Spindle Neurons Found in Several Large-Brained Species

This article talked about the findings of spindle neurons in whales, which have relatively large brain. Spindle neurons have been thought by researchers to boost cognitive power such consciousness and emotions. The scientists were surprised to find these neurons in several large brained species that include humpback whale and fin whale. Moreover, these were found to be concentrated in the same regions of the brains as in primates. However, the spindle neurons were not found in brains of dolphins. By comparing the history of the evolution of spindle neurons, scientists estimate that the whale evolved spindle neurons between 22 million and 30 million years ago. Researchers also believed that these neurons are linked to the formation of cohesive social groups and complex communication such as singing in whales. More researches are being done to make sure spindle neurons have the same functions in both primates and whales and that whether other large brain animals contain these neurons.

For more information, here is the article:
http://sciencenow.sciencemag.org/cgi/content/full/2006/1127/1