[show abstract][hide abstract] ABSTRACT: An immediate need exists for a portable diagnostic device for the assessment of cortical function, and diagnosis of mTBI. This paper presents initial results using a vibrotactile acuity test for the objective and quantitative diagnosis of acute mTBI suspects. mTBI is hypothesized to involve derangement or damage to the underlying cortical network. In particular, fundamental building blocks of the cortex are changed in such a way as to limit the functional connectivity within and between cortical columns. Our approach is based on sensory illusions that are configured as a test of neural connectivity. Pilot clinical test data showed differences between a small healthy normal group and a concussion group using a sports concussion model.
Conference proceedings: ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference 08/2011; 2011:2041-4.
[show abstract][hide abstract] ABSTRACT: The sense of touch is an effective, but underutilized, human communication channel. In this paper we describe our research
efforts towards optimizing a minimal tactile array for personal navigation and route guidance. There are several aspects to
this problem. From an information transfer viewpoint, the question of tactor array size, dimension, location and display symbology
requires careful consideration. Effective tactile display symbology involves providing information in an intuitive manner
without adding to the cognitive loading of the user. Tactile information may be presented through spatial, temporal and signal
variables. We have recently developed new wearable tactors that offer wide sensory capabilities to provide different “feeling”
stimuli. These actuators are non-linear in that the salient characteristics for perception are linked to a complex drive stimulus.
We have therefore developed a tactor activation design approach termed “TActions” (Tactile Actions) where patterns or sequence
of individual tactile stimuli, each of which has its own characteristics and properties, are used to create tactile display
symbology that a user can naturally associate with a particular function. These components provide display design frame work
which we have used to demonstrate orientation and navigation.
Human-Computer Interaction. Towards Mobile and Intelligent Interaction Environments - 14th International Conference, HCI International 2011, Orlando, FL, USA, July 9-14, 2011, Proceedings, Part III; 01/2011
[show abstract][hide abstract] ABSTRACT: The body's sense of touch is potentially a versatile channel for the conveyance of directional, spatial, command, and timing information. Most practical implementations of vibrotactile systems require compact, light-weight actuators that can be mounted against the body. Eccentric mass motors are widely used for this application, yet their output is limited and the effects of loading on the transducers due to the skin and mounting arrangement have been largely ignored. Conventional linear actuators are well suited as vibrotactile transducers and can provide high output, but are typically limited to laboratory research due to their large size and cost. The effect of loading on various practical vibrotactile transducers is investigated using a skin impedance phantom and measuring the transducer displacement with respect to additional mass loading. Depending on the transducer design, loading can dramatically reduce the vibratory displacement and, in the case of eccentric mass motors, also increase the operating frequency. In contrast, a new linear actuator design can be designed to be almost independent of skin loading, by considering the mechanical impedance of the load and optimizing the transducer contact area.
The Journal of the Acoustical Society of America 06/2007; 121(5 Pt1):2970-7. · 1.65 Impact Factor