Recent quotes:

Monkeys' brains synchronize as they collaborate to perform a motor task: Levels of synchronicity in motor cortex are influenced by proximity, social status -- ScienceDaily

During one task, one monkey, called the passenger, sat in an electronic wheelchair programmed to reach a reward across the room, a fresh grape. A second monkey, the observer, was also in the room watching the first monkey's trajectory toward the reward. Electrical activity in the motor cortex of each monkey's brain was recorded simultaneously. An analysis showed that when the passenger traveled across the room under the attentive gaze of the observer, pools of neurons in their motor cortices showed episodes of synchronization. The researchers found these episodes of interbrain cortical synchronization (ICS) could predict the location of the passenger's wheelchair in the room, as well its velocity. The brain activity could also predict how close the animals were to each other, as well as the passenger's proximity to the reward. The most compelling finding, they said, was that ICS could predict another key social parameter -- the rank of the monkeys in the colony.

The brain's GPS has a buddy system -- ScienceDaily

It has been known for some time that the hippocampus maintains a mental map of space -- in fact, the 2014 Nobel Prize in Physiology or Medicine was awarded precisely for this research. 'Place cells' and 'grid cells' in the hippocampus register the location of the brain's owner in its environment, but until now, little was known about how the movements of others are tracked in the brain. Researchers put this to the test by observing the activity of hippocampal neurons in one rat (the 'self') watching another rat (the 'other') go through a simple T-maze. The self's neurons registered what the other was doing and changed their responses based on the self's location and subsequent actions. This study was published on January 11 in Science, which also contains a report of similar location awareness in the brains of bats.

Acting and thinking: Are they the same for our brain? -- ScienceDaily

"Why is the very same region important for so many different tasks? What is the relationship between motor skills, motor learning and the development of cognition in humans? These are the questions that lie at the heart of our research." A review of all the data currently available suggests that the tasks share a common process, which the scientists have termed "emulation." This process, which consists of planning and representing a movement without actually performing it, activates the brain network in the same way as real movements. "But we hypothesise that the brain goes a step further," explains Dr Ptak: "It uses such dynamic representations to carry out increasingly complex cognitive functions beyond just planning movements."

Bird contagion

This week, scientists report that New Zealand parrots can spread positive emotion, too — or at least behaviour that could indicate their state of mind. The researchers recorded the play calls of keas (Nestor notabilis) and played them back to groups of wild keas. When the birds heard the sounds, they played more vigorously and longer — certainly more than when they heard the calls of a South Island robin (Petroica australis). The calls did not, however, seem to act as an invitation to join existing birds at play. Some keas that heard them preferred to start their own play — typically embarking on feats of aerial acrobatics. With self-confessed anthropomorphism, the scientists suggest that the play calls of these birds act in the same way as infectious laughter in people (R. Schwing et al. Curr. Biol. 27, R213–R214; 2017). In its homeland, the playful kea is called the clown of the mountains. And as every good clown knows: cry and you cry alone. But laugh and the world laughs with you.