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Dr Fabian Grabenhorst

Dr Fabian Grabenhorst

Wellcome Trust/Royal Society Sir Henry Dale Fellow

University Lecturer


Research Interests

How do we decide what to eat? In humans, the reward value derived from sensory and nutritional food components motivates sophisticated forms of eating behaviour, including consumption-planning, decision-making, and social influences on food choice. Specific nutrients—such as fats, sugars, and their sensory qualities—are particularly effective rewards that drive such behaviours and contribute to overeating and obesity. Because neurons in the brain’s reward system set the goals for behaviour, we aim to understand how such reward neurons process specific food components to guide planning and decision-making. We focus on the amygdala, a key component of the reward system that is implicated in such diverse conditions as depression, autism, and obesity. Our recent data indicate that beyond basic reward functions, amygdala neurons participate in advanced reward-guided behaviours, including economic decision-making and social learning.

We study the mechanisms for eating behaviour and reward-based decisions in individual neurons and functional brain systems. We conduct single-neuron recordings in animals performing behavioural tasks for nutrient-defined food rewards. These experiments identify the precise information processing by neurons in key reward structures, including the amygdala. In parallel, we conduct closely related human neuroimaging studies to translate and extend the single-neuron data to human brain systems, real-life eating phenotypes, and inter-individual differences. Our broader goal is to uncover basic neurophysiological reward mechanisms that underlie human eating behaviour and thereby to lay foundations for clinical studies in obesity.

Collaborators

Prof Gustavo Deco (Universitat Pompeu Fabra, Barcelona)

Prof Sadaf Farooqi (Clinical Biochemistry, Cambridge)

Prof Paul Fletcher (Psychiatry, Cambridge)

Prof Wolfram Schultz (PDN, Cambridge)

Key Publications

Grabenhorst, F.*, Hernadi, I.*, and Schultz, W. (2016). Primate amygdala neurons evaluate the progress of self-defined economic choice sequences. Elife 5. (*Joint first authors). PMID:27731795. PMCID:PMC5061547

Zangemeister, L.*, Grabenhorst, F.*, and Schultz, W. (2016). Neural Basis for Economic Saving Strategies in Human Amygdala-Prefrontal Reward Circuits. Curr Biol: CB 26, 3004-3013. (*Joint first authors). PMID:27773572. PMCID:PMC5130697

Tsutsui, K.*, Grabenhorst, F.*, Kobayashi, S., and Schultz, W. (2016). A dynamic code for economic object valuation in prefrontal cortex neurons. Nature Commun 7, 12554. (*Joint first authors). PMID:27618960. PMCID:PMC5027248

Hernadi, I.*, Grabenhorst, F.*, and Schultz, W. (2015). Planning activity for internally generated reward goals in amygdala neurons. Nature Neurosci 18, 461-469. (*Joint first authors). PMID:25622146. PMCID:PMC4340753

Grabenhorst, F., and Rolls, E.T. (2014). The representation of oral fat texture in the human somatosensory cortex. Hum Brain Mapp 35, 2521-2530. PMID:24038614

Grabenhorst, F.*, Hernadi, I.*, and Schultz, W. (2012). Prediction of economic choice by primate amygdala neurons. Proc Natl Acad Sci U S A 109, 18950-18955. (*Joint first authors). PMID:23112182. PMCID:PMC3503170

Grabenhorst, F., and Rolls, E.T. (2011). Value, pleasure and choice in the ventral prefrontal cortex. Trends Cogn Sci 15, 56-67. PMID:21216655

Grabenhorst, F., Rolls, E.T., Parris, B.A., and D’Souza, A. (2010). How the brain represents the reward value of fat in the mouth. Cereb Cortex 20, 1082-1091. PMID:19684248

Plain English

How do we decide what to eat? Why do we like some foods more than others and sometimes consume too much of them? Nutrients such as fats and sugars are particularly effective rewards that provide us with necessary calories but also contribute to obesity. Our research investigates how individual cells in the brain's reward system analyse the sensory and nutrient components of foods during sophisticated forms of food-intake behaviours, including decision-making and social interactions.