Cogno-Vest: A Torso-Worn, Force Display to Experimentally Induce Specific Hallucinations and Related Bodily Sensations

Fadaei, J. Atena; Jeanmonod, Kenny; Kannape, Olivier A.; Potheegadoo, Jevita; Bleuler, Hannes; Hara, Masayuki; Blanke, Olaf

doi:10.1109/tcds.2021.3051395

Cited by 10 publications

(9 citation statements)

References 40 publications

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“…Second, the design and control of force simulators are more problematic than vibrotactile stimulators. Thus, force stimulators require actual contact with the human skin to be perceived; moreover, as reported in our previous study with a force vest (Fadaei et al 2021), the solenoid's impact force might change in the range of 0.5-0.8 N, depending on the stroke length. Such effects could lessen the quality of force perception resulting in lower tactile perception with force stimulators.…”

Section: Study Limitationsmentioning

confidence: 69%

“…For the Vibrotactile vest, in case of failure in perceiving the vibrotactile stimuli, the experimenter improved the perception by better fitting the vest on the participant's torso. On the other hand, for the Force vest, the experimenter manually adjusted the force stimulator (solenoid) position at different stroke lengths until receiving verbal confirmation from the participant that they felt mechanical touch by each stimulator (more details can be found in (Fadaei et al 2021)). The calibration tasks for the Vibrotactile and Force vest lasted approximately 5 and 10 min, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The Force vest is torso-worn and can apply focal force stimuli to the back. It was designed and prototyped in our previous study (previously named Cogno-vest) (Fadaei et al 2021). It consists of nine (3 × 3) force stimulators (bi-directional, push-pull solenoid actuators; starting force: 5 N at 12 VDC, shaft length: 5.5 mm; shaft diameter: 5 mm; weight: 39 g), situated with an interstimulator distance of 60 mm on the back part of a tailormade, Y-harness brace (Fig.…”

Section: Force Vestmentioning

confidence: 99%

“…It also recorded participants' responses (i.e., entered via numeric keypad). In our earlier study (Fadaei et al 2021), the force stimulator (solenoid) performance was evaluated under various environmental and parametric conditions (e.g., the effects of the 3D-printed box, elastic tips, and stroke length). The results revealed that the realistic amount of force (average) provided by the Force vest is between 0.5 and 0.8 N depending on the stroke length (the force going up as the stroke length increases until 4 mm).…”

Section: Force Vestmentioning

confidence: 99%

“…Garcia-Valle et al (2018) showed that using a haptic vest, which presented vibration patterns, improves immersion in multimodal virtual reality environments. Other studies have recently employed force stimulators to present collision-type touch stimuli (e.g., force, pressure, and compression) on the participants' torso (Delazio et al 2018;Al-Sada et al 2019;Fadaei et al 2021). For instance, a force jacket was made of pneumatically actuated airbags to provide strong and variable forces to the torso along with vibrotactile sensations (Delazio et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Tactile spatial discrimination on the torso using vibrotactile and force stimulation

et al. 2021

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There is a steadily growing number of mobile communication systems that provide spatially encoded tactile information to the humans’ torso. However, the increased use of such hands-off displays is currently not matched with or supported by systematic perceptual characterization of tactile spatial discrimination on the torso. Furthermore, there are currently no data testing spatial discrimination for dynamic force stimuli applied to the torso. In the present study, we measured tactile point localization (LOC) and tactile direction discrimination (DIR) on the thoracic spine using two unisex torso-worn tactile vests realized with arrays of 3 × 3 vibrotactile or force feedback actuators. We aimed to, first, evaluate and compare the spatial discrimination of vibrotactile and force stimulations on the thoracic spine and, second, to investigate the relationship between the LOC and DIR results across stimulations. Thirty-four healthy participants performed both tasks with both vests. Tactile accuracies for vibrotactile and force stimulations were 60.7% and 54.6% for the LOC task; 71.0% and 67.7% for the DIR task, respectively. Performance correlated positively with both stimulations, although accuracies were higher for the vibrotactile than for the force stimulation across tasks, arguably due to specific properties of vibrotactile stimulations. We observed comparable directional anisotropies in the LOC results for both stimulations; however, anisotropies in the DIR task were only observed with vibrotactile stimulations. We discuss our findings with respect to tactile perception research as well as their implications for the design of high-resolution torso-mounted tactile displays for spatial cueing.

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Section: Study Limitationsmentioning

confidence: 69%

Section: Methodsmentioning

confidence: 99%

Section: Force Vestmentioning

confidence: 99%

Section: Force Vestmentioning

confidence: 99%