In the part about cerebral palsy (contribution 5), they say they study only 7 patients with CP and 4 healthy people for control. This number is very, very small, no? With so few people, how you can be sure the results are true for most people with CP and not just something special for this 7? Maybe the effects they see is by chance or because of individual differences, not because of the disease.
Also, they find some differences in brain signals, but with such a small group, the statistical power must be very low. Is it possible they make a Type I or Type II error? Did they do any power analysis before to decide how many participants they need? Without this, it’s hard to trust if the findings is real or just random.
Maybe I miss something? Did they explain somewhere why the group is so small, or if they use some special method to compensate for this? Because if this is the main group for their conclusion, it seems like the whole finding about sensory processing in CP could be compromised.
What you think?