I don’t know about chickens, but Zebra Finch’s have presented some interesting insights.
St. Louis researcher Wes Warren from Washington University’s Genome Sequencing Center was interviewed about his latest findings on the Zebra Finch appearing in this Months Journal Nature.
Warren has demonstrated a different mechanism than mere “interactions of neurons within the brain”. He seems to have discovered what causes those interactions to occur.
“We show that song behaviour engages gene regulatory networks in the zebra finch brain, altering the expression of long non-coding RNAs, microRNAs, transcription factors and their targets. We also show evidence for rapid molecular evolution in the songbird lineage of genes that are regulated during song experience. These results indicate an active involvement of the genome in neural processes underlying vocal communication and identify potential genetic substrates for the evolution and regulation of this behavior.”
The implications of this are staggering, as “The zebra finch is an important model organism in several fields1, 2 with unique relevance to human neuroscience3, 4. Like other songbirds, the zebra finch communicates through learned vocalizations, an ability otherwise documented only in humans and a few other animals…”
We once again find another use for the so called Junk DNA. It seems that when the Zebra Finch expresses a DESIRE to sing, that desire causes a change in sequence of the “long non-coding RNAs, microRNAs, transcription factors and their targets.” And thereby, a change in that sequence, is the very mechanism which causes the “interactions of neurons within the brain”.
“Two of the cDNA clones that measured the most robust increases27 align to an unusually long (3 kilobases (kb)) 3′ untranslated region (UTR) in the human gene that encodes the NR4A3 transcription factor protein (Fig. 4a). The entire UTR is similar in humans and zebra finches, with several long segments of >80% identity”
“These findings indicate that this NR4A3 transcript element may function in both humans and songbirds to integrate many conserved microRNA regulatory pathways.”
“It has been proposed that ncRNAs have a contributing role in enabling or driving the evolution of greater complexity in humans and other complex eukaryotes32. Seeing that learned vocal communication itself is a phenomenon that has emerged only in some of the most complex organisms, perhaps ncRNAs are a nexus of this phenomenon.”
As well, we have discovered Primate Olfactory genes in human pseudogenes. They are turned off, but they are there nonetheless.
My point being, there is much more to consider than brain activity for inherited information. The information is in the genes. And the pseudogenes are demonstrated to control the brain activity.