Memories may be passed down through generations in DNA in a process that may be the underlying cause of phobias.
photo { Guy Sargent }
Religiosity delays initiation of sexual behavior, but the association may be bidirectional, and individuals may become less religious after first intercourse.
This study uses longitudinal data from college students to examine whether 2 aspects of religiosity change before and after first intercourse using multiphase growth curve models.
Students’ religiosity did not change in the 6 months preceding first intercourse, but on average they attended services less often and felt religion was less important in the 12 months after first intercourse.
{ APA PsycNet }
related { Attributions to God and Satan About Life-Altering Events }
photo { Lionat Natalia Petri }
We conduct an empirical study to analyze how waiting in queue in the context of a retail store affects customers’ purchasing behavior. […] pooling multiple queues into a single queue may increase the length of the queue observed by customers and thereby lead to lower revenues. We also find that customers’ sensitivity to waiting is heterogeneous and negatively correlated with price sensitivity, which has important implications for pricing in a multiproduct category subject to congestion effects.
photo { Garry Winogrand }
Have you ever felt lost and alone? If so, this experience probably involved your hippocampus, a seahorse-shaped structure in the middle of the brain. About 40 years ago, scientists with electrodes discovered that some neurons in the hippocampus fire each time an animal passes through a particular location in its environment. These neurons, called place cells, are thought to function as a cognitive map that enables navigation and spatial memory.
Place cells are typically studied by recording from the hippocampus of a rodent navigating through a laboratory maze. But in the real world, rats can cover a lot of ground. For example, many rats leave their filthy sewer bunkers every night to enter the cozy bedrooms of innocent sleeping children.
In a recent paper, esteemed neuroscientist Dr. Dylan Rich and colleagues investigated how place cells encode very large spaces. Specifically, they asked: how are new place cells recruited to the network as a rat explores a truly giant maze?
We will review evidence from neuroscience, complex network research and evolution theory and demonstrate that — at least in terms of psychopharmacological intervention — on the basis of our understanding of brain function it seems inconceivable that there ever will be a drug that has the desired effect without undesirable side effects.
photo { Hannes Caspar }
“There’s as much biodiversity in the soils of Central Park as we found in the soil… from the Arctic to Antarctica” […] almost 170,000 different kinds of microbes. […] The team also found 2,000 species of microbes that are apparently unique to Central Park.
Studies of human conversation have documented that 30–40% of everyday speech is used to relay information to others about one’s private experiences or personal relationships, and recent surveys of Internet use indicate that upwards of 80% of posts to social media sites (such as Twitter) consist simply of announcements about one’s own immediate experiences.
Although other primates do not generally attempt to communicate to others what they know—for example, by pointing out interesting things or modeling behaviors for others to imitate—by 9 mo of age, human children begin trying to draw others’ attention to aspects of the environment that they find important, and adults in all societies make consistent attempts to impart their knowledge to others. […]
What drives this propensity for disclosure? Here, we test recent theories that individuals place high subjective value on opportunities to communicate their thoughts and feelings to others and that doing so engages neural and cognitive mechanisms associated with reward. Five studies provided sup- port for this hypothesis. Self-disclosure was strongly associated with increased activation in brain regions that form the mesolimbic dopamine system, including the nucleus accumbens and ventral tegmental area. Moreover, individuals were willing to forgo money to disclose about the self.
{ PNAS | PDF }
Self-disclosure plays a central role in the development and maintenance of relationships. One way that researchers have explored these processes is by studying the links between self-disclosure and liking. […]
Significant disclosure-liking relations were found for each effect: (a) People who engage in intimate disclosures tend to be liked more than people who disclose at lower levels, (b) people disclose more to those whom they initially like, and (c) people like others as a result of having disclosed to them.
A woman has reached the age of 24 without anyone realising she was missing a large part of her brain. […] The discovery was made when the woman was admitted to the Chinese PLA General Hospital of Jinan Military Area Command in Shandong Province complaining of dizziness and nausea. She told doctors she’d had problems walking steadily for most of her life, and her mother reported that she hadn’t walked until she was 7 and that her speech only became intelligible at the age of 6.
Doctors did a CAT scan and immediately identified the source of the problem – her entire cerebellum was missing. The space where it should be was empty of tissue. Instead it was filled with cerebrospinal fluid, which cushions the brain and provides defence against disease.
The cerebellum – sometimes known as the “little brain” – is located underneath the two hemispheres. It looks different from the rest of the brain because it consists of much smaller and more compact folds of tissue. It represents about 10 per cent of the brain’s total volume but contains 50 per cent of its neurons. […]
The cerebellum’s main job is to control voluntary movements and balance, and it is also thought to be involved in our ability to learn specific motor actions and speak.
