The vocal folds are connected to the larynx by the arytenoid cartilage at the front, while leaving the other ends free. The opening between the vocal folds (glottis) allows air to flow freely through the glottis (when relaxed), or causes air vibration as it passes through the glottis (when tensed) due to the link to the “emotional” center of the brain. LVA is based on the detection of emotions. LVA measures this “manifested cortical activity” and makes certain determinations based on the analysis of the voice. LVA uses a series of rather complex signal processing algorithms to identify different emotional levels. The resulting analysis can be viewed in terms of different layers or levels of memory retrieval by use of "psychological pattern" detection based on three different and independent equations.