Nonlinear coupling between occipital and motor cortex during motor imagery: A dynamic causal modeling study

► A mental hand rotation task induced increased gamma and decreased beta oscillations. ► Stronger modulations were found for trials with slow compared to fast responses. ► We show how dynamic causal modeling can be used to study time-frequency modulations. ► Cross-frequency interactions between occipital and motor sources were revealed. ► A stronger influence of motor beta on occipital gamma was found for slow responses.