Measuring brain activity

Measuring Speech Activity

This report discusses the algorithm described in ITU-T Recommendation P.56 for measuring the active speech level. Method B in P.56 determines a speech activity factor representing the fraction of time that the signal is considered to be active speech (as opposed to background idle noise) and the corresponding active level for the speech part of the signal. The basic algorithm generates an envel...

Measuring antioxidant activity

Antioxidants are used in a wide variety of food products, and their activity may vary depending on the temperature, food composition, food structure and availability of oxygen. Temperatures at which antioxidant activity may be required range from 180–200°C for frying oils, to about 5 °C for products such as margarine or mayonnaise that are stored in the fridge. Besides the processing and storag...

Techniques for Measuring Brain Deformation

The oldest technique for measuring changes in brain size from MR scans is volumetry. Brain volumetry, at its most basic, involves using a mouse or similar device to draw around structures of interest in the brain, one slice at a time, at all the time points of interest, and count voxels within the boundaries to determine volume change between time-points. The limitations of this approach are fi...

Measuring autonomic nervous system activity

Measuring physical activity during pregnancy

BACKGROUND Currently, little is known about physical activity patterns in pregnancy with prior estimates predominantly based on subjective assessment measures that are prone to error. Given the increasing obesity rates and the importance of physical activity in pregnancy, we evaluated the relationship and agreement between subjective and objective physical activity assessment tools to inform re...