Prophetic Rodents: Neuroscientists Find Hints That Rats Dream of the Future

imgres-1New findings from brain researchers at University College London in the U.K. suggest that sleeping rats have the capacity to imagine a place they have never been in waking. This intriguing study does more than support the idea that many animals do indeed dream, in modes appropriate to the neural capacities and environmental experiences of their species. Beyond that, the study shows that rat dreams may have one of the key features of human dreaming, namely the ability to simulate future scenarios and prepare for anticipated efforts to achieve our goals.

Titled “Hippocampal place cells construct reward related sequences through unexplored space” and published in eLife on June 26, the researchers built on previous work showing the importance of the hippocampus in remembering places and forming mental maps of where we have been. The hippocampus is also important for imagination, forethought, and planning future goals. Crucially for this study, the hippocampus is active in waking and sleeping, and researchers have long known that the same hippocampal “place neurons” triggered into firing by a waking-life experience of a particular place will also fire during sleep. The challenge of this study was to find out if hippocampal neurons associated with a place will fire in sleep before any waking experience of the creature actually being in that place. In other words, will the sleeping brain anticipate a desired action? Will it dream of the future?

The experiment involved training rats (with electrodes implanted in their brains) to run through a maze where they could see, but not reach, another chamber where food was visibly located. The rats could also see but not reach an additional chamber with no food. During rest periods, the researchers recorded the rats’ hippocampal activity. Then the researchers let the rats run through the maze with no blockages, so they could reach the new chambers. It turned out the rats’ hippocampal activity when they first entered the new chamber with food was a close match with their hippocampal activity in sleep—the same place neurons that first fired in sleep later fired in waking life, too. The rats seemed to dream of going into that chamber before they actually did so.

The same effect was not found in relation to the chamber with no food. The preceding rest period did not include any hippocampal activity related to the rats’ later experiences in that place. This finding led the researchers to stress the significance of desire and intrinsic motivation in triggering this “preplay” effect.

The ultimate conclusion of the study was that “goal-biased preplay may support preparation for future experiences in novel environments.” These results give us a better understanding of how preplay, or imagination in a more general sense, can “simulate future experiences in environments yet to be actively explored,” in humans and in other species.

The limits of this research are considerable. Only four rats were used as participants; the periods of “rest” were not clearly sleep stages of any specific kind; and the published results depended on an extremely technical analysis that could allow for many hidden errors. These limits should add a note of caution when assessing the possible implications of the research.

That being said, the findings of this study have a clear affinity with theories of dream function that emphasize the values of the anticipatory simulations frequently occurring in dreaming experience. C.G. Jung spoke of “the prospective function” of dreams, Montague Ullman said dreaming worked to maintain an optimal state of “vigilance,” Frederick Snyder viewed sleep and dreaming as a “sentinel” system to prepare for environmental danger, Rosalind Cartwright argued that dreams serve as “rehearsals” for future actions, and Jeremy Taylor has focused on recurrent nightmares as warnings of psycho-spiritual danger in the dreamer’s waking life. Antti Revonsuo and Katja Valli have been developing the “Threat Simulation Theory” as a way of connecting typical patterns in dream content with brain functioning and the evolutionary challenges of our species. In my 2016 book Big Dreams: The Science of Dreaming and the Origins of Religion, I will talk at length about the capacity for creative forethought and visionary insight in dreaming.

All of which is to say, dream researchers from other areas have been working with similar ideas for years, and these new findings from the University College London team are a welcome addition to the accumulating evidence in favor of dreams having some kind of preparatory function that helps to orient the individual toward successful adaptation in the waking world.

Ben Carson’s Illuminating Dream

imgresBen Carson, the retired neurosurgeon and leading Republican contender for the Presidency, says that his life was changed by a shadowy figure who appeared in a dream and gave him special advice at a time of crisis. Not since Barack Obama’s 2004 memoir Dreams From My Father has a presidential candidate shared such valuable insight into his personal dreaming experience.

