Accession Number : ADA134575

Title :   ERG (Electroretinogram) Implicit Time: An Exploration of High Frequency Wavelets Recorded in the Human Visual System.

Descriptive Note : Final rept. 10 May 79-9 May 83,

Corporate Author : PENNSYLVANIA COLL OF OPTOMETRY PHILADELPHIA HAFTER VISION RESEARCH LAB

Personal Author(s) : Siegfried,John B

PDF Url : ADA134575

Report Date : 15 Oct 1983

Pagination or Media Count : 26

Abstract : Previous research by the author had demonstrated that the spectral sensitivity of the visual system as measured by the visual evoked potential from the human scalp exhibited discrepancies from the spectral sensitivity function as measured by psychophysical techniques. These discrepancies were in the short wavelength (blue) region of the visible spectrum. Such discrepancies were explained by the discovery that blue lights evoked cortical potentials with longer latencies and implicit times than lights which stimulate the middle and long wavelength sensitive mechanisms. The current research deals with a further elucidation of this finding, by studying the fast wavelets (oscillatory potentials) arising in the retina and measured by means of the electroretinogram. High frequency wavelets were also observed at the scalp in the visual evoked potential.

Descriptors :   *Vision, *Electroretinography, Humans, Sensitivity, High frequency, Waveforms, Digital filters, Analog systems, Signal to noise ratio

Subject Categories : Psychology
      Anatomy and Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE