Visual stimuli were presented on a desktop computer screen one metre away from the participant. Painful stimuli were electrical pulses delivered via a concentric electrode by a constant current stimulator (Digitimer DS5 2000, Digitimer Ltd., Welwyn Garden City, UK). The pulse width of the electrical stimulation was 5 milliseconds. All stimuli were controlled through a Matlab platform (Mathworks) which interfaced with the pain stimulator via a digital-to-analogue convertor (Multifunction I/O device, National instruments, Measurement House, Berkshire, UK). Participants submitted their intensity ratings of the pain using a keypad.
Ds5 2000
Manufactured by Digitimer
Sourced in United Kingdom
The Digitimer DS5 2000 is a versatile electrical stimulator designed for a variety of applications. It provides constant current or voltage stimulation with a wide range of adjustable parameters, including pulse width, frequency, and amplitude. The device is capable of delivering stimuli to multiple channels simultaneously.
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2 protocols using ds5 2000
1
Electrical Pain Stimulation Protocol
2
Aversive Electrical Skin Stimulation Protocol
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The amplitude of the electric skin stimulation, which served as the aversive reinforcer, was controlled by a Digitimer DS5, an Isolated Bipolar Constant Current Stimulator (Digitimer DS5 2000, Digitimer Ltd.) . The DS5 produces an isolated constant current stimulus proportional to a voltage applied at its input. For reasons of participant safety, this stimulator is limited to delivering a maximum of 10 V/10 mA. Participants received the stimulation through a ring electrode built in-house (Medical Physics, Salford Royal Hospital) attached to the DS5. To ensure adequate conductance between the electrode and the skin, the back of each participant's hand was prepared with Nuprep Skin Preparation Gel and Ten20 Conductive Paste before attaching the electrode. Transcutaneous electrical stimulation activates myelinated Aβ somatosensory fibers as well as Aδ nociceptive fibers (Hird, Jones, Talmi, & El-Deredy, 2018) and can therefore cause both a sensation of touch and a sensation of pain.
The experiment was implemented using the Psych toolbox on a MATLAB (The MathWorks, Inc.) platform. The voltage inputs to the DS5 were sent from MATLAB through a data acquisition interface (National Instruments). The behavioral ratings were taken on Microsoft Excel.
The experiment was implemented using the Psych toolbox on a MATLAB (The MathWorks, Inc.) platform. The voltage inputs to the DS5 were sent from MATLAB through a data acquisition interface (National Instruments). The behavioral ratings were taken on Microsoft Excel.
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