Carson’s 2009 autobiography Gifted Hands describes a pivotal moment during college when he was threatened with paralyzing doubt about his ability to reach the ambitious goal he had set himself, to become a doctor. Having escaped a dysfunctional family and a poor, crime-ridden neighborhood, Carson was a freshman at Yale University in the pre-med program. He felt overwhelmed by the difficulty of his classes and the competitive pressures from all the other super-bright, hyper-achieving students. Chemistry became a serious problem, and as the end of first semester approached Carson realized he was very likely to fail the class. That would knock him out of the pre-med program and ruin his plans for the future. The day before the exam he wandered about campus in deep despair, consumed by guilt and anxiety. Finally, he says, he prayed:

“My mind reached toward God—a desperate yearning, begging, clinging to Him. ‘Either help me understand what kind of work I ought to do, or else perform some kind of miracle and help me to pass this exam.’” (72)

Once he placed the matter in God’s hands, Carson says he “felt at peace” (72). He commenced to study as hard as he could in the few hours remaining before the test—“I scribbled formulas on paper, forcing myself to memorize what had no meaning to me.” (73) When midnight came, Carson “flopped into my bed and whispered in the darkness, ‘God, I’m sorry. Please forgive me for failing You and for failing myself.’ Then I slept.” (73)

And then comes the dream that changed his life:

“While I slept I had a strange dream, and, when I awakened in the morning, it remained as vivid as if it had actually happened. In the dream I was sitting in the chemistry lecture hall, the only person there. The door opened, and a nebulous figure walked into the room, stopped at the board, and started working out chemistry problems. I took notes of everything he wrote.” (73)

When he woke up, Carson quickly wrote down all the problems he could remember, even though the final few faded away before he could record them. He looked up the problems in his textbook, figuring that his mind “was still trying to work out unresolved problems during my sleep.” (74)

But what happened next made him question the prosaic explanations of psychology. He went to the chemistry lecture hall, took his seat, and waited with 600 other students for the teacher to pass out the exam booklet.

“At last, heart pounding, I opened the booklet and read the first problem. In that instant, I could almost hear the discordant melody that played on TV with The Twilight Zone. In fact, I felt I had entered that never-never land. Hurriedly, I skimmed through the booklet, laughing silently, confirming what I suddenly knew. The exam problems were identical to those written by the shadowy dream figure in my sleep.” (74)

Without pausing to reflect on the strangeness of what was happening, he set to work on the exam, going as fast as he could so he would not forget the information he had received in his dream. “God, You pulled off a miracle,” he said as finished the test and left the lecture hall.

Once again he wandered the campus, this time in wonder and elation, urgently trying to make sense of things.

“I’d never had a dream like that before. Neither had anyone I’d ever known. And that experience contradicted everything I’d read about dreams in my psychological studies. The only explanation just blew me away. The one answer was humbling in its simplicity. For whatever reason, the God of the universe, the God who holds galaxies in His hands, had seen a reason to reach down to a campus room on Planet Earth and send a dream to a discouraged ghetto kid who wanted to become a doctor. I gasped at the sure knowledge of what had happened.” (75)

Carson passed the exam with a score of 97. The only problems he got wrong were the ones at the end, when his memory of the dream had begun to fade. From that point on his path toward a stellar medical career never faltered, and by the age of 33 he had become director of pediatric neurosurgery at Johns Hopkins Medical Institutions.

But the significance of Carson’s miraculous dream extended far beyond helping him become a doctor. After this experience he was confident that God “had special things for me to do… I had an inner certainty that I was on the right path in my life—the path God had chosen for me. Great things were going to happen in my life, and I had to do my part by preparing myself and being ready.” (76)

What should we make of this story? First of all, we have to ask if he made the whole thing up. Aspiring politicians embellish their biographies all the time. It’s a rather neat little vignette, perfectly suited for a mass-market book. Carson had plenty to gain, and nothing to lose, by fabricating this feel-good tale of a dream of salvation.

Of course there is no direct way to validate the details of his experience. However, there are many indirect reasons, based on current scientific dream research, to indicate that what Carson described was not impossible but actually has some degree of plausibility. Setting aside his theological interpretation for a moment, we can look at the basic contours of Carson’s dream and identify several features that reflect well-known aspects of cognitive functioning during sleep.

