David Hessl, Ph.D.Principal Investigator

Dr. David Hessl is currently the director of the Translational Psychophysiology and Assessment Laboratory (T-PAL).  His research focuses on genetic, brain, environmental and neuroendocrine factors affecting cognition and behavior in individuals with fragile X-associated disorders. One important focus of the work in T-PAL is to develop and evaluate novel behavioral, cognitive and psychophysiological outcome measures of individuals with neurodevelopmental disorders.  These measures are designed to be used to detect improvement in functioning within controlled treatment trials.  Current psychophysiological studies have examined abnormalities in social gaze, sensorimotor gating, sympathetic nervous system activity, hypothalamic-pituitary-adrenal axis function, and potentiated startle responses.  Other recent studies have been aimed at improving aberrant behavior and cognitive measurements in individuals with fragile X syndrome, autism spectrum, intellectual disabilities, and other neurodevelopmental disorders.  A second major focus of Dr. Hessl’s work is the study of premutation carriers of fragile X.  As children these individuals are at increased risk for attention deficit hyperactivity disorder and autism and as older adults they become at risk for a neurodegenerative disease involving tremor, ataxia, and dementia.  Dr. Hessl (in collaboration with Dr. Susan Rivera) directs an NIMH-funded project examining genetics and the brain’s limbic system underlying emotional and psychiatric symptoms in men and women with the premutation.

Dr. Hessl earned his Ph.D. in clinical psychology from the University of Washington where his work focused on emotional and brain development in infants of depressed mothers under the supervision of Geraldine Dawson, Ph.D. He went on to a clinical internship at the Department of Psychiatry and Behavioral Sciences and the Lucile Packard Children's Hospital at Stanford University.  He also completed a MacArthur postdoctoral fellowship in psychophysiology under the supervision of W. Thomas Boyce, M.D. at the Institute of Human Development at UC Berkeley. His training continued at the Behavioral Neurogenetics Research Center at Stanford where he began his work on gene-brain-behavior studies in fragile X syndrome with Allan Reiss, M.D. He obtained an NIMH Career Development Award (K23) to examine the association between anxiety and autism symptoms in children with fragile X syndrome and the physiology underlying social anxiety problems such as gaze avoidance in these individuals.  Dr. Hessl is a licensed psychologist and his clinical interests involve cognitive, emotional, and behavioral evaluation of children, adolescents and adults with neurodevelopmental disorders, fragile X syndrome, autism spectrum disorders, ADHD, learning disabilities, and Tourette's syndrome. He conducts collaborative studies with researchers from several disciplines, including neuroscience, molecular genetics, and neuropathology in an effort to understand links between genetics, brain function and behavior.

Jessica Famula, M.S.

Jessica Famula, M.S. , M.S., CGCStaff Research Associate I

Jessica Famula is the clinical research coordinator for the Longitudinal Study of Brain and Cognition in Fragile X Premutation Carriers. She holds a Bachelor’s degree in Cognitive Science from the University of California, San Diego and a Master’s degree in Cognitive Science and Language from the University of Barcelona. She has been a member of the fragile X research team at the MIND Institute since 2011, during which time her work has focused on human development both in infants (Newborn Screening for Fragile X and Family Follow Up) and adults (Longitudinal Study of Brain and Cognition in Fragile X Premutation Carriers). Jessica is pursuing a career in research and her main area of interest is psycholinguistics.

Cindy Johnston, M.S., CGC

Cindy Johnston, M.S., CGC

Staff Research Associate IV

Cindy Johnston is a board-certified Genetic Counselor currently focusing her research efforts on the investigation of clinical characteristics associated with the fragile X premutation.  After receiving her Bachelor of Science in Psychology from Brown University, she gained five years of experience as a Research Coordinator at the Behavioral Neurogenetics Research Center at Stanford University.  It was here that she discovered her passion for fragile X syndrome as she studied factors influencing brain development and outcome in children with fragile X.  At this time, she also became particularly interested in examining the fragile X premutation, and first-authored an early publication demonstrating psychiatric symptoms in women with CGG repeats over 100.  After earning her Master’s degree in Genetic Counseling at the University of Colorado in 2006, Cindy worked primarily as a pediatric genetic counselor at University of California, San Francisco.  In clinical settings, she has focused on the counseling, management, and treatment of patients with inborn errors of metabolism.  Cindy’s long-term curiosity in the characterization of the premutation phenotype, along with her interest in treatment advances for FMR1-associated disorders, has brought her back to research and the fragile X community.

