Background: Native Americans have same of the highest rates of alcohol abus
e and dependence, yet potential central nervous system risk factors respons
ible for the problem drinking seen in some tribes remain relatively unknown
.
Methods: Background electroencephalographic (EEG) variants and response to
alcohol were investigated in 48 Native American Mission Indian men between
18 and 25 years old.
Results: Subjects with 50% or greater Native American heritage had a signif
icantly higher proportion of low-voltage EEG variants. Within this sample o
f Mission Indian men however, a family history of alcohol dependence was as
sociated with a greater incidence of high-voltage alpha EEGs. Mission India
n men also evidenced a "less depressant, more stimulating" response to alco
hol as quantified by less alcohol-induced reductions in alpha greater EEG s
tability and increased alcohol-induced beta activity.
Conclusions: These findings demonstrate that certain genetically regulated
EEG variants that have been previously associated with risk for alcoholism
in Caucasians may also be more common in these Mission Indian men. Addition
ally, EEG measures of response to alcohol do not provide support for the co
mmonly held idea that Indians are more sensitive to the depressant effects
of alcohol. (C) 1999 Society of Biological Psychiatry.