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PhD Student






Mo. / Tu. / Wed. / Thu. / Fr.



Cubicus, room C243b



+31 (0)53 – 489 5529



+31 (0)53 – 489 5279



(room B217)



+31 (0)53 – 489 2895




Personal website










In 2012 I graduated Cum Laude from the University of Twente for my Master’s degree in Psychology. My master thesis subject was the influence of mindfulness training (MBSR) on pain perception. With EEG, we examined how MBSR influences the early sensory processing of pain stimuli.

In May 2012 I started as PhD student at the University Twente at the department of Psychology of conflict, risk and safety.


A liar’s nonverbal behavior is influenced by three factors: Emotional reactions, cognitive effort and attempted behavioral control. All three factors can reveal different cues to deception.

In my PhD-project I will examine whether signs of emotion, cognitive load and attempted behavior control are already present during the mere intention to lie, before a lie is even stated.

Furthermore, I will look to which degree cues to deception differ when people lie in a non-interactive context (e.g. lying against a computer) versus an interactive context (e.g. face-to-face in an interview).

Supervision: prof. dr. Ellen Giebels, dr.Elze Ufkes, dr. Matthijs Noordzij


Supervision of Research Assignments (bachelor) 201000121

Guest lecture Forensic Psychology (master) 201000143

Supervision of Bachelor theses 201000150


Ströfer, S., Noordzij, M.L., Ufkes, E.G. & Giebels, E. (2013). Misleiden: Meer dan liegen: Enkel de intentie om the misleiden verhoogt cognitieve belasting. In R. Dotsch, E. K. Papies, T. M. Pronk, B. T. Rutjens, J. van der Toorn & E. G. Ufkes (Eds.), Jaarboek sociale psychologie 2013. Groningen, the Netherlands: ASPO pers.

Ströfer S, Noordzij M.L., Ufkes E.G., Giebels E. (2015) Deceptive Intentions: Can Cues to Deception Be Measured before a Lie Is Even Stated? PLoS ONE 10(5): e0125237. doi: 10.1371/journal.pone.0125237