To start, dream recall increases for many people during times of personal crisis. As clinical psychologists have long known, intensified dreams tend to emerge when a person is struggling with turbulent emotions and a fragile sense of identity. Increased dreaming is especially likely for people who perform pre-sleep prayers like Carson did the night before his dream. “Dream incubation” is the general term for rituals aimed at stimulating a revelatory dream, and religions all over the world have developed special techniques for this purpose. Modern researchers have found that if people go to sleep with an urgent question or concern in mind, they are highly likely to dream about it that night.

Indeed, those are the conditions that can generate a “big dream,” meaning a dream with unusual vividness, realism, and memorability. Carson’s experience would certainly qualify as a big dream in that sense.

Dreaming about a test or exam is among the most common types of recurrent dream. It has a history reaching back to ancient China and the dreams people many centuries ago had about passing, or failing to pass, the all-important civil service exams. People today often have exam nightmares long after they have been out of school, more evidence of the deep emotional power of these kinds of dreams.

There should be nothing surprising, then, about a college student who is very anxious about a test having a dream that relates directly to his waking concerns.

Although he later dismissed it, Carson’s initial psychological analysis of the dream has some merit. It seems likely that, after all that intense studying, he went to sleep and his unconscious mind made various connections that his conscious waking mind had not yet processed. The exam questions seemed familiar because it turned out that he actually understood the material much better than he thought he did. It would have been a much more miraculous story if he had received this dream and done well on the test without doing any studying beforehand.

In light of all this, we can recognize a plausible naturalistic core to Carson’s experience. We still cannot say with certainty that he really had this exact dream, but everything he described has a realistic basis in current scientific knowledge about sleep and dreaming.

Carson felt, however, that a naturalistic explanation of his dream was not enough. He adopted a theological interpretation that cast himself as a quasi-biblical figure of divinely sanctioned destiny. Strangely, he never said anything more about the “nebulous figure” who revealed the chemistry problems, and in most Christian contexts this would be a huge red flag. Any number of demonic temptations can enter people’s minds through dreams, and a “shadowy” character like the one in Carson’s dream would automatically be a target of suspicion. But Carson never has a moment’s doubt about the reliability of his mysterious dream teacher, trusting in the ultimate goodness of his desire to become a doctor. If the dream helped him reach that goal, it must be a dream from God.

Carson’s miraculous exam dream stands in dramatic contrast to the two dreams described by Barack Obama in his first book, Dreams From My Father. Obama’s dreams revolved around struggles with his complicated family history and efforts to reconcile himself with the haunting influence of his father. Both dreams occurred during a time of major life transition (after the death of his father, and on a journey to Africa to visit his father’s village), and both dreams are suffused with dark emotions of fear, anger, and sadness. Obama’s dreams led him to a more humble self-awareness of the enduring power of his family lineage, for good and for ill. In 2008, before Obama was elected, I wrote that a close look at these dreams “suggests that Obama is perhaps more temperamentally conservative and respectful of paternal authority than most Americans assume.”

Whereas Obama’s dreams had the effect of anchoring him more deeply in the communal traditions of his ancestors, Carson’s dream, or at least his interpretation of it, had the effect of elevating himself to a position of singular cosmic importance. It would not be too strong to say that Carson feels he is on a mission from God, a mission first revealed to him in a heaven-sent dream.

####

Note: This essay was first published in the Huffington Post on November 2, 2015. http://www.huffingtonpost.com/kelly-bulkeley-phd/ben-carsons-illuminating-_b_8443254.html

Big Data and the Study of Religion: Can a Google Search Lead to God?

Google religionA recent essay in the Sunday Review Section of the New York Times made several observations about religion in contemporary America by analyzing a huge collection of Google search data. In “Googling for God,” economist Seth Stephens-Davidowitz examined the search results for various religious terms and questions in relation to where the people lived and when they performed the searches. Stephens-Davidowitz’s work offers an excellent illustration of the pros and cons of using big data analytics to study religion. Three quotes from his essay show where the biggest challenges can be found.

