Dirk Ostwald

Semantic Surprise Predicts the N400 Brain Potential

The paper tests a probabilistic hypothesis of the N400 brain potential by showing semantic surprise predicts its amplitude in a noun oddball paradigm.

Human belief state-based exploration and exploitation in an information-selective symmetric reversal bandit task

The paper presents a task and models human decision-making in an information-selective symmetric reversal bandit task, finding participants use a belief state-based hybrid strategy.

Neural surprise in somatosensory Bayesian learning

This study investigates Bayesian learning in somatosensory processing using EEG data, finding distinct neural signatures for model inadequacy and updating.

Belief states and categorical-choice biases determine reward-based learning under perceptual uncertainty

This study examines how belief states and categorical-choice biases influence reward-based learning under perceptual uncertainty using behavioral data from human participants.

Power, positive predictive value, and sample size calculations for random field theory-based fMRI inference

The paper develops power and positive predictive value functions for RFT-based fMRI inference and evaluates sample size requirements using a pilot study.

Evaluation of the 3D fractal dimension as a marker of structural brain complexity in multiple-acquisition MRI

This paper evaluates the fractal dimension as a marker of structural brain complexity in MRI, showing improved accuracy with scale optimization and highlighting registration's impact on FD estimates.

A perceptual decision making EEG/fMRI data set

The paper presents an EEG/fMRI dataset from human subjects performing a perceptual decision making task, available for validating computational models and processing algorithms.

Variational Bayesian parameter estimation techniques for the general linear model

The paper provides a theoretical and practical analysis of variational Bayes, VML, ReML, and ML methods applied to the general linear model in fMRI data analysis.