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Now You See It! – The Science of Misdirection in Magic

November 24, 2024

Magicians have been performing seemingly impossible feats to awe-struck audiences for millennia. With a simple flick of a hand or snap of a finger, magicians can make objects appear and disappear in the blink of an eye, make someone levitate off the ground, or even saw people in half! To perform these feats, magicians often use their knowledge of how attention works and a bit of misdirection to focus their audience’s attention where they want them to focus (Alexander et al., 2022). How does attention work, and how do magicians use misdirection to pull off these incredible feats?

What is Attention and How Does it Work?

Attention is selectively choosing to focus on specific aspects of our environment, while ignoring other stimuli (Kuhn et al., 2022). Attention is like a spotlight – we can only focus on one aspect of our environment at a time, and everything else outside of that spotlight goes unnoticed. There are two main types of attention: goal-directed attention and stimulus-driven attention. Goal-directed attention is when we choose to focus on something to accomplish some motivated goal, while stimulus-driven attention is when a stimulus in our surroundings grabs our attention (Yantis, 2002). Imagine this scenario: we’re watching a show on the TV, when we suddenly hear a loud thump from the other room. Our attention was initially focused on the TV show but instinctively shifts as we focus on the source of the loud thump. The loud thump automatically draws our attention as it may be something we need to protect ourselves from. After determining that the sound was from a family member accidentally dropping a box on the floor, we can return our attention to watching the TV show once more. We are using goal-directed attention when we are focused on watching the TV show. When we hear the unexpected loud thump, we switch to stimulus-driven attention as we try to determine the source of that sound. Magicians often use stimulus-driven attention to direct their audience’s attention to what the magician wants them to see.

How Do Magicians Use Misdirection?

Misdirection in magic is when a magician guides our attention towards the magical effects and away from what is really happening. Magicians often use their gaze, multiple hand movements, and other cues to carefully control the audience’s attention to where the magicians want them to focus (Alexander et al., 2022; Icard et al., 2024). For example, a magician could do elaborate movements with their right hand, drawing the audience’s attention to their right hand, while their left hand subtlety goes into their pocket. Multiple, quick hand movements within a short period of time can overwhelm our attentional spotlight, allowing magicians to make coins magically appear and disappear within the blink of an eye without seeming to touch the coins (Icard et al., 2024). Misdirection is a skill that must be practiced well to perform in front of an audience. Famous magicians such as Apollo Robins or Penn and Teller have mastered the technique of misdirection, allowing them to perform complex tricks such as changing tin foil balls into baseballs or taking a watch right off someone’s wrist without them noticing.

Attention is a powerful tool that can shape our perceptions of the world, so be sure to pay attention!

 

Citations:

Alexander, R. G., Macknik, S. L., & Martinez-Conde, S. (2022). What the Neuroscience and Psychology of Magic Reveal about Misinformation. Publications, 10(4), 33. https://doi.org/10.3390/publications10040033

Icard, B., & Fervari, R. (2024). Beyond the Spell: A Dynamic Logic Analysis of Misdirection. ArXiv.org. https://arxiv.org/abs/2401.14516

Kuhn, G., Kingori, P., & Peeters Grietens, K. (2022). Misdirection – Magic, Psychology and its Application. Science & Technology Studies, 35(2), 13–29. https://doi.org/10.23987/sts.112182

Yantis, S. (2002). Stimulus-Driven and Goal-Directed Attentional Control. In: Cantoni, V., Marinaro, M., Petrosino, A. (eds) Visual Attention Mechanisms. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-0111-4_12

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  Timothy Durham was convicted of rape when a test showed his DNA genotype matched the DNA recovered from the crime scene. Eye witnesses testified that Durham was in a different state at the time of the incident, but he wasn’t exonerated from his 3000 year sentence until follow up DNA analysis showed that the preliminary forensic analysis used in the trial was misinterpreted (Thomas et al.). DNA testing serves an invaluable part in our criminal justice system, but it comes with complications and bias that can lead to wrongful convictions and misinformed juries.  

Background:

