Although this is kind of a silly video, I think the dude has a point.
The 5 senses – especially touch – are extremely oversimplified.
Distinguishing proprioception (the ability to sense where you body parts are in space) as a separate sense seems very reasonable.
The Octopus is an interesting reference.
While they have a great sense of touch, octopi have a poor sense of proprioception.
Meanwhile they can taste stuff they touch.
An octopus’ suction cups are equipped with chemoreceptors so that the octopus can taste what it is touching.
Octopuses also don’t have stereognosis.
Meaning, they cannot “form a mental image of the overall shape of the object it is handling.”
They can “detect local texture variations, but cannot integrate the information into a larger picture.”
Maybe we should add this to the human tally as well…
We might learn a lot if the complexity of our senses was explained more thoroughly, and not in hard and fast categories.
And who’s to say out senses are a static reality. Evolution didn’t end with it’s discovery…