Methods and apparatuses in which attributes including one or more types of accents and one or more types of human languages from an audio information stream are identified. The system varies the placement of RFID tag and interrogator antennas with respect to each other and a stationary object or objects. Exemplary ECG features indicative of possible stroke include the onset of prominent U-waves, the onset of notched T-waves, and changes in ST segment duration or QT duration or dynamic trends in these parameters. Attribute data elements and values are provided to describe each to the assigned attributes for each search topic.