Accession Number : ADA259024


Title :   A Toposcopic Investigation of Brain Electrical Activity Induced by Motion Sickness


Descriptive Note : Master's thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING


Personal Author(s) : Roblyer, Dwight A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259024.pdf


Report Date : Dec 1992


Pagination or Media Count : 186


Abstract : A toposcope was constructed as a new tool to study signal frequency and phase relationships in electroencephalogram (EEG) records collected while subjects were experiencing motion sickness. This new tool, named TOPOS, is a software-based, multi-featured version of Grey Walter and Harold Shipton's device which they first produced in the late 1940s. The TOPOS graphical display permits the study of instantaneous frequency relationships between the input channels and a reference signal of fixed or varying frequency. TOPOS adds a correlation grid to aid observers in detecting channel-to-reference correlation levels. Users can also vary several display parameters via menus to optimize the analysis environment. Sinusoidal test inputs of known frequency produced recognizable and predictable patterns on the TOPOS display, depending on the existing channel-to-reference frequency relationships. Motion-sickness-affected EEG was input to TOPOS in order to study the correlation between the displays of each channel and four separate references: a 1.5-Hz sinusoid, and three channels of the EEG itself. Rapidly varying correlations were observed in each case.... Toposcope, Brain Topographic Mapping, Motion Sickness, Electroencephalograph.


Descriptors :   *MOTION SICKNESS , *ELECTROENCEPHALOGRAPHY , TEST AND EVALUATION , FREQUENCY , INPUT , OBSERVERS , ENVIRONMENTS , BRAIN , PARAMETERS , GRIDS , MOTION , PHASE , CORRELATION , SIGNALS , PATTERNS , MAPPING , RECORDS , CHANNELS


Subject Categories : Medicine and Medical Research
      Stress Physiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE