Time-keeping brain neurons discovered

Time-keeping brain neurons discovered "The key finding is that neurons in the prefrontal cortex and the striatum encode the time information associated with sensory cues," Jin explained. "Visual cues, for example, elicit a variety of responses in a particular population of neurons. We found that the brain is able to tell the passage of time from the visual cues because different neurons are active at different times. Most remarkably we found that there are neurons that are active at precise times after a particular visual cue, and these neurons act like clocks that mark time."

...

"Another key finding of our work is that the brains of the monkeys constructed neural activities to encode time even though timing was not required for the experimental task," Jin said. "We suggest that time encoding is the essential function of the brain's neural networks."

Rare neurons discovered in monkey brains

The anterior insular cortex is a small brain region that plays a crucial role in human self-awareness and in related neuropsychiatric disorders. A unique cell type – the von Economo neuron (VEN) – is located there. For a long time, the VEN was assumed to be unique to humans, great apes, whales and elephants. Henry Evrard, neuroanatomist at the Max Planck Institute for Biological Cybernetics in Tübingen, Germany, now discovered that the VEN occurs also in the insula of macaque monkeys. The morphology, size and distribution of the monkey VEN suggest that it is at least a primal anatomical homolog of the human VEN. This finding offers new and much-needed opportunities to examine in detail the connections and functions of a cell and brain region that could have a key role in human self-awareness and in mental disorders including autism and specific forms of dementia.Rare neurons discovered in monkey brains