Visual evoked magnetic fields to flash and pattern in 100 normal subjects

Richard A. Armstrong, A. Slaven, G.F. Harding

Research output: Contribution to journalArticle

Abstract

The practicality of recording visual evoked magnetic fields in 100 subjects 15-87 yr of age using a single channel d.c. SQUID second order gradiometer in an unshielded environment was investigated. The pattern reversal response showed a major positive component between 90 and 120 msec (P100M) while the response to flash produced a major positive component between 90 and 140 msec (P2M). Latency norms of the P100M were more variable than the corresponding P100 and P2 visual evoked potentials. The latency of the P100M may show a steep increase with age in most subjects after about 55 yr whereas only a small trend of latency with age was detected for the flash P2M.
Original languageEnglish
Pages (from-to)1859-1864
Number of pages6
JournalVision Research
Volume31
Issue number11
DOIs
Publication statusPublished - 1991

Keywords

  • neuromagnetism
  • norms
  • flash
  • pattern reversal
  • age

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