New study proves absence really does make the heart grow fonder

This is one of countless studies that prove the positive impact of social connection and intimacy while highlighting the negative impact of isolation and separation.

concept of love neurons what happens in the brain when we are reunited with loved ones

What happens in the human brain when we are reunited with the ones we love?

Image by magic pictures on Shutterstock
  • New research, led by behavioral neuroscience assistant professor Zoe Donaldson explores what drives our mammalian instinct to create lasting bonds - and what exactly happens when we are apart from people we share those bonds with.
  • Studying prairie voles (who fall under the 3-5% of mammals who, along with humans, are monogamous), Donaldson and her team discovered a unique set of cluster cells that light up when reunited with a mate after a period of separation.
  • This study is just the tip of new developing research that could lead to groundbreaking new therapies for individuals who struggle with these types of connections, including people with autism, people who struggle with mood disorders, etc.

Assistant professor of behavioral neuroscience at CU Boulder Zoe Donaldson has recently led a year-long study of prairie voles, who are in the 3-5% of mammals (along with humans) who tend to mate for life.

"In order to maintain relationships over time, there has to be some motivation to be with that person when you are away from them. Ours is the first paper to pinpoint the potential neural basis for that motivation to reunite," explains Donaldson.

What drives the mammalian instinct to create lasting bonds? This was the question Donaldson and her team sought out an answer for. And not an answer based on philosophy or emotion, but an answer based on neuroscience and hard-proof.

        The study

        two prairie voles concept of mating for life monogamous mammals

        This research ground lead to new therapies for individuals who struggle with this kind of emotional connection.

        Photo by torook on Shutterstock

        Donaldson and her team used tiny cameras and a new technology called in-vivo-calcium imaging to analyze the brains of prairie voles at three separate times:

        1. During their first encounter with another vole
        2. Three days after mating with another vole
        3. 20 days after living in the same area as the mate

        When the voles were together in the same area, their brains looked and reacted the same way. However, after separating the voles, it was discovered that a unique cluster of cells in the nucleus accumbens fired up when they were reunited.

        In fact, the study proved that the longer the voles had been paired before being separated, the closer their bond became and the glowing cluster that lit up became stronger during their reunion.

        It's interesting to note that a whole different cluster of cells lit up upon them being introduced to a stranger vole, suggesting that these specific cells may actually be there for the purpose of forming and maintaining bonds with others.

        This study confirms that monogamous mammals (voles and humans alike) are very uniquely hard-wired to mate with others. We have a unique biological drive that urges us to reunite with people we care for, and this drive can be one of the reasons we fall under the 3-5% of mammals that seek out monogamy.

        What does this mean for the future of human behavior studies?

        As far as research goes, this is quite groundbreaking - as this could potentially give us insight into various kinds of therapies for individuals who are autistic or individuals who struggle with severe depression and/or other disorders that make these kinds of emotional connections difficult.

        There is still much to learn about these specific series of events that happens when we're reunited with a mate after a period of separation. For example, it's unclear if this "neuronal code", so to speak, is associated with emotion in humans the same way it is associated with desire in voles.

        According to Donaldson, the research in this department is only just beginning, and the definitive outcome of this study is that mammals are quite literally hardwired to be monogamous mammals.

        Social connection and intimacy is essential to our growth and development

        This isn't the first time a study like this has been conducted, even though this particular study has unveiled new neuronal clusters that had not been previously accounted for.

        There have been many other studies of mammals (from small rodents all the way up to human beings) that suggest we are not only hardwired to seek out intimate connections through monogamy, but that we are also extremely and profoundly shaped by (and perhaps even dependent upon) the experiences we have with those mates.

        Brene Brown, a University of Houston Graduate College of Social Work (who specializes in social connection), explains:

        "A deep sense of love and belonging is an irresistible need of all people. We are biologically, cognitively, physically, and spiritually wired to love, to be loved, and to belong. When those needs aren't met, we don't function as we were meant to."

        This idea is backed up by countless studies, including Dr. Helen Fischer's revolutionary study back in 2005, which included the very first fMRI images of "the brain in love".

        This study concluded that the human brain doesn't just work to amplify positive emotions when we experience romantic love, but that the neural pathways responsible for negative emotions (such as fear and anxiety) are actually deactivated.

