Experiment

All posts tagged Experiment

Via The Bent Spoon

Once upon a time, there was a wannabe ghost hunter.  She watched TV shows featuring paranormal investigators going into haunted locations and capturing real ghost voices on their recorders.  flashlight_darkFinding this incredibly cool, she visited websites where ghost hunters from all over uploaded creepy recordings of spirit voices.  She bought a recorder like the ones she saw on TV and did her own EVP (Electronic Voice Phenomenon) experiments.  She lived in a house where a previous owner died on the dining room floor.  Lights went on and off by themselves, faint disembodied voices and footsteps were heard and unexplained shadows were glimpsed out of the corner of the eye.  So obviously, it had to be haunted.  She wanted to prove to others that the ghosts were actually there, and she also wanted to hear what they had to say.  Why were they there?  Were they “stuck” from unfinished business?  Were they attached to the house or something in it?  So, just like the investigators on TV, she held her inexpensive recorder and asked questions.  On playback, she was excited to hear responses.  It was hard to make out the words, but as some ghost hunting experts will explain, sometimes the spirits just don’t have enough “energy” to speak clearly.  One night, she got a reply which sounded more like a snarl.  It scared her, and after stinking up the house with burning sage, she stopped doing sessions in her own home.

ElmerGhost02_250pxYep, that was me several years ago. Back before I took the time to learn about recorders, recording techniques, what environmental factors can affect recorders, and what physiological and psychological factors affect how a person can misinterpret sounds.  Luckily, I can laugh at myself now.  But what isn’t funny is the fact that there are paranormal investigators going into people’s homes or businesses and, because they are making the same mistakes I once made, presenting frightened clients with false positives and calling them ghost voices.  As I mentioned in my article “The Evocative EVP” (
http://carolynscreepycorner.blogspot.com/2012/06/evocative-evp.html
) while more ghost hunting groups are finally acknowledging that there are natural explanations for orb photos, many of these same people are still clinging to their EVPs with a death grip.  I believe this might be because listening is more subjective; you can easily see how orbs are recreated, but replicating false positive EVPs may be more complicated due to various factors.  There have been reliable scientific studies showing that people hear things that are not there.   One study, discussed in Mary Roach’s book Spook, illustrates this and is relevant to EVP review.   Subjects were asked to transcribe a poorly recorded lecture.  Many were able to hear words and even complete phrases.  However, in reality, the recording was nothing but white noise.  Ambient sounds can easily be misinterpreted as voices especially with priming, and when they are within certain frequencies and rhythms causing the brain to automatically switch to speech mode.  Personally, I’ve participated in many audio reviews where people swore they heard a meaningful response when all I heard was something akin to “Glarmpht”.  So even if something sounds like a voice or a phrase, it doesn’t mean that it is.  And even if it is, you still have are left with the task of proving that it belongs to a ghost.
EVPs 1005
Priming and expectation influence what we hear. If we expect (or really want to) hear a voice or certain response, it is likely we will, because our brains are wired to make random information fit into patterns. Understanding speech is much more involved than just our ears hearing what sounds are being produced by vocal cords. We perceive speech by using other senses and the brain processing the combined sensory information, as well as drawing from our memory. One interesting example of how other senses can influence hearing is the McGurk Effect. Subjects watch a video of a person saying one phoneme while the audio is playing another. Subjects see the person say, “Fa fa fa”, and they hear, “Fa fa fa.” However, the audio is actually playing “Ba Ba Ba.” When the subjects close their eyes, they hear “Ba ba ba”, but interestingly, when some open their eyes again and watch the video, they again hear “Fa fa fa” even though they now know that’s not correct.

Bobby Nelson, co-founder and contributing writer for The Bent Spoon Magazine, has conducted experiments demonstrating how priming and expectation influences what we hear. In one experiment . . .

MORE . . .

via Discovery News

A study published last year in a scientific journal claimed to have found strong evidence for the existence of psychic powers such as ESP. The paper, written by Cornell professor Daryl J. Bem, was published in The Journal of Personality and Social Psychology and quickly made headlines around the world for its implication: that psychic powers had been scientifically proven.

Bem’s experiments suggested that college students could accurately predict random events, like whether a computer will flash a photograph on the left or right side of its screen. However scientists and skeptics soon questioned Bem’s study and methodology. Bem stood by his findings and invited other researchers to repeat his studies.

Replication is of course the hallmark of valid scientific research—if the findings are true and accurate, they should be able to be repeated by others. Otherwise the results may simply be due to normal and expected statistical variations and errors. If other experimenters cannot get the same result using the same techniques, it’s usually a sign that the original study was flawed in one or more ways.

Last year a group of British researchers tried and failed to replicate Bem’s experiments. A team of researchers including Professor Chris French, Stuart Ritchie and Professor Richard Wiseman collaborated to accurately replicate Bem’s final experiment, and found no evidence for precognition. Their results were published in the online journal PLoS ONE.

