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Gabe O'Brien

It’s in the Cards: A Dive into Tarot Card Psychology, Interpretation and Therapeutic Applications

April 21, 2024 by Gabe O'Brien

With a long history dating back nearly 700 years, Tarot cards have maintained a presence in society as a tool that is considered to predict the future and understand one’s inner issues, desires, and motivations. There are many conflicting theories regarding the origin of Tarot cards, with the predominant notion pointing to 14th century northern Italy (Tarot Heritage). Researchers claim that the major arcana of Tarot is based on the Egyptian hieroglyphic book of Thoth (the Egyptian god of wisdom), which is also known as the book of Tarot (Willis 1988). But why do people still use Tarot cards, and what do we get out of using them? The phenomenon surrounding the use and interpretation of Tarot cards can be broken down into two juxtaposing explanations: paranormal and nonparanormal. The paranormal explanation claims that Tarot cards reveal hidden motives, portray opportunities, and offer a reflection of a person’s inner processes, allowing the cards to provide clarity regarding a person’s questions or conflicts. Meanwhile, the nonparanormal explanation claims that the entire phenomenon of Tarot cards can be explained by examining two simple psychological effects: The Barnum effect and “cold reading” (Ivtzan 2007). Additionally, several modern therapeutic approaches have employed the use of Tarot cards as a tool for self-reflection, with Tarot card readings offering clients a sense of order and control in their own lives (Hofer 2009). There are several different reasons for why people use Tarot cards, and the associated applications of the cards can help to improve a person’s mental health when the cards are utilized in a therapeutic context (Hofer 2009).

Many standard Tarot decks follow the same 78-card structure, which is divided into the minor arcana (56 cards), and the major arcana (22 cards). The cards in the major arcana represent the main themes of human life, such as love, death, spirituality, acceptance, etc. The cards in the minor arcana represent subtle mysteries of life, and are considered to be lesser compared to the major arcana (Ivtzan 2007). Additionally, there are several different techniques for choosing the cards in a reading, with the most popular option being for the reader to ask the client to shuffle the cards while focusing on a question, spread the deck, and choose the cards that they feel the most drawn to (Ivtzan 2007). The use of Tarot cards has continued to flourish, even in western societies, and the popularity of Tarot cards is not an indication of reliability or validity, but rather a look into how using the cards can influence our thought processes and mental state. 

Figure 1: The major arcana of Tarot (Medium).

The paranormal explanation surrounding the phenomenon of Tarot cards is the approach that is acclaimed by occultists who believe that the cards reveal information about the quality of a moment for an individual (Ivtzan 2007). They do not believe that the cards predict the future as if it is fixed, but rather reveal information and potential circumstances about changeable events. By creating more awareness about the meaning of a specific moment for a client, this can help to provide the client with important insights, as well as a drive to take control of their own life and make changes that will be beneficial to them in the long run. Comparatively, the nonparanormal explanation examines the use of Tarot cards through the lens of psychological effects, with the Barnum effect being the most emphasized. The Barnum effect is the tendency to believe that vague predictions or general personality descriptions, such as those offered by Tarot or astrology, have specific applications to one’s unique circumstances (American Psychological Association). A Tarot reader may make general, trivial statements that could apply to anyone, and a client, eager to seek guiding information about their life, will accept these statements as truth. The major arcana of Tarot deals with themes that concern every individual’s life, so it is not difficult to come up with general statements about these themes that any person could be susceptible to (Ivtzan 2007). The other psychological effect that the nonparanormal explanation examines is “cold reading,” which is a set of deceptive psychological techniques that give a client the impression that a reader has paranormal abilities. The Barnum effect falls under the umbrella of  “cold reading,” and the techniques behind “cold reading” involve the use of sharp observational skills and a good memory when examining a client. Cues such as a client’s clothing, physical characteristics, and manner of speech can reveal a lot of valuable information to a reader, that a reader can then use to inform the statements that they make to a client regarding the topic of their reading (Ivtzan 2007).

Although there are underlying psychological influences behind the use of Tarot cards, Tarot card readings can still have beneficial effects on a person’s mental health when used in a therapeutic context. A 2009 study investigated how regular users of Tarot cards employed the cards as a tool for self-reflection (rather than for divination). The study involved conducting interviews with several co-researchers who used Tarot cards regularly and in a self-reflective manner, and the interviews from the study were transcribed, with the common themes and qualities that existed between the interviews being extracted (Hofer 2009). Overall, the results of the study found that the co-researchers used Tarot cards as a way to gain insight into their current life situations. The cards were found to be used the most often during difficult times where they could offer a source of comfort. This source of comfort involved providing confirmation that everything was okay and that life had a sense of order. 

On top of this, Tarot cards were also used as a tool for positive reinforcement, where cards were drawn both intentionally and randomly to provide insights about what the co-researchers were seeking in their own lives. With a goal in mind, some of the co-researchers drew a card and then kept it with them until what they were working on or towards had been resolved. They claim that Tarot does not reveal new information to them, but that the use of Tarot cards can help to provide a new perspective on an issue that can influence a plan for a possible course of action (Hofer 2009). 

