High pass filters attenuate the components of a signal below a certain frequency range. They help to remove lower frequency variation — possibly due to signals that are uninteresting in context — from data. For example, you can remove the respiratory component from ECG by running the data through a 1 Hz High Pass filter either in hardware (a setting on the amplifier) or in software (“Transform > Digital Filters > IIR > High Pass…”). The filter will center the signal around the zero line. The cutoff frequency of the filter provides an indication of what fruequencies are attenuated. Note that some energy at frequencies lower than the cutoff frequency will remain in the filtered signal.
Page last modified 29Dec2014
The ETVision (ETV) wearable eye tracking glasses resemble an eyeglasses frame that can be worn by itself or over the participant’s prescription eyeglasses. It contains miniature “eye cameras” that view each eye and a “scene camera” that views the scene in front of the participant, and a microphone. An optional visor can be mounted to […]
View AllDiscovering and understanding what motivates humans to produce better results has intrigued many researchers. Many researchers have explored the psychophysiological processes that drive our behavior. Here are some recent studies that have used BIOPAC systems to research motivation… Motivation and Pleasure Deficits Undermine the Benefits of Social Affiliation in Psychosis. Blanchard, J. J., Smith, J. […]
Eye tracking technology has come a long way and has enabled researchers to conduct mobile experiments and track participants in real world scenarios. These featured studies demonstrate some of the use cases for mobile eye tracking technology. Here are some recent studies that have used BIOPAC systems for eye tracking research… Drivers’ gaze patterns when resuming […]
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