When individual performance was publicly posted in the workplace, employees working in a group performed better than when working alone; however, when individual performance was not posted, employees working in a group performed worse than when working alone.
photo { Lionat Natalia Petri }
We Westerners have a boring pointing repertoire. Most of the time, we just jut out our arm and index finger. If our hands are occupied — carrying a heavy load, say — then we might resort to a jerk of the head or elbow. But if the pointer finger’s free, we’ll point it.
Not so for the Yupno. Within a few days of their arrival in the valley, Núñez and Cooperrider noticed that the Yupno often point with a sharp, coordinated gesture of the nose and head that precedes them looking toward the point of interest. […]
Pointing, he answered, seems to be a fundamental building block of human communication. Great apes are never seen pointing in the wild. And in human babies, pointing develops even before the first word […]
The Yupno aren’t the only ones who point with their face. Lip pointing — in which protruding lips precede an eye gaze toward the area of interest — has been observed in people from Panama, Laos, and other groups in Australia, Africa, and South America. Head pointing, according to one study, happens frequently among people speaking Arabic, Bulgarian, Korean, and African-American Vernacular English.
The main objective of this study was to describe male and female lumbar spine and hip motion and muscle activation patterns during coitus and compare these motions and muscle activity across five common coital positions. […]
A secondary objective was to determine if simulated coitus could be used in place of real coitus for future coitus biomechanics research.
{ via University of Waterloo | PDF }
On Facebook, people frequently express emotions, which are later seen by their friends via Facebook’s “News Feed” product. Because people’s friends frequently produce much more content than one person can view, the News Feed filters posts, stories, and activities undertaken by friends. News Feed is the primary manner by which people see content that friends share. Which content is shown or omitted in the News Feed is determined via a ranking algorithm that Facebook continually develops and tests in the interest of showing viewers the content they will find most relevant and engaging. One such test is reported in this study: A test of whether posts with emotional content are more engaging. […]
For people who had positive content reduced in their News Feed, a larger percentage of words in people’s status updates were negative and a smaller percentage were positive. When negativity was reduced, the opposite pattern occurred. These results suggest that the emotions expressed by friends, via online social networks, influence our own moods, constituting, to our knowledge, the first experimental evidence for massive-scale emotional contagion via social networks, and providing support for previously contested claims that emotions spread via contagion through a network.
polaroid prints { Barbara Allen photographed by Andy Warhol, 1977 }
Fifty-eight adolescent girls and 60 young adult women viewed a Facebook profile with either a sexualized profile photo or a nonsexualized profile photo and then evaluated the profile owner.
Results indicated that the sexualized profile owner was considered less physically attractive, less socially attractive, and less competent to complete tasks.
photo { Dirk Braeckman }
In a little over a century, we’ve discovered that what we once thought was the fundamental, smallest unit of matter — the atom — is actually made up of even smaller particles: nuclei and electrons. The nuclei themselves are made of protons and neutrons, and those protons and neutrons are made of still smaller particles: quarks and gluons.
Those particles — quarks, gluons, and electrons — are just some of the particles that cannot be broken up into smaller constituents to the best of our knowledge. All told, when we count up the fundamental particles that we know of, the ones that cannot be broken apart into anything smaller or lighter, we count a number of different types:
— six quarks (and their antiquark counterparts), each coming in three different color possibilities and two different spins,
— three charged leptons, the electron, muon and tau (and their anti-lepton counterparts), each allowed two different spin states,
— three neutral leptons, the neutrinos, along with the three anti-neutrinos, where the neutrinos all have a left-handed spin and the antis have a right-handed spin,
— the gluons, which all have two different spin states and which come in eight color varieties,
— the photon, which has two different allowable spins,
— the W-and-Z bosons, which come in three types (the W+, W-, and Z) and have three allowable spin states apiece (-1, 0, and +1), and
— the Higgs boson, which exists in only one state.
That’s the Standard Model of elementary particles. […] However, we know there must be more to the Universe, as this doesn’t account for dark matter, for one. Furthermore, there are theoretical limitations and inconsistencies to the physics we presently know and so we suspect there’s more physics beyond the Standard Model to explain it.
Although many studies have reported that women’s preferences for masculine physical characteristics in men change systematically during the menstrual cycle, the hormonal mechanisms underpinning these changes are currently poorly understood. Previous studies investigating the relationships between measured hormone levels and women’s masculinity preferences tested only judgments of men’s facial attractiveness. Results of these studies suggested that preferences for masculine characteristics in men’s faces were related to either women’s estradiol or testosterone levels.
