Study: Humpback whales have 'human' brain cells

[GrnMarvl14]

Original source.

WASHINGTON (Reuters) -- Humpback whales have a type of brain cell seen only in humans, the great apes, and other cetaceans such as dolphins, U.S. researchers reported on Monday.

This might mean such whales are more intelligent than they have been given credit for, and suggests the basis for complex brains either evolved more than once, or has gone unused by most species of animals, the researchers said.

The finding may help explain some of the behaviors seen in whales, such as intricate communication skills, the formation of alliances, cooperation, cultural transmission and tool usage, the researchers report in The Anatomical Record.

Patrick Hof and Estel Van der Gucht of the Department of Neuroscience at Mount Sinai School of Medicine in New York studied the brains of humpback whales and discovered a type of cell called a spindle neuron in the cortex, in areas comparable to where they are seen in humans and great apes.

Although the function of spindle neurons is not well understood, they may be involved in cognition -- learning, remembering and recognizing the world around oneself. Spindle cells may be affected by Alzheimer's disease and other debilitating brain disorders such as autism and schizophrenia.

The researches found spindle neurons in the same location in toothed whales with the largest brains, which the researchers said suggests that they may be related to brain size. Toothed whales such as orcas are generally considered more intelligent than baleen whales such as humpbacks and blue whales, which filter water for their food.

The humpbacks also had structures that resembled "islands" in the cerebral cortex, also seen in some other mammals.

These islands may have evolved in order to promote fast and efficient communication between neurons, the researchers said.

Spindle neurons probably first appeared in the common ancestor of hominids, humans and great apes about 15 million years ago, the researchers said -- they are not seen in lesser apes or monkeys.

In cetaceans they would have evolved earlier, possibly as early as 30 million years ago, the researchers said.

Either the spindle neurons were only kept in the animals with the largest brains or they evolved several times independently, the researchers said.

"In spite of the relative scarcity of information on many cetacean species, it is important to note in this context that sperm whales, killer whales, and certainly humpback whales, exhibit complex social patterns that included intricate communication skills, coalition-formation, cooperation, cultural transmission and tool usage," the researchers wrote.

"It is thus likely that some of these abilities are related to comparable histologic complexity in brain organization in cetaceans and in hominids."

Finally, more species have joined the spindle neuron club. Maybe they're smarter than we think, and are just screwing with our minds.

 

[McGraw]

Given that human brains have around 100 billion neurons, the comparable location of one type does not constitute much in terms of tangible intelligence. Orcas are not toothed whales, they are dolphins... lazy journalism. The repetitive use of "the researchers said" is annoying too.

It makes sense that toothed cetaceans on high protein diets have larger brains and exhibit more notable signs of intelligence than their filter feeding cousins. This is one of those cases where an unimaginative researcher finds exactly what he hypothesised. It does not take Darwin to draw a link between cooperative hunting behavior and a complex whale song with possible "intelligent" brain cells. Maybe if they could have said something more substantial about the function of spindle neurons, I would be less scathing, but this looks like a plea for research funding.

 

[GrnMarvl14]

"In spite of the relative scarcity of information on many cetacean species, it is important to note in this context that sperm whales, killer whales, and certainly humpback whales, exhibit complex social patterns that included intricate communication skills, coalition-formation, cooperation, cultural transmission and tool usage," the researchers wrote.

That's why it's a big deal. It's not simply cooperative hunting skills (sharks have cooperative hunting skills, hell...even ants do, it's hardly an indication of anything), it's a laundry list of functions limited to only a handful of species. They're not saying that humpback whales (which are filter feeders, hence why this particular story is of such merit) are suddenly far more intelligent, they're merely pointing out that a specific type of brain cell is found in many (if not all) of the animals that exhibit the complex and numerous types of behavior found in the list above.

And give me a science story that ISN'T a plea for more research dollars.

Wiki's Spindle Neuron page. And, of note, until 1999, it was thought that only humans had these. In 1999, they found great apes had them.