213 research outputs found
Vibrotactile Stimulus Frequency Optimization for the Haptic BCI Prototype
The paper presents results from a psychophysical study conducted to optimize
vibrotactile stimuli delivered to subject finger tips in order to evoke the
somatosensory responses to be utilized next in a haptic brain computer
interface (hBCI) paradigm. We also present the preliminary EEG evoked responses
for the chosen stimulating frequency. The obtained results confirm our
hypothesis that the hBCI paradigm concept is valid and it will allow for rapid
stimuli presentation in order to improve information-transfer-rate (ITR) of the
BCI.Comment: The 6th International Conference on Soft Computing and Intelligent
Systems and The 13th International Symposium on Advanced Intelligent Systems,
201
Multi-command Tactile Brain Computer Interface: A Feasibility Study
The study presented explores the extent to which tactile stimuli delivered to
the ten digits of a BCI-naive subject can serve as a platform for a brain
computer interface (BCI) that could be used in an interactive application such
as robotic vehicle operation. The ten fingertips are used to evoke
somatosensory brain responses, thus defining a tactile brain computer interface
(tBCI). Experimental results on subjects performing online (real-time) tBCI,
using stimuli with a moderately fast inter-stimulus-interval (ISI), provide a
validation of the tBCI prototype, while the feasibility of the concept is
illuminated through information-transfer rates obtained through the case study.Comment: Haptic and Audio Interaction Design 2013, Daejeon, Korea, April
18-19, 2013, 15 pages, 4 figures, The final publication will be available at
link.springer.co
Spatially Continuous Non-Contact Cold Sensation Presentation Based on Low-Temperature Airflows
Our perception of cold enriches our understanding of the world and allows us
to interact with it. Therefore, the presentation of cold sensations will be
beneficial in improving the sense of immersion and presence in virtual reality
and the metaverse. This study proposed a novel method for spatially continuous
cold sensation presentation based on low-temperature airflows. We defined the
shortest distance between two airflows perceived as different cold stimuli as a
local cold stimulus group discrimination threshold (LCSGDT). By setting the
distance between airflows within the LCSGDT, spatially continuous cold
sensations can be achieved with an optimal number of cold airflows. We
hypothesized that the LCSGDTs are related to the heat-transfer capability of
airflows and developed a model to relate them. We investigated the LCSGDTs at a
flow rate of 25 L/min and presentation distances ranging from 10 to 50 mm. The
results showed that under these conditions, the LCSGDTs are 131.4 1.9 mm,
and the heat-transfer capacity of the airflow corresponding to these LCSGDTs is
an almost constant value, that is, 0.92.Comment: 7 page
Automatic conversion of sentence-end expressions for utterance characterization of dialogue systems
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