To investigate the hormonal correlates of within-woman variation in masculinity preferences further, here we measured 62 women’s salivary estradiol, progesterone, and testosterone levels and their preferences for masculine characteristics in men’s voices in five weekly test sessions. Multilevel modeling of these data showed that changes in salivary estradiol were the best predictor of changes in women’s preferences for vocal masculinity.
These results complement other recent research implicating estradiol in women’s mate preferences, attention to courtship signals, sexual motivation, and sexual strategies, and are the first to link women’s voice preferences directly to measured hormone levels.
related { Evidence to Suggest that Women’s Sexual Behavior is Influenced by Hip Width Rather than Waist-to-Hip Ratio }
The systematic biases seen in people’s probability judgments are typically taken as evidence that people do not use the rules of probability theory when reasoning about probability but instead use heuristics, which sometimes yield reasonable judgments and sometimes yield systematic biases. This view has had a major impact in economics, law, medicine, and other fields; indeed, the idea that people cannot reason with probabilities has become a truism. We present a simple alternative to this view, where people reason about probability according to probability theory but are subject to random variation or noise in the reasoning process. […] Results suggest that people’s probability judgments embody the rules of probability theory and that biases in those judgments are due to the effects of random noise.
Why do fingers get wrinkly in the water? […]
A hypothesis has been proposed which suggests that the wrinkling might be an evolutionary adaptation to make the handling of objects underwater easier. Wrinkling creates a kind of drainage path for water and so enhances the grip on an object (this is called a ‘rain tread’ hypothesis). In order to test if this hypothesis is true Kareklas et al. have recruited volunteers and tested their ability to transfer wet objects when the fingers are wrinkled and not. […]
20 participants had to transfer glass marbles from one container to another in two different conditions (1) take the marble from a container with water pass it through a small hole and put into an empty container and (2) take the marble from a container without water pass it through a small hole and put into an empty container. […]
When the marble ball was dry there was no difference between the transfer time with wrinkly and smooth fingers. However, when the marble was wet then on average it took 12% less time to transfer the object with wrinkly fingers. Therefore, the study concluded that the wrinkling of fingers improves the handling of wet objects (which supports the rain tread hypothesis). Why are our fingers not always wrinkled then? In paper’s discussion Kareklas et al. suggest that there potentially are some fitness trade-offs to the wrinkly fingers. Maybe wrinkled fingers are less sensitive to pain, pressure, heat etc. and are therefore damaged easier, which would explain why it is not good to always have those wrinkles.
{ The Question Gene | Continue reading }
The work done in this room lies at the heart of a department that handles some of the UK’s most cutting-edge research on forensics and anatomy. […]
The hand is Meadows’ area of focus. Variations in scars, skin pigmentation, the smallest nooks and crannies of the fingernail and, most importantly, superficial vein patterns: all of these can build a body of evidence and allow the police to identify an offender in an incriminating photograph. “The back of the hand is part of the anatomy that an offender is quite happy to have in an image, whereas they wouldn’t necessarily want their face captured,” Meadows says. In 2009, Cahid’s work was instrumental in the Neil Strachan case, part of Scotland’s biggest paedophile ring. His unusually distorted lunula (the white half moon at the bottom of a nail) helped identify and convict him.
Meadows and her colleagues have built up the UK’s only database of the hand’s vein patterns, with around 800 samples. Of the 40 or so cases they have worked on, their data have resulted in over 80 per cent of suspects changing their plea.
Common parlance such as “ray of hope” depicts an association between hope and the perception of brightness. Building on research in embodied cognition and conceptual metaphor, we examined whether incidental emotion of hopelessness can affect brightness perception, which may influence people’s preference for lighting. Across four studies, we found that people who feel hopeless judge the environment to be darker (Study 1). As a consequence, hopeless people expressed a greater desire for ambient brightness and higher wattage light bulbs (Studies 2 and 3). Study 4 showed the reversal of the effect — being in a dimmer (vs. brighter) room induces greater hopelessness toward the perceived job search prospects. Taken together, these results suggest that hopeless feeling seems to bias people’s perceptual judgment of ambient brightness, which may potentially impact their electricity consumption.
{ SAGE }
Using data from an online hotel reservation site, the authors jointly examine consumers’ quality choice decision at the time of purchase and subsequent satisfaction with the hotel stay.
They identify three circumstantial variables at the time of purchase that are likely to influence both the choice decisions and the postpurchase satisfaction: the time gap between purchase and consumption, distance between purchase and consumption, and time of purchase (business/nonbusiness hours).
The authors incorporate these three circumstantial variables into a formal two-stage economic model and find that consumers who travel farther and make reservations during business hours are more likely to select higher-quality hotels but are less satisfied.
photo { Philip Lorca-diCorcia, Roy, ‘in his 20s’, Los Angeles, California, $50 (Hustlers series), 1990-1992 }
