Assistant professor

Tomas Knapen

Assistant professor

E-mail: t.h.j.knapen@vu.nl
Phone: +31 (0) 20 598 99 74
Room: 1B-57

Personal webpage

Projects

I am working on an NWO ORA project investigating the multimodal spatial representation of attentional targets in the human brain using fMRI. Furthermore, I am involved in many of the ongoing ERC projects investigating reward and its impacts on attention and visual processing. The methods I use range from behaviour and psychophysics, to eye movement and pupil size recordings, EEG/MEG and fMRI. In terms of data analysis, I prefer to use fully open-source and documented methods (implemented in python) for the implementation of FIR and encoding model estimation.

Biography

After studying biology (theoretical / neurobiology) at the University of Amsterdam, I did a PhD at the physics of man department at Utrecht University on the topic of bistable perception. During and after my PhD I did psychophysics and fMRI projects at CalTech and Vanderbilt, in the Shimojo and Blake labs. My first postdoc was in Paris, France under the guidance of Patrick Cavanagh, during which I also conducted an fMRI experiment, again at Vanderbilt - but now at the Tong lab. After this postdoc I received an NWO VENI grant, which I used to investigate eye movement processes in the brain using fMRI, at the University of Amsterdam. At the end of this grant period, I left for a faculty position at the Cog Psy department at the VU University.

Research interests

I am interested in how the brain performs computations that allow it to perceive and act, and how these computations are learned. Specific topics of interest are 1. reward processing and neural plasticity in the visual system, 2. brain mechanism underlying attention and eye movements, leading into 3. the mechanisms of motor and perceptual learning. 4. I am also still very much involved in the investigation of bistable perception and its neural correlates.

Links

Google Scholar

Recent publications

Citations
SO Dumoulin & T Knapen (2018) How Visual Cortical Organization Is Altered by Ophthalmologic and Neurologic Disorders. Annual review of vision science
T van Mourik, L Snoek, T Knapen & DG Norris (2018) Porcupine: A visual pipeline tool for neuroimaging analysis. PLoS computational biology 14 (5), e1006064
J Brascamp, P Sterzer, R Blake & T Knapen (2018) Multistable perception and the role of the frontoparietal cortex in perceptual inference. Annual review of psychology 6912
T Mourik, LB Snoek, T Knapen & DG Norris (2018) Porcupine: A visual pipeline tool for neuroimaging analysis.
LC Reteig, T Knapen, FJFW Roelofs, KR Ridderinkhof & HA Slagter (2018) No evidence that frontal eye field tDCS affects latency or accuracy of prosaccades. bioRxiv, 351304
JC Van Slooten, S Jahfari, T Knapen & J Theeuwes (2018) Pupil responses as indicators of value-based decision-making. bioRxiv, 302166
T Knapen, D van Es & M Barendregt (2018) Mapping the Dark Side: Visual Selectivity of Default Network Deactivations. bioRxiv, 292524
DM van Es, J Theeuwes & T Knapen (2018) Spatial sampling in human visual cortex is modulated by both spatial and feature-based attention. bioRxiv, 147223
JC Van Slooten, S Jahfari, T Knapen & J Theeuwes (2017) Individual differences in eye blink rate predict both transient and tonic pupil responses during reversal learning. PloS one 12 (9), e01856651
L Reteig, T Knapen, K Ridderinkhof & H Slagter (2017) Transcranial direct current stimulation of the right frontal eye field to affect saccade execution. Journal of Vision 17 (10), 898-898
JW de Gee, O Colizoli, NA Kloosterman, T Knapen, S Nieuwenhuis & ... (2017) Dynamic modulation of decision biases by brainstem arousal systems. Elife 6, e2323218
S Jahfari, KR Ridderinkhof, AGE Collins, T Knapen, L Waldorp & MJ Frank (2017) Cross-task contributions of fronto-basal ganglia circuitry in response inhibition and conflict-induced slowing. bioRxiv, 1992991
E Kupers, J Brascamp & T Knapen (2016) Spatiotemporal BOLD correlates of switches in bistable perception. Journal of Vision 16 (12), 1216-1216
T Knapen, R Blake & J Brascamp (2016) Unreportable switches in bistable perception produce negligible fronto-parietal BOLD activity.. Journal of Vision 16 (12), 1327-1327
O Colizoli, JMJ Murre, HS Scholte, DM van Es, T Knapen & R Rouw (2016) Visual cortex activity predicts subjective experience after reading books with colored letters. Neuropsychologia 88, 15-274
T Knapen, JD Swisher, F Tong & P Cavanagh (2016) Oculomotor remapping of visual information to foveal retinotopic cortex. Frontiers in systems neuroscience 10, 543
T Knapen, JW de Gee, J Brascamp, S Nuiten, S Hoppenbrouwers & ... (2016) Cognitive and ocular factors jointly determine pupil responses under equiluminance. PLoS One 11 (5), e015557420
DM van Es & THJ Knapen (2016) Attention Warps Brain Space in a Somatotopic Frame of Reference.
DM van Es & THJ Knapen (2016) Attention Improves Stimulus Encoding in Early Visual Cortex.
JC van Slooten, THJ Knapen & JL Theeuwes (2016) Through the eyes, fast and slow: behaviourally relevant pupil responses on separate timescales.

View full list of publications on Google Scholar