A link to articles on the topic of the defect of the septum in humans and swine :
https://www.ncbi.nlm.nih.gov/pubmed/6418034
Just happens that one of the authors is named Bacon.
Thank you for the reference. The authors discussed the physical aspects of development. I wonder if the affected fetuses ever have any awareness during their short lives, given that their brains are so severely malformed.