Product Number: HMS-400

Acquisition and extinction of a conditional response to an aversive stimulus, typically an electric shock delivered to two fingers of one hand, are studied in this procedure.  The user selects the images to be presented – any of four geometric figures in any of six colors – which will be designated as S+ (the stimulus presentation which does not end in aversive stimulation) and which as S- (which is followed by aversive stimulation), and the duration of the aversive stimulus.  The sequence in which the visual stimuli are presented and the number of stimulus exposures in the session are user-specified. The software controls the separate subject monitor and finger shocker while acquiring data for ECG, SCR, and EMG modalities.

Product Number: HMS-500

This program is provided to allow the user to make changes in system parameters for each installed module of the Human Measurement System and to test the hardware and subject connections before beginning any of the procedures.  Sound level calibration for the Startle module is accomplished here as is the testing of the integrators used for EMG channels in all software modules.  System parameters such as the sensitivity and offset settings are determined and recorded, and values for the software filters for the ECG are entered in the Utilities module.  Other features allow for testing all channels of the A/D converter and testing the subject devices (video splitter, mouse splitter, finger shocker).