Yes, anxiety can have a negative impact on scores. That being said, scores from a four year old are very unstable. Typically, there is not as robust a norming sample of four year olds, thus skewing the sample. Also,  there is still a lot of developmental differences among normally developing students at four years old at 6 these have started to even out.  Also, I am assuming the WAIS V was given based on the scores which has significantly updated norms compared to the SB 5.
Last edited by sallymom; 07/30/15 11:15 AM.