July 1, 2011
Why science is the only way out of the trap
of belief-dependent realism
WAS PRESIDENT BARACK OBAMA BORN IN HAWAII? I find the question so absurd, not to mention possibly racist in its motivation, that when I am confronted with “birthers” who believe otherwise, I find it diffcult to even focus on their arguments about the difference between a birth certificate and a certificate of live birth. The reason is because once I formed an opinion on the subject, it became a belief, subject to a host of cognitive biases to ensure its verisimilitude. Am I being irrational? Possibly. In fact, this is how most belief systems work for most of us most of the time.
We form our beliefs for a variety of subjective, emotional and psychological reasons in the context of environments created by family, friends, colleagues, culture and society at large. After forming our beliefs, we then defend, justify and rationalize them with a host of intellectual reasons, cogent arguments and rational explanations. Beliefs come first; explanations for beliefs follow. In my new book The Believing Brain (Holt, 2011), I call this process, wherein our perceptions about reality are dependent on the beliefs that we hold about it, belief-dependent realism. Reality exists independent of human minds, but our understanding of it depends on the beliefs we hold at any given time. (continue reading…)
June 1, 2011
Why Stephen Hawking is wrong
about extraterrestrial intelligences
WITH THE ALLEN TELESCOPE ARRAY run by the SETI Institute in northern California, the time is coming when we will encounter an extraterrestrial intelligence (ETI). Contact will probably come sooner rather than later because of Moore’s Law (proposed by Intel’s co-founder Gordon E. Moore), which posits a doubling of computing power every one to two years. It turns out that this exponential growth curve applies to most technologies, including the search for ETI (SETI): according to astronomer and SETI founder Frank Drake, our searches today are 100 trillion times more powerful than 50 years ago, with no end to the improvements in sight. If E.T. is out there, we will make contact. What will happen when we do, and how should we respond?
Such questions, once the province of science fiction, are now being seriously considered in the oldest and one of the most prestigious scientific journals in the world—Philosophical Transactions of the Royal Society A—which devoted 17 scholarly articles to “The Detection of Extra-Terrestrial Life and the Consequences for Science and Society” in its February issue. The myth, for example, that society will collapse into fear or break out in pandemonium—or that scientists and politicians will engage in a conspiratorial cover-up—is belied by numerous responses. Two such examples were witnessed in December 2010, when NASA held a very public press conference to announce a possible new life-form based on arsenic, and in 1996, when scientists proclaimed that a Martian rock contained fossil evidence of ancient life on the Red Planet and President Bill Clinton made a statement on the topic. Budget-hungry space agencies such as NASA and private fund-raising organizations such as the SETI Institute will shout to the high heavens about anything extraterrestrial they find, from microbes to Martians. But should we shout back to the aliens? (continue reading…)
May 1, 2011
Does new research prove paranormal precognition or normal postcognition?
PSI, OR THE PARANORMAL, denotes anomalous psychological effects that are currently unexplained by normal causes. Historically such phenomena eventually are either accounted for by normal means, or else they disappear under controlled conditions. But now renowned psychologist Daryl J. Bem claims experimental proof of precognition (conscious cognitive awareness) and premonition (affective apprehension) “of a future event that could not otherwise be anticipated through any known inferential process,” as he wrote recently in “Feeling the Future” in the Journal of Personality and Social Psychology.
Bem sat subjects in front of a computer screen that displayed two curtains, behind one of which would appear a photograph that was neutral, negative or erotic. Through 36 trials the subjects were to preselect which screen they thought the image would appear behind, after which the computer randomly chose the window to project the image onto. When the images were neutral, the subjects did no better than 50–50. But when the images were erotic, the subjects preselected the correct screen 53.1 percent of the time, which Bem reports as statistically significant. (continue reading…)
April 1, 2011
Unidentified Aerial Phenomena (UAP) offer a lesson on the residue problem in science
ONE MORNING SEVERAL YEARS AGO a black triangular-shaped object flew over my home in the San Gabriel Mountains in southern California. It was almost completely silent, made rapid turns and accelerations, and was so nonreflective it looked like a hole in the sky, almost otherworldly. It was, in fact, the B-2 Stealth Bomber, looping around to make another run over the Pasadena Rose Parade on January 1, an annual tradition. But had I not known what it was and seen it first, say, out in the desert at dusk, I might easily have thought it a UFO.
For decades black triangularshaped objects have been labeled UFOs. Now a cohort of military, aviation and political observers would like to change the label to a less pejorative phrasing—Unidentified Aerial Phenomena (UAP)— and their efforts to be taken seriously have resulted in a new book by investigative journalist Leslie Kean entitled UFOs: Generals, Pilots, and Government Officals Go on the Record (Crown, 2010). Kean asks readers to consider that such sightings represent “a solid, physical phenomenon that appears to be under intelligent control and is capable of speeds, maneuverability, and luminosity beyond current known technology,” that the “government routinely ignores UFOs and, when pressed, issues false explanations,” and that the “hypothesis that UFOs are of extraterrestrial or interdimensional origin is a rational one and must be taken into account.” (continue reading…)
March 1, 2011
Why economic experts’ predictions fail
IN DECEMBER 2010 I appeared on John Stossel’s television special on skepticism on Fox Business News, during which I debunked numerous pseudoscientific beliefs. Stossel added his own skepticism of possible financial pseudoscience in the form of active investment fund managers who claim that they can consistently beat the market. In a dramatic visual demonstration, Stossel threw 30 darts into a page of stocks and compared their performance since January 1, 2010, with stock picks of the 10 largest managed funds. Results: Dartboard, a 31 percent increase; managed funds, a 9.5 percent increase.
Admitting that he got lucky because of his limited sample size, Stossel explained that had he thrown enough darts to fully represent the market he would have generated a 12 percent increase— the market average—a full 2.5 percentage points higher than the 10 largest managed funds average increase. As Princeton University economist Burton G. Malkiel elaborated on the show, over the past decade “more than two thirds of actively managed funds were beaten by a simple low-cost indexed fund [for example, a mutual fund invested in a large number of stocks], and the active funds that win in one period aren’t the same ones who win in the next period.” (continue reading…)
