Magnetoencephalographic recordings of visual evoked brain activity in the human fetus.
We investigated the feasibility of recording visual evoked brain activity in the human fetus by use of non-invasive magnetoencephalography (MEG). Each recording lasted 6 min and consisted of a sequence of 180 flashes with 33 ms duration delivered 2 s apart over the maternal abdomen. Four of ten fetuses included showed a response; the ranges of amplitude and latency of peak response were 15-30 x 10(-15) Tesla and 180-390 ms, respectively. Six fetuses showed no discernible response. With improvement, this method could aid in the testing of fetal neurological status throughout pregnancy.
Eswaran
Hari
H
Department of Obstetrics and Gynecology, University of Arkansas for Medical Sciences, 4301 W Markham, Slot 518, Little Rock, AR 72205, USA.
Wilson
James
J
Preissl
Hubert
H
Robinson
Stephen
S
Vrba
Jiri
J
Murphy
Pam
P
Rose
Douglas
D
Lowery
Curtis
C
D001921:Brain / Q000502:physiology*; D005314:Embryonic and Fetal Development / Q000502:physiology*; D005074:Evoked Potentials, Visual / Q000502:physiology*; D006801:Humans; D015225:Magnetoencephalography