Rafael Hernan Polania Jimenez

Research Interests

Humans and animals routinely use different sources of information to choose the best course of action. For instance, during perceptual decisions, organisms discriminate choice options based on objective states of the environment (e.g., watermelons are heavier than cherries) whereas during value-based decisions, organisms make choices based on subjective preferences (e.g., cherries are tastier than watermelons). My research is focused on disentangling how humans make these types of decisions via combinations of computational modeling, brain imaging (EEG and fMRI) and brain stimulation (tDCS, tACS, TMS).

Selected Publications


Polania R, Moisa M, Opitz A, Grueschow M, Ruff CC. (2015)
The precision of value-based choices depends causally on fronto-parietal phase-coupling.
Nature Communications, DOI

Explanation for dummies ;) Here

Grueschow M, Polania R, Hare TA, Ruff CC. (2015)
Automatic versus Choice-Dependent Value Representations in the Human Brain.
Neuron, 85(4):874-85, DOI
Polania R, Krajbich I, Grueschow M, Ruff CC. (2014)
Neural oscillations and synchronization differentially support evidence accumulation in perceptual and value-based decision making.
Neuron, 82(3):709-20, DOI
Polania R, Nitsche MA, Korman C, Batsikadze G, Paulus W. (2012)
The Importance of Timing in Segregated Theta Phase-Coupling for Cognitive Performance.
Current Biology, 22(14):1314-8, DOI
Polania R, Nitsche MA, Paulus W. (2011)
Modulating functional connectivity patterns and topological functional organization of the human brain with transcranial direct current stimulation.
Human Brain Mapping, 32(8):1236-49, DOI
  • For a full list of publications please visit this Link