Affective interaction with a virtual character through an fNIRS brain-computer interface

Gabor Aranyi, Florian Pecune, Fred Charles, Catherine Pelachaud, Marc Cavazza

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

Affective brain-computer interfaces (BCI) harness Neuroscience knowledge to develop affective interaction from first principles. In this article, we explore affective engagement with a virtual agent through Neurofeedback (NF). We report an experiment where subjects engage with a virtual agent by expressing positive attitudes towards her under a NF paradigm. We use for affective input the asymmetric activity in the dorsolateral prefrontal cortex (DL-PFC), which has been previously found to be related to the high-level affective-motivational dimension of approach/avoidance. The magnitude of left-asymmetric DL-PFC activity, measured using functional near infrared spectroscopy (fNIRS) and treated as a proxy for approach, is mapped onto a control mechanism for the virtual agent's facial expressions, in which action units (AUs) are activated through a neural network. We carried out an experiment with 18 subjects, which demonstrated that subjects are able to successfully engage with the virtual agent by controlling their mental disposition through NF, and that they perceived the agent's responses as realistic and consistent with their projected mental disposition. This interaction paradigm is particularly relevant in the case of affective BCI as it facilitates the volitional activation of specific areas normally not under conscious control. Overall, our contribution reconciles a model of affect derived from brain metabolic data with an ecologically valid, yet computationally controllable, virtual affective communication environment.

Original languageEnglish
Article number70
JournalFrontiers in Computational Neuroscience
Volume10
Issue numberJULY
DOIs
Publication statusPublished - 2016 Jul 12
Externally publishedYes

Keywords

  • Affective computing
  • Brain-computer interfaces
  • FNIRS
  • Neurofeedback
  • Virtual agents

ASJC Scopus subject areas

  • Neuroscience (miscellaneous)
  • Cellular and Molecular Neuroscience

Fingerprint Dive into the research topics of 'Affective interaction with a virtual character through an fNIRS brain-computer interface'. Together they form a unique fingerprint.

Cite this