CCNP Meetings

Elsa Fouragnan
Professor of Neuroscience, Director
Center for Therapeutic Ultrasound (CENTUS)
University of Plymouth

This talk will present recent evidence demonstrating that low intensity Transcranial focused Ultrasound Stimulation (TUS) can induce transient, targeted neuroplastic changes in the human brain, with implications for both mechanistic research and therapeutic development. I will highlight TUS’s precision in targeting deep brain structures, its value in probing neural circuits, and its emerging clinical potential in psychiatric disorders. Drawing on recent human studies; including investigations into decision-making and their potential clinical translation; I will present evidence of TUS’s effects on task-related neural changes and behaviour demonstrating its promise as a transformative neuromodulation tool.

Ugne Ziausyte
MD/PhD Student, Robert Wood Johnson Medical School
Rutgers University/Princeton University

Compulsivity is characterized by repetitive, self-deleterious behavior, often performed despite the knowledge of its disruptive effects on the pursuit of long-term goals. While classically characterized as a symptom driven by overactive habit systems, recently, alternative conceptualizations have emerged. In this talk, I will introduce an upcoming study that investigates how compulsivity may be explained through the lens of latent cause inference – a theory describing how people understand their environment by categorizing their experiences into shared, unobservable causes – in populations with obsessive compulsive disorder (OCD) or alcohol use disorder (AUD), two canonical disorders of compulsivity. After providing a methodological overview of the novel task designed for this study, I will describe the behavioral and neural hypotheses in detail and share predictions for study results.

William Koller
Postdoctoral Research Associate, Princeton Neuroscience Institute
Princeton University

Schizophrenia is characterized by profound departures from consensus models of reality, with symptoms like delusions, disorganization, and perceptual disturbances implying breakdowns in how the mind infers structure from experience. In this talk, I’ll explore how schizophrenia may be connected to disruptions in latent cause inference — the process through which people cluster related observations according to shared, unobservable causes — and describe an ongoing CCNP study measuring this process in individuals with schizophrenia. After providing a methodological overview of three behavioral tasks (a movie-segmentation task, a sentence-reading task, and a “microbes” categorization task), I’ll share preliminary findings suggesting that schizophrenia is associated with disruptions in how people segment latent causes during naturalistic movie viewing.

Alexander Shackman
Professor
Department of Psychology
University of Maryland

Anxiety—widely conceptualized as a sustained state of heightened distress and arousal triggered by uncertain threat—is a fundamental aspect of mammalian experience and a key component of the National Institute of Mental Health’s influential RDoC framework. When extreme or pervasive, anxiety imposes a staggering burden on patients, public health, and the global economy. Existing treatments are far from curative for many, underscoring the urgency of developing a deeper understanding of the underlying mechanisms. Here, I will highlight data gleaned from studies of humans and monkeys. Using a combination of approaches—from genetic assays and loss-of-function experiments to ecological momentary assessment and computational neuroimaging—this work provides fresh insights into the nature and the neurobiology of anxiety related states, traits, and psychiatric disorders.

View a recording of this session here.

Christopher Rozell
Professor, Executive Director of Institute for Neuroscience, Neurotechnology & Society (INNS)
Department of of Electrical & Computer Engineering
Georgia Institute of Technology

Simultaneous advances in neurotechnology and data science have created new opportunities to measure, modulate and understand the neural activity underlying complex psychiatric disorders such as treatment resistant depression (TRD). Despite promising explorations of deep brain stimulation (DBS) as a therapy for TRD, one of the barriers to scaling this treatment is the lack of objective information supporting clinical decision making during recovery. I will describe our recent efforts collecting and analyzing longitudinal intracranial electrophysiology data from TRD patients undergoing subcallosal cingulate cortex (SCC) DBS, as well as our development of novel AI techniques to identify electrophysiology biomarkers of disease recovery state. Finally, I will show how this data-driven biomarker can potentially be used in clinical decision support through patient case studies, as well as shed light on the microcircuit structures and complex behaviors that underly TRD pathology and recovery.

View a recording of this session here.

