Rhiannon L Cowan

Electrophysiological Dynamics of Default Network Suppression

The paper investigates network competition in the brain using electrophysiology and neuroimaging, finding temporally layered antagonism between default and task-related networks, with distinct patterns in the hippocampus.

Low-dimensional factorized neural computations underlie risk-adaptive choices

The paper uses deep reinforcement learning to model risk-adaptive decision-making strategies and identifies low-dimensional neural dynamics associated with high-performing strategies in humans.

Temporal Processing during Decision Making under Uncertainty.

The paper investigates neural representations of time during decision-making under risk using human intracranial electro-physiology and a temporal convolution network to predict response timing.

Polysemanticity in human hippocampal neurons

This study shows that human hippocampal neurons use polysemantic coding, where neurons represent multiple unrelated semantic features through high-dimensional superposition, enabling efficient contextualization of meaning.

A geometric foundation for word meaning in the brain

The paper shows that semantic features in word meaning are encoded in the brain through geometric structures similar to those in language models.

Asymmetric Reinforcement Learning Explains Human Choice Patterns in Decision-making Under Risk

This study shows that an asymmetric reinforcement learning model better explains human decision-making under risk than symmetric models.

Increased Aperiodic Exponents Track Depression Symptom Severity

This study shows that aperiodic exponents from intracranial EEG can differentiate depression symptom severity and correlate with specific brain regions and networks.

Human single-neuron activity is modulated by intracranial theta burst stimulation of the basolateral amygdala

This study examines how theta burst stimulation of the basolateral amygdala modulates single-neuron activity in humans during a memory task, finding that ~30% of neurons show heterogeneous responses.

Cell-type specific responses to single-pulse electrical stimulation of the human brain

This study examines how human neurons respond to single-pulse electrical stimulation, finding that most neurons show firing rate suppression, with differences based on cell type and stimulation distance.

Human brain network control of creativity

This study uses human brain recordings to show that creative thinking is associated with distinct neural states in the default mode and dorsal attention networks.

Human and Rodent Seizures Demonstrate a Dynamic Interplay with Spreading Depolarizations

This study shows that spreading depolarizations (SDs) are associated with seizure termination in both human and rodent models, with SDs reducing seizure duration and delaying subsequent events.

More widespread and rigid neuronal representation of reward expectation underlies impulsive choices

The paper investigates how neuronal representations of reward and risk expectations differ between impulsive and less impulsive decision-makers during a risky choice task.