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Moerland, T.M. (author), Deichler, Anna (author), Baldi, S. (author), Broekens, D.J. (author), Jonker, C.M. (author)
Planning and reinforcement learning are two key approaches to sequential decision making. Multi-step approximate real-time dynamic programming, a recently successful algorithm class of which AlphaZero [Silver et al., 2018] is an example, combines both by nesting planning within a learning loop. However, the combination of planning and learning...
book chapter 2020
document
Xu, J. (author), Broekens, D.J. (author), Hindriks, K.V. (author), Neerincx, M.A. (author)
Mood contagion is an automatic mechanism that induces a congruent mood state by means of the observation of another person's emotional expression. In this paper, we address the question whether robot mood displayed during an imitation game can (a) be recognized by participants and (b) produce contagion effects. Robot mood was displayed by...
conference paper 2014
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Harbers, M. (author), Broekens, D.J. (author), Quillinan, T. (author), Van Riemsdijk, M.B. (author), Wijngaards, N. (author)
In crisis situations it is important that crisis response workers can quickly get access to the right information for the tasks they are required to undertake. A distinction can be made between getting the right information and having the rights to get that information. The first is an information filtering and relevance problem, the second is a...
conference paper 2012
document
Jacobs, E.J. (author), Broekens, J. (author), Jonker, C.M. (author)
In this paper we present a mapping between joy, distress, hope and fear, and Reinforcement Learning primitives. Joy / distress is a signal that is derived from the RL update signal, while hope/fear is derived from the utility of the current state. Agent-based simulation experiments replicate psychological and behavioral dynamics of emotion...
conference paper 2014
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Broekens, D.J. (author), Kosters, W.A. (author), De Vries, T. (author)
During the past several decades, much research has been done in the field of visual attention and cognitive processing, i.e., how does the human brain process visual stimuli. We show that the card game SET is a good candidate for investigating the relation between top-down versus bottom-up visual information processing. Further, we show that...
conference paper 2009
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Mu, D. (author), Pieras Sagardoy, M. (author), Broekens, Douwe (author), Marroquim, Ricardo (author)
While sailing, sailors rely on their eyes to inspect the sail shape and adjust the configurations to achieve an appropriate shape for a certain the weather condition. Mastering this so-called trimming process requires years of experience since the visual inspection of the sail shape suffers from inaccuracies and many times are difficult to...
conference paper 2021
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Moerland, T.M. (author), Broekens, D.J. (author), Jonker, C.M. (author)
In this paper we study how to learn stochastic, multimodal transition dynamics in reinforcement learning (RL) tasks. We focus on evaluating transition function estimation, while we defer planning over this model to future work. Stochasticity is a fundamental property of many task environments. However, discriminative function approximators have...
conference paper 2017
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Moerland, T.M. (author), Broekens, D.J. (author), Jonker, C.M. (author)
This paper studies directed exploration for reinforcement learning agents by tracking uncertainty about the value of each available action. We identify two sources of uncertainty that are relevant for exploration. The first originates from limited data (parametric uncertainty), while the second originates from the distribution of the returns ...
conference paper 2017
document
Dudzik, B.J.W. (author), Broekens, D.J. (author), Neerincx, M.A. (author), Hung, H.S. (author)
Empirical evidence suggests that the emotional meaning of facial behavior in isolation is often ambiguous in real-world conditions. While humans complement interpretations of others' faces with additional reasoning about context, automated approaches rarely display such context-sensitivity. Empirical findings indicate that the personal...
conference paper 2020
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Mania, J. (author), Miedema, F.E.G. (author), Browne, Rose (author), Broekens, D.J. (author), Oertel, Catharine (author)
Virtual agents are increasingly being used for communication training such as public speaking-, job interviews-, as well as negotiation training. In these use-cases the agent is generally taking on the role of interviewer and its behaviour is altered according to the nonverbal cues of its human interlocutor. However, understanding how the...
conference paper 2020
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Dudzik, B.J.W. (author), Hung, H.S. (author), Neerincx, M.A. (author), Broekens, Joost (author)
This paper contributes to the automatic estimation of the subjective emotional experience that audio-visual media content induces in individual viewers, e.g. to support affect-based recommendations. Making accurate predictions of these responses is a challenging task because of their highly person-dependent and situation-specific nature....