  1. “If people somewhere are searching a lot about a topic, it is overwhelming evidence those people are very interested in that topic.”

This is the key methodological principle used in Stephens-Davidowitz’s analysis: the frequency of Google searches correlates to the intensity of personal interest. At one level this seems like a reasonable premise. In fact, this principle is very close to the “continuity hypothesis” used by dream researchers to correlate frequencies of dream content with personal concerns in waking life. Many dream researchers, myself included, have pursued studies of dream content using the continuity hypothesis to make inferences about people’s waking lives—if a person dreams a lot about sports, for example, we can confidently predict that sports are an important concern in the person’s waking life.

Stephens-Davidowitz does something similar when he connects Google search data to people’s religious concerns and questions. The problem, however, is defining “very interested.” What exactly can we infer about a person based on their entry of a Google search term? They are “interested,” of course, but interested in what way, and how strongly? What prompted their search? Is there anything distinctive about people’s searches for religious terms compared to non-religious terms?

Until these kinds of questions can be answered (ideally with lots of systematically analyzed empirical evidence, not just one-off studies), the use of Google search data to draw conclusions about religion remains on shaky ground.

In dream research we have many decades of studies that have helped us hone in on “emotional concerns” as a primary point of continuity between dreaming and waking. We also have statistical baselines of typical dream content to help us identify meaningful variations in the frequency of certain aspects of dreaming (see, for example, the Dreambank of G. William Domhoff and Adam Schneider, and the Sleep and Dream Database (SDDb) that I direct). If the use of Google search data included these kinds of analytic aids, the results would be much stronger and more convincing.

  1. “Sometimes Google search data, because of Google’s status as a kind of universal question service, is perfectly suited to give us fresh insights into our offline lives.”

The idea of Google as a “universal question service” has great appeal, not the least because so much of the information is easily accessible for public study. This is one of the great boons of the era of big data, and new studies of this treasure trove of information are bound to increase in future years.

A potential problem, however, is a tendency to blur the distinction between a) what Google offers its users and b) who those users are. The fact that Google enables people to ask all kinds of questions does not mean that all kinds of people are asking those questions. Google users are not necessarily representative of the US population as a whole, and we do not know how representative the Google users are who are searching specifically for religious terms. We do know that when people perform a Google search they are connected via technology to the internet, they are interacting with a global corporation, and they are being shown numerous commercial responses to their search. These circumstances should qualify our assumptions about who uses Google and how they engage with the search function.

  1. “There are 4.7 million searches every year for Jesus Christ. The pope gets 2.95 million. There are 49 million for Kim Kardashian.”

This quote comes at the end of the essay, and it perfectly encapsulates the difficulty of explaining the significance of Google search results. According to the findings cited by Stephens-Davidowitz, Kim Kardashian gets ten times the search results of Jesus Christ. What exactly does that mean? That Kim Kardashian is ten times more interesting than Jesus? That she is ten times more popular, or more important, or more influential?

The problem is that Google search data do not meaningfully measure any one thing, other than the tautological fact of having entered a specific search term. The results of analyzing these data seem admirably clear and quantitative—4.7 million vs. 49 million!—but they do not easily or self-evidently map onto the actual beliefs, feelings, and attitudes of the general population.

The good news is that these are tractable problems. Real progress can be made by more detailed studies and more systematic correlations of the data with genuinely meaningful aspects of people’s lives. This fascinating essay by Seth Stephens-Davidowitz helps people who study religion see where these new analytic endeavors can be most fruitfully pursued.

 

Note: first published September 24, 2015 in the Huffington Post.

Google’s Deep Dreaming Project

Deep Dream 2Google recently released a computer program that may help understand various aspects of visual imagination in dreaming.  Check out these images in their “Inceptionism Gallery” here.  The main discussion of the program is from a June 17 post on the Google Research Blog, here.  Other images can be found at the Twitter hashtag #deepdream.

I talk in more detail about Google’s project and its relevance for dream research in a Psychology Today blog post here.

