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Target acquisition and interception in dragonflies

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Apologetics and the progress of science
Apologetics and the progress of science

Here is a fascinating post about some of the capabilities of dragonflies from Evolution News.

Selective attention

First, dragonflies have “selective attention” – the ability to focus on a single prey and ignore other distractions:

Dragonflies are among the best flyers in the insect world. Their twin pairs of paper-thin wings allow them to hover and move in all directions, even in mating. When the time comes to dart after prey at high speed, they rarely miss.

What’s their secret? One is “selective attention” — a trait previously known only in primates, according to new research from the University of Adelaide, Australia. Selective attention is the ability to focus on one object and exclude others. Just as a tennis player must focus on the ball and ignore the cheers of the crowd, a dragonfly must pick out one target from a swarm of insects and avoid being distracted by all the others.

Here’s a snip from the research paper:

Our data make a compelling case that CSTMD1 reflects competitive selection of one target. We emphasize “competitive,” because the attended target is not always the same between trials or even within a trial, as seen in strikingly perfect switches from one to the other…. Competition is further suggested by rare examples where the activity observed under Pair stimulation initially lags both T1and T2 responses… suggesting initial conflict in the underlying neural network before resolution of competition by a “winning” target.

We previously showed that CSTMD1 still responds robustly to a target even when it is embedded within a high-contrast natural scene containing numerous potential distracters. Taken together with recent evidence that the behavioral state of insects strongly modulates responses of neurons involved in visuomotor control, our new data thus suggest a hitherto unexpected sophistication in higher-order control of insect visual processing, akin to selective attention in primates.Perhaps the most remarkable feature of our data is that once the response “locks” onto a target (or following a switch), the second target exerts no influence on the neuron’s response: the distracter is ignored completely.

In order to succeed at the task of catching its prey, the dragonfly has to tune out all other distractions.

Target selection

In addition, dragonflies have the ability to intercept a target in mid-air – similar missile defense systems on AEGIS cruisers and destroyers.

The Evolution News article explains:

Another paper on dragonflies shows that these marvels of the insect world are equipped with navigational equipment that can do vector calculus. In the Proceedings of the National Academy of Sciences, Gonzalez-Bellido and a team at the Howard Hughes Medical Institute discerned “Eight pairs of descending visual neurons in the dragonfly [that] give wing motor centers accurate population vector of prey direction.”

Intercepting a moving object requires prediction of its future location. This complex task has been solved by dragonflies, who intercept their prey in midair with a 95% success rate. In this study, we show that a group of 16 neurons, called target-selective descending neurons (TSDNs), code a population vector that reflects the direction of the target with high accuracy and reliability across 360°. The TSDN spatial (receptive field) and temporal (latency) properties matched the area of the retina where the prey is focused and the reaction time, respectively, during predatory flights. The directional tuning curves and morphological traits (3D tracings) for each TSDN type were consistent among animals, but spike rates were not. Our results emphasize that a successful neural circuit for target tracking and interception can be achieved with few neurons and that in dragonflies this information is relayed from the brain to the wing motor centers in population vector form.

What did I make of this? Well, evidence like this always causes me to think aboutthe reality of God, and the disturbing thought that we do not live in an accidental universe where I can do whatever I want and be accountable to no one. It’s easier to believe that – it requires less work and it frees us to be our own boss and make our happiness the first priority. As individuals, it’s very tempting for us to think that we are number one, and to resent our obligations to anyone else. The problem is that the scientific data doesn’t support that worldview. The facts are what they are and it is up to us, now, to try to find out who the designer is and what he wants from us.

News

The link between single mother welfare, fatherlessness, poverty, crime and school shootings

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Does government provide incentives for people to get married?
Government pays people welfare not to get married before having kids

We now know that the shooter in the Oregon shooting did not have a close relationship with his father – he was fatherless.

According to reports, Harper-Mercer was born in the UK to a British father before the family moved to the US in the mid-90s. His parents divorced in 2006 and he had lived most recently with his mother in Oregon, OregonLive reported.