Melanie Rothfuss

 Melanie RothfussJunior Specialist

Melanie Rothfuss is a Junior Specialist in the Translational Psychophysiology and Assessment Laboratory. She joined the fragile X research team at the MIND Institute in 2011 while volunteering as an undergraduate research assistant. After graduating from UC Davis with a B.A.S. in Psychology and Music, she joined the T-PAL laboratory where she coordinates two studies in fragile X syndrome, including an autism behavioral intervention for young children with fragile X and a national fragile X registry and database study. She previously worked in a UC Davis psychology lab investigating the effects of music on autobiographical memory recall. Melanie is pursuing a career in research and plans to obtain a master's degree in psychology.

Stephanie Sansone

Stephanie Sansone

Postdoctoral Scholar

Stephanie Sansone is a postdoctoral scholar in the Translational Psychophysiology and Assessment Laboratory (T-PAL). She received her Ph.D. in Human Development from the University of California, Davis where her work focused broadly on the interaction between genes, environmental context, and developing psychophysiological systems (i.e. the HPA-axis and immune system) across the life span. Dr. Sansone was the recipient of the National Science Foundation (NSF) Graduate Research Fellowship and the UC Davis Graduate Research Mentorship Fellowship. Her dissertation work used a gene-environment interaction approach to examine (1) the increased susceptibility of some women with the fragile X permutation to develop autoimmune-related diseases, and (2) cortisol as a possible biological mechanism underlying this phenomenon. She currently coordinates the multi-site study, “A Cognitive Test Battery for Intellectual Disabilities,” which aims to determine whether certain types of intellectual or cognitive tests are reliable, valid, and sensitive to developmental change among individuals with intellectual disability.

Andrea Schneider, Ph.D.

Andrea Schneider, Ph.D.Assistant Researcher
Dr. Andrea Schneider is an Assistant Researcher at the University of California at Davis, MIND Institute.  From very early on in her academic career, she focused on interdisciplinary research with brain-behavior interactions and acquired broad knowledge in clinical psychology and medical neuroscience, with specific training and expertise in ADHD, learning disabilities, and fragile X.  As a graduate student, she studied the neurophysiological bases of ADHD (Attention-Deficit and Hyperactivity-Disorder) and dyslexia.  Being also a clinical psychologist, her other area of interest is intervention research.  She completed a pilot study of a phytopharmacological intervention (Ginkgo biloba) in dyslexia, and a study about the efficacy of neurofeedback in ADHD.  Currently, her main research interest is the association between genetic and brain abnormalities underlying the neuropsychopathology, behavioral, and psychiatric symptoms in individuals with the fragile X mutations and the development of EEG as an outcome measure for targeted treatment trials.  She is an active member of the Social Skills Program at the MIND Institute since 2008.  She is an affiliate of the ARTP (Autism Research and Treatment) program at the MIND Institute, a member of the FENS (Federation of European Neuroscience Society), and the Center for Cognitive Studies, University Potsdam, Germany.  

Forrest McKenzie and Madeleine Schloetter

Forrest McKenzie and Madeleine Schloetter

Forrest McKenzie and Madeleine Schloetter are student research assistants on the T-PAL team who have been working on the Cognitive Test Battery for Intellectual Disabilities project since the January 2015. Forrest is a 4th year undergraduate at UC Davis majoring in Managerial Economics and aspiring to attend medical school. Madeleine will be graduating in Spring 2016 with a B.S. in Biotechnology and a minor in Economics from UC Davis. She is looking to pursue a career in clinical research and regulatory affairs. Madeline and Forrest assist with a variety of aspects in our lab and enjoy working closely with study participants and their families to ensure they have a positive experience with research.