GMAT Reading Comprehension (RC) | Re: Researchers studying how genes control animal behavior have

If you read the passage, you'll notice the keyword "But ethologists..."

What was happening before? In the prior sentence, we were talking about NEUROSCIENTISTS. But now, we are talking about ETHOLOGISTS. They have DIFFERENT opinions.

What exactly is the difference? Well, later on, we see that ETHOLOGISTS do not consider Shaker a behavioral gene. Since ethologists and neuroscientists differ in the terms/scope of the word "behavioral gene" -- and ethologists do not consider