My friends Patrick C. and William B. both messaged me about this article by sociologist W. Bradford Wilcox, who points out the link between fatherlessness and crime.

The article appears in National Review.

Wilcox writes:

Another shooting, another son of divorce. From Adam Lanza, who killed 26 children and adults a year ago at Sandy Hook School in Newtown, Conn., to Karl Pierson, who shot a teenage girl and killed himself this past Friday at Arapahoe High in Centennial, Colo., one common and largely unremarked thread tying together most of the school shooters that have struck the nation in the last year is that they came from homes marked by divorce or an absent father. From shootings at MIT (i.e., theTsarnaev brothers) to the University of Central Florida to the Ronald E. McNair Discovery Learning Academy in Decatur, Ga., nearly every shooting over the last year in Wikipedia’s “list of U.S. school attacks” involved a young man whose parents divorced or never married in the first place.

[…]The social scientific evidence about the connection between violence and broken homes could not be clearer. My own research suggests that boys living in single mother homes are almost twice as likely to end up delinquent compared to boys who enjoy good relationships with their father. Harvard sociologist Robert Sampson has written that “Family structure is one of the strongest, if not the strongest, predictor of variations in urban violence across cities in the United States.” His views are echoed by the eminent criminologists Michael Gottfredson and Travis Hirschi, who have written that “such family measures as the percentage of the population divorced, the percentage of households headed by women, and the percentage of unattached individuals in the community are among the most powerful predictors of crime rates.”

Why is fatherlessness such a big deal for our boys (almost all of these incidents involve boys)? Putting the argument positively, sociologist David Popenoe notes that “fathers are important to their sons as role models. They are important for maintaining authority and discipline. And they are important in helping their sons to develop both self-control and feelings of empathy toward others, character traits that are found to be lacking in violent youth.” Boys, then, who did not grow up with an engaged, attentive, and firm father are more vulnerable to getting swept up in the Sturm und Drang of adolescence and young adulthood, and in the worst possible way.

So where do fatherless children come from? It turns out that government programs incentivize women to make them.

Dr. Michael Tanner of the libertarian Cato Institute explains how welfare causes fatherlessness in his testimony to Congress:

Welfare contributes to crime in several ways. First, children from single-parent families are more likely to become involved in criminal activity. According to one study, children raised in single-parent families are one-third more likely to exhibit anti-social behavior.(3) Moreover, O’Neill found that, holding other variables constant, black children from single- parent households are twice as likely to commit crimes as black children from a family where the father is present. Nearly 70 percent of juveniles in state reform institutions come from fatherless homes, as do 43 percent of prison inmates.(4) Research indicates a direct correlation between crime rates and the number of single-parent families in a neighborhood.(5)

As Barbara Dafoe Whitehead noted in her seminal article for The Atlantic Monthly:

The relationship [between single-parent families and crime] is so strong that controlling for family configuration erases the relationship between race and crime and between low income and crime. This conclusion shows up time and again in the literature. The nation’s mayors, as well as police officers, social workers, probation officers, and court officials, consistently point to family break up as the most important source of rising rates of crime.(6)

At the same time, the evidence of a link between the availability of welfare and out-of-wedlock births is overwhelming. There have been 13 major studies of the relationship between the availability of welfare benefits and out-of-wedlock birth. Of these, 11 found a statistically significant correlation. Among the best of these studies is the work done by June O’Neill for the U.S. Department of Health and Human Services. Holding constant a wide range of variables, including income, education, and urban vs. suburban setting, the study found that a 50 percent increase in the value of AFDC and foodstamp payments led to a 43 percent increase in the number of out-of-wedlock births.(7) Likewise, research by Shelley Lundberg and Robert Plotnick of the University of Washington showed that an increase in welfare benefits of $200 per month per family increased the rate of out-of-wedlock births among teenagers by 150 percent.(8)

The same results can be seen from welfare systems in other countries. For example, a recent study of the impact of Canada’s social-welfare system on family structure concluded that “providing additional benefits to single parents encourages births of children to unwed women.”(9)

The secular left in this country believes that fathers need to be separated away from their children, and that’s why they support welfare programs that redirect money from husbands in intact families to single mothers. They believe that fathers are harmful because they set boundaries on children, and judge them and punish them when they act immorally. To the secular left, boundaries, judgments and punishments on children are bad, and must be stopped. So how can the secular left discourage men from marrying and teaching their own children morality? Well, they can tax married men, and they can give the money to single mothers.