        This is what aliens would 'hear' if they flew by Earth

        A Mercury-bound spacecraft's noisy flyby of our home planet.

        Image source: sdecoret on Shutterstock/ESA/Big Think
        Surprising Science
        • There is no sound in space, but if there was, this is what it might sound like passing by Earth.
        • A spacecraft bound for Mercury recorded data while swinging around our planet, and that data was converted into sound.
        • Yes, in space no one can hear you scream, but this is still some chill stuff.

        First off, let's be clear what we mean by "hear" here. (Here, here!)

        Sound, as we know it, requires air. What our ears capture is actually oscillating waves of fluctuating air pressure. Cilia, fibers in our ears, respond to these fluctuations by firing off corresponding clusters of tones at different pitches to our brains. This is what we perceive as sound.

        All of which is to say, sound requires air, and space is notoriously void of that. So, in terms of human-perceivable sound, it's silent out there. Nonetheless, there can be cyclical events in space — such as oscillating values in streams of captured data — that can be mapped to pitches, and thus made audible.

        BepiColombo

        Image source: European Space Agency

        The European Space Agency's BepiColombo spacecraft took off from Kourou, French Guyana on October 20, 2019, on its way to Mercury. To reduce its speed for the proper trajectory to Mercury, BepiColombo executed a "gravity-assist flyby," slinging itself around the Earth before leaving home. Over the course of its 34-minute flyby, its two data recorders captured five data sets that Italy's National Institute for Astrophysics (INAF) enhanced and converted into sound waves.

        Into and out of Earth's shadow

        In April, BepiColombo began its closest approach to Earth, ranging from 256,393 kilometers (159,315 miles) to 129,488 kilometers (80,460 miles) away. The audio above starts as BepiColombo begins to sneak into the Earth's shadow facing away from the sun.

        The data was captured by BepiColombo's Italian Spring Accelerometer (ISA) instrument. Says Carmelo Magnafico of the ISA team, "When the spacecraft enters the shadow and the force of the Sun disappears, we can hear a slight vibration. The solar panels, previously flexed by the Sun, then find a new balance. Upon exiting the shadow, we can hear the effect again."

        In addition to making for some cool sounds, the phenomenon allowed the ISA team to confirm just how sensitive their instrument is. "This is an extraordinary situation," says Carmelo. "Since we started the cruise, we have only been in direct sunshine, so we did not have the possibility to check effectively whether our instrument is measuring the variations of the force of the sunlight."

        When the craft arrives at Mercury, the ISA will be tasked with studying the planets gravity.

        Magentosphere melody

        The second clip is derived from data captured by BepiColombo's MPO-MAG magnetometer, AKA MERMAG, as the craft traveled through Earth's magnetosphere, the area surrounding the planet that's determined by the its magnetic field.

        BepiColombo eventually entered the hellish mangentosheath, the region battered by cosmic plasma from the sun before the craft passed into the relatively peaceful magentopause that marks the transition between the magnetosphere and Earth's own magnetic field.

        MERMAG will map Mercury's magnetosphere, as well as the magnetic state of the planet's interior. As a secondary objective, it will assess the interaction of the solar wind, Mercury's magnetic field, and the planet, analyzing the dynamics of the magnetosphere and its interaction with Mercury.

        Recording session over, BepiColombo is now slipping through space silently with its arrival at Mercury planned for 2025.

        Learn the Netflix model of high-performing teams

        Erin Meyer explains the keeper test and how it can make or break a team.

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        • There are numerous strategies for building and maintaining a high-performing team, but unfortunately they are not plug-and-play. What works for some companies will not necessarily work for others. Erin Meyer, co-author of No Rules Rules: Netflix and the Culture of Reinvention, shares one alternative employed by one of the largest tech and media services companies in the world.
        • Instead of the 'Rank and Yank' method once used by GE, Meyer explains how Netflix managers use the 'keeper test' to determine if employees are crucial pieces of the larger team and are worth fighting to keep.
        • "An individual performance problem is a systemic problem that impacts the entire team," she says. This is a valuable lesson that could determine whether the team fails or whether an organization advances to the next level.
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