Now a second group of scientists has also replicated Bem’s experiments, and once again found no evidence for ESP. In an article forthcoming in The Journal of Personality and Social Psychology, researchers Jeff Galak, Robyn LeBoeuf, Leif D. Nelson, and Joseph P. Simmons, the authors explained their procedure: “Across seven experiments (N = 3,289) we replicate the procedure of Experiments 8 and 9 from Bem (2011), which had originally demonstrated retroactive facilitation of recall. We failed to replicate that finding. We further conduct a meta-analysis of all replication attempts of these experiments and find that the average effect size (d = .04) is no different from zero.” In other words there was no evidence at all for ESP. The paper, “Correcting the Past: Failures to Replicate Psi,” is available on the web page of the Social Science Research Network.

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via Examiner.com

Will Hart of the University of Alabama conducted several experiments to determine how the way a person expresses or retells emotionally charged past events effects the storytellers mood. The four experiments involved asking participants to recall positive, negative and neutral events, reports the Association for Psychological Science.

Results of the study concluded that when a past negative event is described as though it were still happening – or in the present tense – participant’s moods remained negative. When describing the event as though it had already occurred – or in the past tense – the participants felt more positive. The same held true of describing positive events that have occurred in the past, with the present tense preserving the positive feeling.

The study by Will Hart, which will appear in a future issue of Psychological Science, concluded that one way to alleviate negative feelings is to phrase any discussion of negative events in the past tense, while using the present tense to describe positive events.

This appears to confirm the practice of New Age followers of the Law of Attraction that encourages participants to phrase dreams and goals in the present tense, as though they have already been achieved.

Keep Reading: Expressing past events in present tense preserves original emotion – Bangor new age | Examiner.com.

by (2009)

There are numerous ways in which thought processes go astray, leading us to false conclusions, even persistent delusions. Skepticism, as an intellectual endeavor, is the study of these mental pitfalls, for a thorough understanding of them is the best way to avoid them.

Science itself is a set of methods for avoiding or minimizing errors in observation, memory, and analysis. Our instincts cannot be trusted, so we need to keep them in check with objective outcome measures, systematic observation, and rigid control of variables. In fact bias has a way of creeping into any observation and exerting powerful if subtle effects, leading to the need to completely blind scientific experiments. Good scientists have learned not to trust even themselves.

One of the most common and insidious bits of cognitive self-deception is the process of anomaly hunting. A true anomaly is something that cannot be explained by our current model of nature – it doesn’t fit into existing theories. Anomalies are therefore very useful to scientific inquiry because they point to new knowledge, the potential to deepen or extend existing theories.

[...]

Pseudoscientists – those pretending to do science (maybe even sincerely believing they are doing science) but who get the process profoundly wrong, use anomalies in a different way. They often engage it what we call anomaly hunting – looking for apparent anomalies. They are not, however, looking for clues to a deeper understanding of reality. They are often hunting for anomalies in service to the overarching pseudoscientific process of reverse engineering scientific conclusions.

What this means is that pseudoscience almost always works backwards – that is its primary malfunction, starting with a desired conclusion and then looking for evidence and twisting logic to support that conclusion.

With regard to anomalies the logic often works like this: … (keep reading) NeuroLogica Blog » Anomaly Hunting.

via The Skeptic’s Dictionary – Skepdic.com

The experimenter effect is a term used to describe any of a number of subtle cues or signals from an experimenter that affect the performance or response of subjects in the experiment. The cues may be unconscious nonverbal cues, such as muscular tension or gestures. They may be vocal cues, such as tone of voice. Research has demonstrated that the expectations and biases of an experimenter can be communicated to experimental subjects in subtle, unintentional ways, and that these cues can significantly affect the outcome of the experiment (Rosenthal 1998).

Robert Rosenthal has found that even slight differences in instructions given to control and experimental groups can affect the outcome of an experiment. Different vocal intonations, subtle gestures, even slight changes in posture, might influence the subjects.

[...]

The experimenter effect may explain why many experiments can be conducted successfully only by one person or one group of persons, while others repeatedly fail in their attempts to replicate the results. Of course, there are other reasons why studies cannot be replicated. The original experimenter may have committed errors in design, controls, or calculations. Or he may have committed fraud.

Keep Reading: experimenter effect – The Skeptic’s Dictionary – Skepdic.com.

“There are many different forms,” says David Eagleman, a neuroscientist known for his ability to garner important insights into the nature of perception and consciousness through idiosyncratic methods. “Essentially, any cross-blending of the senses that you can think of, my colleagues and I have found a case somewhere.”

Seeing Sound, Tasting Color: Synesthesia – YouTube.
See Also: Synesthesia – The Skeptic’s Dictionary