Thanks for sharing that!
Since smells are in fact chemicals, it could be an indication that the embryos are responding to chemical changes in the environment. It doesn't mean that the experience of fear
is actually occurring. When humans encounter a dangerous situation, it also triggers a rapid heart beat, increased perspiration and the hairs on the body become erect ( hence the term "hair raising") and all this occurs because the brain tells the adrenalin gland to give you a big does of juice. That juice is a molecular structure, and almost exactly the same as the molecules that are experienced as rage or anger.
However, these molecules only become experienced as
fear or anger by awareness, by some cognitive witness.
Otherwise, there is no experience. It is like the digestive juices in the stomach, or the blood in your heart. Unless something triggers an awareness of those juices (such as an upset stomach) there is no experience of digestion.
Similarly, when a tree falls in the forest, it causes the vibration of molecules. But if those moving molecules (or a played -back recording of those moving molecules) do not vibrate an eardrum and that vibration is not witnessed by awareness, there is no sound, but merely the causes
So, technically, without that experience, the embryos are not already sentient beings.
Or are they? They are living, but are they aware?
Is a brain-dead person whose body is still functioning, but who has no awareness, a sentient being?
That's opening a whole new can of worms.
Fish like worms.
When these fish hatch, they can eat the worms.
here is another link to that research:http://www.sciencealert.com.au/features ... 913-2.html