siblings
Biological PsychiatryKatharine N. Thakkar, et. al.
2016
The N-methyl-D-aspartate receptor hypofunction model of schizophrenia predicts dysfunction in both glutamatergic and gamma-aminobutyric acidergic (GABAergic) transmission. We addressed this hypothesis by measuring GABA, glutamate, glutamine, and the sum of glutamine plus glutamate concentrations in vivo in patients with schizophrenia using proton magnetic resonance spectroscopy at 7T, which allows separation of metabolites that would otherwise overlap at lower field strengths. In addition, we investigated whether altered levels of GABA, glutamate, glutamine, and the sum of glutamine plus glutamate reflect genetic vulnerability to schizophrenia by including healthy first-degree relatives.
Disrupted Saccadic Corollary Discharge in Schizophrenia
The Journal of NeuroscienceKatharine N. Thakkar, Jeffrey D. Schall, Stephan Heckers and Sohee Park
2015
Disruptions in corollary discharge (CD), motor signals that send information to sensory areas and allow for prediction of sensory states, are argued to underlie the perceived loss of agency in schizophrenia. Behavioral and neurophysiological evidence for CD in primates comes largely from the saccadic double-step task, which requires participants to make two visually triggered saccadic eye movements in brief succession. Healthy individuals use CD to anticipate the change in eye position resulting from the first saccade when preparing the second saccade. In the current study with human participants, schizophrenia patients and healthy controls of both sexes performed a modified double-step task.
Altered Brain Activation During Action Imitation and Observation in Schizophrenia: A Translational Approach to Investigating Social Dysfunction in Schizophrenia
The American Journal of PsychiatryKatharine N. Thakkar, et al.
2014
Social impairments are a key feature of schizophrenia, but their underlying mechanisms are poorly understood. Imitation, a process through which we understand the minds of others, involves the so-called mirror neuron system, a network comprising the inferior parietal lobe, inferior frontal gyrus, and posterior superior temporal sulcus. The authors examined mirror neuron system function in schizophrenia.
Disturbances in Body Ownership in Schizophrenia: Evidence from the Rubber Hand Illusion and Case Study of a Spontaneous Out-of-Body Experience
Plos OneKatharine N. Thakkar, et al.
2011
A weakened sense of self may contribute to psychotic experiences. Body ownership, one component of self-awareness, can be studied with the rubber hand illusion (RHI). Watching a rubber hand being stroked while one's unseen hand is stroked synchronously can lead to a sense of ownership over the rubber hand, a shift in perceived position of the real hand, and a limb-specific drop in stimulated hand temperature. We aimed to assess the RHI in schizophrenia using quantifiable measures: proprioceptive drift and stimulation-dependent changes in hand temperature.
Response Inhibition and Response Monitoring in a Saccadic Countermanding Task in Schizophrenia
Biological PsychiatryKatharine N. Thakkar, et al.
2010
Cognitive control deficits are pervasive in individuals with schizophrenia (SZ) and are reliable predictors of functional outcome, but the specificity of these deficits and their underlying neural mechanisms have not been fully elucidated. The objective of the present study was to determine the nature of response inhibition and response monitoring deficits in SZ and their relationship to symptoms and social and occupational functioning with a behavioral paradigm that provides a translational approach to investigating cognitive control.