conference paper 2020
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Baghini, Mahdieh Shojaei (author), Broekens, Kristiaan (author), Oderwald, Michiel (author), Breedveld, P. (author), Heidari, Hadi (author), Van Der Heiden, Maurits (author)
Magnetostrictive strain sensors with high spinorbit coupling have been integrated with Fiber-Bragg-Grating sensors wherein the gap within the gratings varies with strain within the encapsulating magnetostrictive material. Terfenol-D has been chosen as the mm sized magnetostrictive material which exhibits the largest known bulk...
conference paper 2023
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Broekens, K.A. (author), Klop, Wimar (author), Moens, Thijs (author), Eschen, M. (author), Castro do Amaral, G. (author), Silverstri, Fabrizio (author), Visser, Martijn (author), Kaffa, Lauren (author), Saathof, R. (author)
For the next generation of very high throughput communication satellites, free-space optical (FSO) communication between ground stations and geostationary telecommunication satellites is a potential solution to overcome the limitations of RF links. To mitigate atmospheric turbulence effects, TNO proposes Adaptive Optics (AO) to apply uplink...
conference paper 2023
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Dudzik, B.J.W. (author), Jansen, Michel Pierre (author), Burger, Franziska (author), Kaptein, F.C.A. (author), Broekens, D.J. (author), Heylen, Dirk K.J. (author), Hung, H.S. (author), Neerincx, M.A. (author), Truong, Khiet P. (author)
An important aspect of human emotion perception is the use of contextual information to understand others' feelings even in situations where their behavior is not very expressive or has an emotionally ambiguous meaning. For technology to successfully detect affect, it must mimic this human ability when analyzing audiovisual input. Databases...
conference paper 2019
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Saad, E. (author), Broekens, D.J. (author), Neerincx, M.A. (author)
The design space of human-robot interaction is large and multi-dimensional. A sound design requires a systematic theory-driven exploration, specification and refinement of design variables. There is a need for a practical method and tool to iteratively specify the content of the dialogue (e.g., speech acts) with the accompanying expressive...
conference paper 2020
document
Dudzik, B.J.W. (author), Hung, H.S. (author), Neerincx, M.A. (author), Broekens, D.J. (author)
An essential part of being an individual is our personal history, in particular our episodic memories. Episodic memories revolve around events that took place in a person’s past and are typically defined by a time, place, emotional associations, and other contextual information. They form an important driver for our emotional and cognitive...
conference paper 2018
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Dudzik, B.J.W. (author), Broekens, D.J. (author), Neerincx, M.A. (author), Olenick, Jeffrey (author), Chang, Chu-Hsiang (author), Kozlowski, Steve W. J. (author), Hung, H.S. (author)
Combining self-reports in which individuals reflect on their thoughts and feelings (Experience Samples) with sensor data collected via ubiquitous monitoring can provide researchers and applications with detailed insights about human behavior and psychology. However, meaningfully associating these two sources of data with each other is difficult:...
conference paper 2018
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Saad, E. (author), Broekens, D.J. (author), Neerincx, M.A. (author), Hindriks, K.V. (author)
This paper presents the design and evaluation of human-like welcoming behaviors for a humanoid robot to draw the attention of passersby by following a three-step model: (1) selecting a target (person) to engage, (2) executing behaviors to draw the target's attention, and (3) monitoring the attentive response. A computer vision algorithm was...
conference paper 2019
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Pommeranz, A. (author), Broekens, J. (author), Wiggers, P. (author), Brinkman, W.P. (author), Jonker, C.M. (author)
Two problemsmay arisewhen an intelligent (recommender) system elicits users’ preferences. First, theremay be amismatch between the quantitative preference representations in most preference models and the users’ mental preference models. Giving exact numbers, e.g., such as “I like 30 days of vacation 2.5 times better than 28 days” is difficult...
journal article 2012
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Xu, J. (author), Broekens, D.J. (author), Hindriks, K.V. (author), Neerincx, M.A. (author)
The aim of our work is to design bodily mood expressions of humanoid robots for interactive settings that can be recognized by users and have (positive) effects on people who interact with the robots. To this end, we develop a parameterized behavior model for humanoid robots to express mood through body language. Different settings of the...
journal article 2015
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