Topic: orbitofrontal cortex

Different prefrontal areas contribute in distinctly different ways to rule-guided behaviour in the context of a Wisconsin Card Sorting Test (WCST) analog for macaques. For example, causal evidence from circumscribed lesions in NHPs reveals that dorsolateral prefrontal cortex (dlPFC) is necessary to maintain a reinforced abstract rule in working memory, orbitofrontal cortex (OFC) is needed to rapidly update representations of rule value, and the anterior cingulate cortex (ACC) plays a key role in cognitive control and integrating information for correct and incorrect trials over recent outcomes

Animals often seek knowledge of no apparent extrinsic value, suggesting that knowledge is a source of intrinsic value. Therefore, the desire to acquire information may be an innate motivational drive. We have developed a task in mice to study the neural mechanisms that compute the value of informative stimuli that drive information seeking. Mice are provided with odor cues in a center port that dictate entry into one of two side ports. The side ports offer water reward with identical probability and differ only in whether they provide an information odor cue that reveals the reward outcome. We

Hemispheric asymmetry in functional connectivity of the orbitofrontal cortex (OFC) has been recently demonstrated in reward-related cognitive tasks like gambling. In this work, which was part of our Neuromatch Academy 2022 project, we used resting state and task-dependent fMRI data from 339 human subjects from the Human Connectome Project (HCP 2020) to quantify the asymmetry of functional connectivity between left and right OFC, and posterior OFC (pOFC) regions during rest and task blocks. We then aimed to relate this asymmetry index (AI) to reward-driven impulsivity traits, quantified by subj

The project of functional neuroanatomy typically considers single brain areas as the core functional unit of the brain. Functional neuroanatomists typically use specialized tasks that are designed to isolate hypothesized functions from other cognitive processes. Our lab takes a broader view; specifically, we consider brain regions as parts of larger circuits and we take cognitive processes as part of more complex behavioral repertoires. In my talk, I will discuss the ramifications of this perspective for thinking about the role of the orbitofrontal cortex. I will discuss results of recent expe

Goal-directed navigation requires precise estimates of spatial relationships between current position and future goal, as well as planning of an associated route or action. While neurons in the hippocampal formation can represent the animal’s position and nearby trajectories, their role in determining the animal’s destination or action has been questioned. We thus hypothesize that brain regions outside the hippocampal formation may play complementary roles in navigation, particularly for guiding goal-directed behaviours based on the brain’s internal cognitive map. In this seminar, I will first

Classic economists proposed that economic choices rely on the computation and comparison of subjective values. This hypothesis continues to inform economic theory and experimental research, but behavioral measures are ultimately not sufficient to prove the proposal. Consistent with the hypothesis, when agents make choices, neurons in the orbitofrontal cortex (OFC) encode the subjective value of offered and chosen goods. Moreover, neuronal activity in this area suggests the formation of a decision. However, it is unclear whether these neural processes are causally related to choices. More gener

Human neuroimaging research has consistently shown that drug addiction is associated with structural and functional changes within the orbitofrontal cortex (OFC). In view of the important role of the OFC in value-based decision-making, these changes have been hypothesised to bias choice towards drug use despite and at the expense of other competing pursuits, thereby explaining drug addiction. Here I will present in vivo recording data in the OFC supporting this hypothesis in a choice-based model of addiction where rats could choose between two actions, one rewarded by a drug (cocaine or heroin

Learning the consequences our choices have as we interact with our world is critical for flexible behavior. Relational knowledge of one’s environment gives structure to otherwise-individual one-to-one stimulus-outcome mappings, providing a substrate to globally update behavioral contingencies in the face of changes in the landscape of reward. In the brain, this relational knowledge is thought to be encoded in the hippocampus (HPC) in the form of a cognitive map, while prefrontal regions, such as orbitofrontal cortex (OFC), are thought to instantiate subjective estimates of location on the map,

Animals are motivated to acquire knowledge. A particularly striking example is information seeking behavior: animals often seek out sensory cues that will inform them about the properties of uncertain future rewards, even when there is no way for them to use this information to influence the reward outcome, and even when this information comes at a considerable cost. Evidence from monkey electrophysiology and human fMRI studies suggests that orbitofrontal cortex and midbrain dopamine neurons represent the subjective value of knowledge during information seeking behavior. However, it remains un

The correlation between cognitive function, mood states, and driving behavior remains unclear. Hence, we aimed to explore this relationship objectively, by functional magnetic resonance imaging (fMRI). In a cross-sectional design, 28 male 20 to 30-year-old drivers were randomly included in the study. Each participant drove virtually in an fMRI-compatible driving simulator, after auditory and visual induction of positive, negative, and neutral mood; and fMRI was performed meanwhile to explore brain activity alterations. The analysis was performed using SPM software by performing seed-based conn