Paired tones or clicks are defined by an inter stimulus interval (ISI) between pairs of stimuli and the time between the first and second audio stimulus (ISI12). The ISI may be randomized while the time between the first and second audio stimulus is fixed and can not be randomized.
Pulsar
6 posts
In Pulsar the inter stimulus interval and the randomization of the interval can be set. The time set for the randomization is added to the inter stimulus interval. The total time between two subsequent stimuli is the sum of the duration of the tone, the ISI and the randomization time. […]
The shape of the tone can be set in Pulsar. Available parameters are the duration, fade in (rise) and fade out (fall) time and the frequency. All time related parameters are set in ms while the frequency can be changed in steps of 5 Hz.
Pulsar allows the modification of various parameters for each paradigm. For stimulation paradigm that use pure tones, the duration and fade in/out (rise/fall) time of tone, along with the frequency of the pitch can be set. The images below show various tones (1000 and 2000 Hz) with a duration of […]
In Pulsar, exact aligned of the onset of the audio with the corresponding triggers is an absolute necessity for reproducible auditory evoked potentials. High-speed microprocessors in Pulsar control the generation of the audio and the timing of the trigger events. Testing the time-sync of the audio and triggers can be […]
With Pulsar it is possible to set the exact frequency of the tone which is presented. To validate the frequency of the tone that was presented, the audio output of Pulsar was recorded again. The audio was recorded at 44100Hz sampling rate. Each tone was 500ms long to allow for […]