Dream Incubation: An Interview with Arianna Huffington

UnknownThe Huffington Post recently published an interview I did with Arianna Huffington about dream incubation.  She has a long-standing interest in sleep and dreams, along with spiritual curiosity and an appreciation for scientific research–a perfect audience for what I’ve been working on over the past couple of years.  What I told her about dream incubation comes from chapter 15 of the book Big Dreams: The Science of Dreaming and the Origins of Religion (Oxford U. Press), due out in early 2016.  That’s the next-to-last chapter of the book, which starts with a section on the evolution of sleep, laying a scientific foundation for understanding how dreams have emerged in the human species.  The second section looks at empirical patterns in ordinary dream recall and content, drawing on research from the Sleep and Dream Database (SDDb).  The third section focuses on “big dreams,” i.e. rare but extremely vivid and memorable dreams that make a long-lasting impression on waking awareness.  I discuss scientific research on four prototypes of big dreaming that recur especially frequently, throughout history and in cultures all around the world: aggressive, sexual, gravitational, and mystical.  Finally, in the fourth section, I use this information about big dreams to shed new light on several kinds of religious experience found in many different traditions: demonic seduction, prophetic vision, ritual healing, and contemplative practice.  Dream incubation appears in the chapter on ritual healing, with lots of discussion of the Roman orator Aelius Aristides in the 2nd century CE, who wrote about his dream incubation experiences at a temple of the ancient Greek healing god Asclepius.

Lucid Dreaming and the Future of Sports Training

imagesA recently published study in the Journal of Sports Sciences adds new evidence to the idea that physical skills in waking life can be improved by practicing those skills in lucid dreaming. Although the study was small and needs to be replicated, the implications of its findings are potentially enormous for a new mind/body approach to sports training and peak athletic performance.

The study was conducted by German psychologists Tadas Stumbrys, Daniel Erlacher, and Michael Schredl. This team has an excellent background in sports science, sleep laboratory research, and lucid dreaming experiments. Their strong history of high-quality scholarship lends credibility to their claims.

The premise of their study is that a mental simulation of physical behavior is neurologically the same as a “real” enactment of that behavior, with the difference that the former does not extend to bodily movement, while the latter does. As Stumbrys and his colleagues put it, “covert actions are actual actions, except for the fact that they are not executed.” If this is true, as a great deal of neuroscientific evidence indicates it is, then practicing an action “covertly” should have measurable benefits when the action is later performed “openly.” This is the hypothesis that Stumbrys and his colleagues put to the test.

They recruited 68 participants (32 male, 36 female) who followed an online program that trained them in a sequential finger-tapping task on a computer keyboard. The participants were then separated into four groups with different instructions about how to practice the finger-tapping task: 1) actual physical practice, 2) mental practice while awake, 3) mental practice while lucid dreaming, and 4) no practice (the control group). Compared to the control group, all three other groups, including the lucid dreaming group, displayed significant improvements in a follow-up performance of the task after practicing.

The study was not big enough to say if lucid dreaming practice is better or worse than other forms of practice. But the results clearly showed that practice in lucid dreaming does have real performance benefits that are at least comparable to the benefits gained from other practice modes. Given the power of dreams to simulate reality with amazing intensity and accuracy, the possibilities for further development of this approach seem wide open.

In light of these findings, several questions immediately present themselves. What kinds of physical skills are most benefited by lucid dreaming practice? How deep and long-lasting are the improvements? What are the best methods to teach people to have lucid dreams in the first place?

Future studies will be needed to answer these questions. It is not too early, however, to envision some of the practical applications of lucid dreaming in sports training:

1) Providing a safe arena in which high-performance athletes can practice dangerous moves and risky routines, developing skills at the farthest edges of their abilities;

2) Offering injured athletes an opportunity to continue training and skill-building during their rehabilitation;

3) Enabling underprivileged athletes to engage in effective practice of their sports even if they have limited access to physical facilities;

4) Giving athletes at all levels a powerful psychological means of focusing their minds for optimal game-day performance.