How to statistically analyse this experiment? Also confused about IVs/DVs, pls help!


I'm doing a hypothetical test, so if it doesn't make theoretical sense, just ignore please! :D

The study is longitudinal one lasting a year in which memory skills of children are assessed with a test quarterly. So at the start, 4 months, 8 months and at the end. The study is basically looking to see whether level of exercise and socialisation combined can effect their memory abilities

There are 5 conditions:
Control group
Low exercise, low socialisation
High exercise, low socialisation
low exercise, high socialisation
high ex, high socialisation

So each of these groups will complete the memory test four times. I wanna look for an relationship between the levels and the memory ability.
So for example, high levels of excercise mark an increase in memory abilities. Or a decrease.

Basically, I am massively confused and would appreciate some help SO MUCH.

I'm thinking that there's one DV, the difference in memory ability measured from start to finish.
The number of IVs confuses me... :/ So i'd appreciate some help there

Also if I were to analyse the outputs of these 5 groups memory tests in SPSS, what statistical thingy would be best?

Repeated measures due to the times...
ANOVA of some description...

Someone please please please help, I will be eternally indebted to you. Also, does having four collection points complicate it a lot? :confused: