Somatosensory Feedback

Speech motor control makes use of various forms of somatosensory feedback alongside auditory feedback. Vibrotactile and proprioceptive feedback, in particular, are important contributors. An important facet of the research being conducted in the lab involves assessing effects of applying vibrotactile masking during speech.

Vibrotactile stimuli are presented with a Bruel & Kjaer 4810 mini shaker. A force transducer and accelerometer are placed against the neck, at the level of the thyroid lamina, to measure applied force and displacement. The masking signal delivered is typically a low-pass filtered stochastic signal covering frequencies of the human voice – 100 to 500 Hz.

 

Signal Conditioning: Meggitt 133. Provides a charge parameter for use with charge accelerometers like the Endevco Isotron devices.

A/D Conversion: LabJack U6. While we had previously used NI and MCC DAQ devices, the LabJack has proven to be a more flexible alternative, with a session-based interface and not requiring the Data Acquisition Toolbox for use with Matlab.

The following set-up is used: Hardware set-up SMS

You can get more information for each device via the following links

  1. LabJack U6 DAQ: https://labjack.com/products/u6
    1. DAQ Software: https://labjack.com/support/software/applications/ljstreamud
  2. Brüel & Kjær 2716C Power Amplifier: PA2716
  3. Brüel & Kjær 4810 Minishaker: BRUEL & KJAER 4810 Instruction or http://www.bksv.com/Products/shakers-exciters/exciters/small-exciter-type-4810?tab=overview
  4. Brüel & Kjær 8001 Impedance Head: Bruel & Kjaer 8001
  5. Endevco 2710-AM Accelerometer
  6. Meggitt 133 Signal Conditioner: https://www.endevco.com/133-3/
Hardware set-up is updated by Hyeju Han on Apr.25.2016.