Forensic genetics aims to identify the origin of a biological sample. It can be traced back to Karl Landsteiner who discovered human ABO blood groups. With blood groups, suspects could be eliminated based on their blood type. For example, if a suspect had type A blood and there was type B blood left at the scene by the perpetrator, the investigators could rule out the suspect. Unfortunately, the reverse didn’t work. If the suspect and perpetrator both had the same blood type, it can’t be concluded that the suspect was guilty. Blood identifiers evolved into 8 distinct categories which improved the ability to eliminate suspects, but could only conclude that (if the system matched) it might be the perpetrator or this person might be related to the perpetrator (Jobling and Gill). The field evolved in the 1980s with the discovery of Minisatellites, lines of repetitive DNA that don’t encode proteins. Minisatellite patterns in DNA create what we know today as the DNA fingerprint, and it has a much higher accuracy rate than previous methods (Augustyn et al.). Around the same time, a breakthrough for victims of sexual assault was discovered. In the case of assault, bodily fluids of both the victim and the assaulter can get mixed. A process called differential lysis was created which could selectively increase the concentration of sperm in a fluid sample thereby allowing for accurate DNA testing (Jobling and Gill). Forensics evolved to use single-locus probe testing after several years because of its ease of interpretation. It looked at specific minisatellites that had high variability between subjects. This was the first DNA-based method to be used in a criminal investigation. Two murder homicides from several years apart were connected using DNA evidence. The evidence was then used to exonerate an innocent man, and the guilty party was found when he tried to evade mandatory DNA testing for all men in the small town. His guilt was then reinforced when the DNA profiles matched, and he gave a confession (Jobling and Gill). Finding DNA at a crime scene doesn’t guarantee that you’ll find a murderer. There are issues with non-pure samples and limited samples that make DNA work difficult, and accreditation of facilities and new techniques and take time (Jobling and Gill).  

Subjectivity of DNA Interpretation:

In a 2009 publication, the National Academy of Science discusses the possibility for subjective influence in lab based forensics. The interpretation bias happens in complex cases where, for example, there could be a mixture of DNA. A study published in 2011 looked specifically at this issue. A gang rape happened in Georgia, and the mixture in DNA from the case was used to prosecute one suspect after another suspect took a plea bargain to testify against him. With DNA mixtures, there are three possible conclusions: suspect excluded, suspect cannot be excluded, and inconclusive. If the suspect is excluded, it means that there’s little to no possibility that his DNA is part of the sample. If the suspect cannot be excluded, it means that there’s a possibility that his DNA is part of the sample. In the trial, the DNA examiners who knew the context of the case concluded that the suspect being prosecuted could not be excluded. The 2011 study gave the DNA evidence from this case and the DNA profiles of the suspects to 17 forensic examiners. These examiners had no context of the case, and they all worked independently. Of the 17, only 1 came to the same conclusion (suspect cannot be excluded) as the examiners who knew the context of the case. Twelve of the 17 concluded that the suspect who was prosecuted and convicted had no relation to the DNA found in the sample. Not only does this show that subjectivity occurs due to the context of the case, but the 17 examiners came up with different findings based on their past experiences meaning that not all DNA analysis is objective. Some organizations like the Scientific Working Group on DNA Analysis Methods say that quantitative statistical evidence should be presented with every categorical conclusion, but the US doesn’t require this (Dror and Hampikian).

False Positives:

There are two categories that cause wrongful identification in a DNA report: coincidental matches and false positives. Coincidental matches are DNA matches between two unrelated people. The probability of these matches is about 1 to 500,000 for white individuals and about 1 to 350,000 for black individuals. This small probability of coincidental matches makes people feel confident in DNA evidence. False positives, on the other hand, are matches between DNA and test DNA that result from issues in the forensics lab. There have been multiple cases of forensics labs accidentally switching victim and suspected rapist DNA which lead to convictions that were later overturned when the lab realized the error. There are also cases of misreading or misunderstanding a sample. In a case from 1993, a man was convicted of rape because someone interpreted a mixed sample of victim and perpetrator DNA as an individual sample. The conviction was again overturned. To prevent false convictions, retesting DNA is allowed, but it’s not an efficient solution. Many people are pushing for statistical information on the probability of false positives, so that the jurors can make accurate judgements based on DNA evidence (Thomas et al.).  

Conclusion:

DNA analysis is a useful tool for the criminal justice system, but subjectivity can be an issue in forensic testing. To combat wrongful convictions, there are organizations like The Innocence Project who use DNA testing to free the innocent, but reformed forensic testing standards should be put in place to prevent subjectivity and to ensure juries are correctly informed during trials. https://www.innocenceproject.org/    

Citation:

Augustyn , Adam, et al. “DNA Finerprinting.” Encyclopedia Britannica , 26 Apr. 2018, www.britannica.com/science/DNA-fingerprinting#ref153186. Dror, Itiel E., and Greg Hampikian. “Subjectivity and Bias in Forensic DNA Mixture Interpretation.” Science & Justice, vol. 51, no. 4, 2011, pp. 204–208., doi:10.1016/j.scijus.2011.08.004. Jobling, Mark A., and Peter Gill. “Encoded Evidence: DNA in Forensic Analysis.” Nature Reviews: Genetics, vol. 5, no. 10, Oct. 2004, pp. 739–751., doi:10.1038/nrg1455. Thompson, William C, et al. “How the Probability of a False Positive Affects the Value of DNA Evidence.” Journal of Forensic Sciences, vol. 48, no. 1, Jan. 2003, pp. 1–8., doi:10.1520/jfs2001171.