It isn't unusual for gifted kids to have slow processing speed. Many kids on this board have a similar spread, including my dd 12 DYS who has about 50 pts between her VCI and her PSI. My son has a 60 pt spread. GAI takes out PSI and WMI and only uses the PRI and VCI. PRI and VCI are better measures of g. I am sure others will chime in who can explain it better!