@rautamiekka
While I think it was unintentional, that statement of yours is misleading.
While I think it was unintentional, that statement of yours is misleading.
Gyrification
A ‘gyrification index’ (GI) has been used as a measure of the magnitude of cortical convolutions on the surface of the mammalian brain. Reptile and bird brains do not show gyrification. Mammals with a high GI are generally larger than those with a low GI; for example the pilot whale and bottlenose dolphin show the highest GI values. The human brain, while larger than that of a horse, shows a similar GI.
What is true is that the GI‐to‐body‐mass ratio is significantly lower than that of humans. i.e., A horse’s brain is not as wrinkly as it would need to be compared to its body mass to be on par with humanity, unlike dolphins. (One would think the seemingly similar metric, GI‐to‐brain‐mass ratio, would be meaningful. It appears as though it’s not nearly as significant; a horse’s brain is wrinklier than both dolphins and humans under this metric yet horses are not remotely on par with either of us intellectually.)
