Computational Intelligence and Neuroscience / 2011 / Article / Fig 1

Research Article

TopoToolbox: Using Sensor Topography to Calculate Psychologically Meaningful Measures from Event-Related EEG/MEG

Figure 1

Illustration of angle test and projection test with 2 sensors, although the technique is typically applied to an n-dimensional sensor space where n is the number of sensors. Each experimental condition ( 𝑋 1 and 𝑋 2 ) produces a magnitude of response for each sensor. The angle ( 𝜃 ) between these conditions is used as a measure of pattern similarity. Some other condition defines a template pattern ( 𝑇 ), and projections onto this template provide numbers for “how much” of the template each condition produced. These response magnitudes can then be compared across individuals.