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- AgeingPublication . d'Araújo, Maria Alexandra; Nunes, Maria Vânia Silva
- NeurosciencePublication . Caldas, Alexandre Castro
- BiomedicinePublication . Correia, Maria
- DentalPublication . Rosa, Nuno; Veiga, Nélio
- NursingPublication . Figueiredo, Amélia Simões
- HopePublication . Charepe, Zaida
- MedicinePublication . Almeida, António de
- EthicsPublication . Freitas, Mara de Sousa
- Multimodal visual, auditory, thermal, and tactile feedback during brain-machine interface use by a spinal cord injury patientPublication . Pais-Vieira, Carla; Gaspar, Pedro; Matos, Demétrio; Gago, Miguel; Azevedo, Maria João; Poléri, Tânia; Perrotta, André; Vieira, Miguel PaisThe aim of this study was to investigate the performance of a spinal cord injury (SCI) patient in a multimodal BMI setup. The participant was required to modulate neural activity (i.e., using lower limb motor imagery) to control an avatar in complex virtual reality scenarios, while receiving coherent visual, auditory, tactile, and thermal feedback. In the sessions presented here, the participant consistently presented performances above chance levels. In addition, the participant reported “feeling his feet cold” in scenarios involving water. This study demonstrates that a spinal cord injury patient can control a brain-machine interface combining virtual reality (visual and auditory), tactile, and thermal feedback; supporting the notion that the increased number of feedback modalities did not generate an overload of information and can be used in the context of rehabilitation.
- Monetary reward effects in discrimination and neurophysiological activity during use of a tactile stimulation sleevePublication . Pais-Vieira, Carla; Matos, Demétrio; Perrotta, André; Vieira, Miguel PaisThe development of devices capable of delivering tactile and thermal feedback have the potential to improve brain-machine interfaces for neurorehabilitation protocols. Monetary rewards are known to improve some types of passive tactile processing. The aim of this study was to describe the performance and neural activity of subjects receiving tactile stimuli through a tactile stimulation sleeve in the presence or absence of monetary rewards. Healthy subjects were required to discriminate between different tactile stimulation patterns delivered through a stimulation sleeve while their neural activity was recorded with Electroencephalography (EEG). Behaviorally, no significant differences were observed in the performances of subjects wearing the sleeve. Meanwhile, analysis of neural activity revealed that the introduction of monetary rewards consistently generated significant differences in theta frequency band for occipital electrodes. These results support the notion that monetary rewards can significantly influence tactile information processing.