Not only is crime caused by fatherlessness, but poverty is. as well.

Here is Dr. Robert Rector of the Heritage Foundation to explain:

Census data and the Fragile Families survey show that marriage can be extremely effective in reducing child poverty. But the positive effects of married fathers are not limited to income alone. Children raised by married parents have substantially better life outcomes compared to similar children raised in single-parent homes.

When compared to children in intact married homes, children raised by single parents are more likely to have emotional and behavioral problems; be physically abused; smoke, drink, and use drugs; be aggressive; engage in violent, delinquent, and criminal behavior; have poor school performance; be expelled from school; and drop out of high school.[19] Many of these negative outcomes are associated with the higher poverty rates of single mothers. In many cases, however, the improvements in child well-being that are associated with marriage persist even after adjusting for differences in family income. This indicates that the father brings more to his home than just a paycheck.

The effect of married fathers on child outcomes can be quite pronounced. For example, examination of families with the same race and same parental education shows that, when compared to intact married families, children from single-parent homes are:

  • More than twice as likely to be arrested for a juvenile crime;[20]
  • Twice as likely to be treated for emotional and behavioral problems;[21]
  • Roughly twice as likely to be suspended or expelled from school;[22] and
  • A third more likely to drop out before completing high school.[23]

The effects of being raised in a single-parent home continue into adulthood. Comparing families of the same race and similar incomes, children from broken and single-parent homes are three times more likely to end up in jail by the time they reach age 30 than are children raised in intact married families. [24] Compared to girls raised in similar married families, girls from single-parent homes are more than twice as likely to have a child without being married, thereby repeating the negative cycle for another generation.[25]

Finally, the decline of marriage generates poverty in future generations. Children living in single-parent homes are 50 percent more likely to experience poverty as adults when compared to children from intact married homes. This intergenerational poverty effect persists even after adjusting for the original differences in family income and poverty during childhood.[26]

People on the left claim that poverty causes crime, but they don’t look for the root cause of poverty. The root cause of poverty is the decline of marriage, which produces fatherless children.

Polemics

Alexander Vilenkin: “All the evidence we have says that the universe had a beginning”

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I’ve decided to explain why physicists believe that there was a creation event in this post. That is to say, I’ve decided to let famous cosmologist Alexander Vilenkin do it.

From Uncommon Descent.

Excerpt:

Did the cosmos have a beginning? The Big Bang theory seems to suggest it did, but in recent decades, cosmologists have concocted elaborate theories – for example, an eternally inflating universe or a cyclic universe – which claim to avoid the need for a beginning of the cosmos. Now it appears that the universe really had a beginning after all, even if it wasn’t necessarily the Big Bang.

At a meeting of scientists – titled “State of the Universe” – convened last week at Cambridge University to honor Stephen Hawking’s 70th birthday, cosmologist Alexander Vilenkin of Tufts University in Boston presented evidence that the universe is not eternal after all, leaving scientists at a loss to explain how the cosmos got started without a supernatural creator. The meeting was reported in New Scientist magazine (Why physicists can’t avoid a creation event, 11 January 2012).

[…]In his presentation, Professor Vilenkin discussed three theories which claim to avoid the need for a beginning of the cosmos.

The three theories are chaotic inflationary model, the oscillating model and quantum gravity model. Regular readers will know that those have all been addressed in William Lane Craig’s peer-reviewed paper that evaluates alternatives to the standard Big Bang cosmology.

