“…Altered brain neurochemistry: There are no studies in humans measuring brain neurochemistry after exposure to perc, in either children or adults. In experimental studies, altered brain neurochemistry has been observed after gestational exposure to rats (Nelson et al, 1979) and guinea pigs (Kyrklund and Haglid, 1991), as well as after adult exposure to rats (Honma et al, 1980a,b;Kyrklund et al, 1988Kyrklund et al, , 1990Savolainen et al, 1977;Wang et al, 1993) and gerbils (Karlsson et al, 1987;Kyrklund et al, 1984Kyrklund et al, , 1987Rosengren et al, 1986). These studies do not necessarily indicate increased effects on brain neurochemistry after gestational exposure compared to adult exposure.…”