Vanessa Brown
Assistant Professor
Department of Psychology
Emory University

Avoidance is a central impairment in anxiety disorders, but what causes maladaptive avoidance in this population is unclear. To date, empirical data suggest that the uncertainty associated with negative outcomes, rather than the presence of negative outcomes alone, drives avoidance in anxiety. Here, we used the explore-exploit dilemma – whether to explore options with uncertain options versus stay with known choices with certain options – to understand how exploration goes awry in anxiety and leads to avoidance. Across two tasks, we did not find an overall avoidance of uncertainty, manifesting as increased exploitation, in anxiety. Instead, people with anxiety were unable to adaptively adjust exploration, under-exploring when exploration was adaptive and over-exploring when exploration was harmful. This impairment was specific to anxiety and not to depression or general internalizing symptoms. In a follow-up study, we tested whether this maladaptive exploration of uncertainty was distinct from previously established alterations in model-based decision-making in compulsivity. Anxiety was associated with increased model-based planning while compulsivity showed patterns of exploratory behavior distinct from anxiety. These results show a computational dissociation of exploratory behavior among internalizing symptom clusters and suggest that maladaptive exploration of uncertainty is a unique signature of anxiety-related disorders.

View a recording of this session here.

Vinny Costa
Associate Professor
Department of Psychiatry and Behavioral Sciences
Emory University

Curiosity and exploration support learning and adaptive decision-making in uncertain environments. While these processes are sensitive to motivational context, it remains unclear how outcome valence shapes exploration across species. Human studies suggest that aversive contexts increase exploration, but these effects often rely on verbal framing and explicit instructions. To gain deeper insight into how exploration strategies emerge from experience alone, this study investigated the influence of hedonic valence on novelty seeking, exploration, and reinforcement learning in rhesus macaques. Using visual tokens as secondary reinforcers, we found that monkeys explored novel, uncertain options more frequently when exploitation would lead to losses rather than gains. However, our analyses clarified that this heightened novelty seeking was primarily a consequence of the monkeys employing an optimistic prior belief about the value of novelty, rather than a categorical, valence-dependent shift in their underlying curiosity or the information bonus associated with exploration. Approach and avoidance motivation did influence other aspects of reinforcement learning. Monkeys demonstrated faster learning from losses than from gains, indicating that they were averse to losing tokens. They also frequently chose an option and then quickly cancelled their choices. These choice cancellations were strategic responses to approach-avoidance conflicts and uncertainty, and represented self-generated bouts of exploratory behavior that led to valence-dependent use of directed and random exploration. These findings suggest that different strategies are used to manage explore-exploit tradeoffs induced by novelty or internal motivational conflicts, revealing dissociable effects of curiosity and hedonic valence on reinforcement learning.

View a recording of this session here.

Robb Rutledge
Assistant Professor of Psychology and Psychiatry
Yale University

The happiness of individuals is an important metric for societies, but we know relatively little about how daily life events are aggregated into subjective feelings. We show that happiness depends on the history of expectations and prediction errors resulting from those expectations, a result we have now replicated in thousands of individuals using smartphone-based data collection (https://happinessquest.app). Using fMRI, we show how happiness relates to neural activity and to the neuromodulator dopamine. We apply this computational framework to a range of problems including how happiness depends on intrinsic reward and how it changes during conversations with artificial intelligence. Using computational models for decision making and reinforcement learning, we show how feelings vary across individuals during multiple tasks and in relation to major depression.

View a recording of this session here.

Claire Gillan
Professor in Psychology
Trinity College Dublin

Theories about the role of the brain’s habit system in compulsive disorders have been around for decades. Although progress has been made, most research has focused on goal-directed processes, i.e., the brain systems that help rein in habits. This is because habits themselves, although perhaps the most ubiquitous mode of action selection, remain among the most difficult phenomena to study empirically. This has led to a lack of mechanistic clarity in leading theories of compulsion and a prevailing ‘deficit’ model centred on decreased functioning of prefrontal brain regions that support cognitive control. This overlooks the potential adaptive value of a potentiated habit system in compulsivity: the rapid acquisition of stimulus–response representations that promote early automaticity, efficiency, and functional advantage. In this talk, I discuss new research that aims to remedy this and reveals ‘hidden habits’: patterns detectable through behavioural and electrophysiological methods, both inside and outside the lab, in healthy and transdiagnostic populations. Across various temporal horizons, I convey a mechanistic account of the role of habit in compulsive disorders that separates state from trait, risk from resilience, and benefits versus costs. Given the clear benefits of habits in everyday life, I conclude by considering what a neurodiversity-informed framework for compulsivity might entail.

View a recording of this session here.