But let’s see what Vilenkin said.

More:

One popular theory is eternal inflation. Most readers will be familiar with the theory of inflation, which says that the universe increased in volume by a factor of at least 10^78 in its very early stages (from 10^−36 seconds after the Big Bang to sometime between 10^−33 and 10^−32 seconds), before settling into the slower rate of expansion that we see today. The theory of eternal inflation goes further, and holds that the universe is constantly giving birth to smaller “bubble” universes within an ever-expanding multiverse. Each bubble universe undergoes its own initial period of inflation. In some versions of the theory, the bubbles go both backwards and forwards in time, allowing the possibility of an infinite past. Trouble is, the value of one particular cosmic parameter rules out that possibility:

But in 2003, a team including Vilenkin and Guth considered what eternal inflation would mean for the Hubble constant, which describes mathematically the expansion of the universe. They found that the equations didn’t work (Physical Review Letters, DOI: 10.1103/physrevlett.90.151301). “You can’t construct a space-time with this property,” says Vilenkin. It turns out that the constant has a lower limit that prevents inflation in both time directions. “It can’t possibly be eternal in the past,” says Vilenkin. “There must be some kind of boundary.”

A second option explored by Vilenkin was that of a cyclic universe, where the universe goes through an infinite series of big bangs and crunches, with no specific beginning. It was even claimed that a cyclic universe could explain the low observed value of the cosmological constant. But as Vilenkin found, there’s a problem if you look at the disorder in the universe:

Disorder increases with time. So following each cycle, the universe must get more and more disordered. But if there has already been an infinite number of cycles, the universe we inhabit now should be in a state of maximum disorder. Such a universe would be uniformly lukewarm and featureless, and definitely lacking such complicated beings as stars, planets and physicists – nothing like the one we see around us.

One way around that is to propose that the universe just gets bigger with every cycle. Then the amount of disorder per volume doesn’t increase, so needn’t reach the maximum. But Vilenkin found that this scenario falls prey to the same mathematical argument as eternal inflation: if your universe keeps getting bigger, it must have started somewhere.

However, Vilenkin’s options were not exhausted yet. There was another possibility: that the universe had sprung from an eternal cosmic egg:

Vilenkin’s final strike is an attack on a third, lesser-known proposal that the cosmos existed eternally in a static state called the cosmic egg. This finally “cracked” to create the big bang, leading to the expanding universe we see today. Late last year Vilenkin and graduate student Audrey Mithani showed that the egg could not have existed forever after all, as quantum instabilities would force it to collapse after a finite amount of time (arxiv.org/abs/1110.4096). If it cracked instead, leading to the big bang, then this must have happened before it collapsed – and therefore also after a finite amount of time.

“This is also not a good candidate for a beginningless universe,” Vilenkin concludes.

So at the end of the day, what is Vilenkin’s verdict?

“All the evidence we have says that the universe had a beginning.”

This is consistent with the Borde-Guth-Vilenkin Theorem, which I blogged about before, and which William Lane Craig leveraged to his advantage in his debate with Peter Millican.

The Borde-Guth-Vilenkin (BGV) proof shows that every universe that expands must have a space-time boundary in the past. That means that no expanding universe, no matter what the model, can be eternal into the past. No one denies the expansion of space in our universe, and so we are left with a cosmic beginning. Even speculative alternative cosmologies do not escape the need for a beginning.

Conclusion

If the universe came into being out of nothing, which seems to be the case from science, then the universe has a cause. Things do not pop into being, uncaused, out of nothing. The cause of the universe must be transcendent and supernatural. It must be uncaused, because there cannot be an infinite regress of causes. It must be eternal, because it created time. It must be non-physical, because it created space. There are only two possibilities for such a cause. It could be an abstract object or an agent. Abstract objects cannot cause effects. Therefore, the cause is an agent.

Now, let’s have a discussion about this science in our churches, and see if we can’t train Christians to engage with non-Christians about the evidence so that everyone accepts what science tells us about the origin of the universe.