By examining how therapeutic techniques involving Tarot have been successful for co-researchers who have consistently employed these techniques in their own lives, this study outlines how Tarot has the potential to be used as an effective therapeutic tool. Despite the foundational psychological effects behind the mainstream use of Tarot, Tarot cards can still have beneficial impacts on a person’s mental health and inner psychological processes. Further research surrounding the beneficial impacts of Tarot in a therapeutic setting would involve examining a greater number of participants from a wider variety of backgrounds, so that this research could be generalized to a larger audience. Regardless of the reasoning behind why a person may use Tarot cards, there is no doubt that Tarot cards have maintained a strong presence in society, and these cards have the potential to do more than just “predict the future.”

Literature Cited 

  1. APA Dictionary of Psychology. “APA Dictionary of Psychology.” Apa.org, 2014, dictionary.apa.org/barnum-effect.
  2. “History.” Tarot Heritage, 24 July 2011, tarot-heritage.com/history-4/. Accessed 13 Apr. 2024.
  3. Hofer, Gigi Michelle. “Tarot cards: an investigation of their benefit as a tool for self reflection.” University of Victoria PhD diss (2009).
  4. Ivtzan, Itai. “Tarot cards: a literature review and evaluation of psychic versus psychological explanations.” Journal of Parapsychology 71 (2007).
  5. Macsparrow, Mark. “Many Major Arcana Cards in a Reading Means Many Changes Ahead.” Medium, 12 May 2021, tarotreadings.medium.com/many-major-arcana-cards-in-a-reading-means-many-changes-ahead-516becf2faf5. Accessed 13 Apr. 2024.
  6. Willis, T. Magick and the tarot. Wellingborough, UK: Aquarian (1988).

Filed Under: Psychology and Neuroscience, Science Tagged With: barnum effect, mental health, tarot cards, therapy

Ending the Biomedical Harvest: Synthetic Alternatives to Horseshoe Crab Blood for Bacterial Endotoxin Detection

December 3, 2023 by Gabe O'Brien

Did you know that horseshoe crabs have incredible immune systems? In fact, horseshoe crabs have the best immune systems out of all living invertebrates. Their secret? Blood. Horseshoe crab blood is very simple in composition, with only a single cell type in general circulation (the granular amebocyte) and only three proteins in the plasma of the blood (hemocyanin, C-reactive proteins, and a2-macroglobulin) (Armstrong et al., 2008). These proteins contribute to the horseshoe crab’s blood clotting system, protecting them from infection. Horseshoe crab blood has been found to be very sensitive to bacterial endotoxins found in illness-causing Gram-negative bacteria (Protecting Health). When horseshoe crab blood cells come into contact with bacterial endotoxin, they clot around it, preventing the bacterium from invading nearby cells (Natural History Museum 2020). 

With the rise of vaccine development, especially in the case of the Covid-19 pandemic, horseshoe crab blood plays an essential role in testing the safety of vaccines due to its endotoxin-detection properties. Additionally, large volumes of horseshoe crab blood can be collected easily, making it a convenient blood source (Armstrong et al., 2008). Despite all the beneficial applications of horseshoe crab blood, horseshoe crab bleeding leaves thousands of horseshoe crabs dead annually, causing their populations to be in decline (Maloney et al., 2018). A 2018 study has promoted a synthetic alternative to horseshoe crab blood, recombinant Factor C (rFC), and proven its efficacy in bacterial endotoxin detection. The use of rFC in vaccine development can eliminate the need for the use of actual horseshoe crab blood, sparing the horseshoe crab and promoting the conservation of this endangered species. 

Typically, horseshoe crab blood is collected by the direct puncture of the heart under sterile conditions that minimize contamination by bacterial endotoxins (Figure 1). A large horseshoe crab can produce between 200 – 400 mL of blood, and the blood clotting system can be studied microscopically. The limitation of contamination by bacterial endotoxins is extremely important in the blood collection process, because cell clotting will compromise the effectiveness of the blood for its intended use of developing vaccines. Only undamaged horseshoe crabs are selected for blood collection, and the animal is bled by the insertion of a needle into the heart through the outer hinge joint of the horseshoe crab (Figure 2). The animal is then squeezed gently so that as much blood as possible can be deposited into the collection tube (Armstrong et al., 2008).

Figure 1: Horseshoe crab bleeding on a larger scale, with precautions taken to ensure sanitary, endotoxin-free conditions for blood collection.

Figure 2: The three major components of the body of a horseshoe crab, including the prosoma (P), the opisthosoma (O), and the telson (T). The hinge (H) is where the prosoma meets the opisthosoma, and that is where the needle is inserted for blood collection. 

Following collection, horseshoe crab blood is ready for use in endotoxin detection (Armstrong et al., 2008). For example, in vaccine development, a Limulus amebocyte lysate (LAL) test detects the levels of clotting in horseshoe crab blood when it comes into contact with different vaccines. Horseshoe crab blood is very precise with detecting even small traces of endotoxin, making it an effective tool to identify small quantities of endotoxin present in potential vaccines (Protecting Health).  

Although horseshoe crab blood is effective in its ability to detect endotoxins, recombinant Factor C (rFC) can do the same job in a way that is more ecologically sustainable. Initially, rFC was discovered by scientists at the National University of Singapore, allowing them to visualize endotoxin detection using animal-free technology. Every year over 500,000 horseshoe crabs are captured and as much as ⅓ of their blood is drained, contributing to high mortality rates. On top of this, around 13% of the horseshoe crabs bled are later sold for bait, resulting in nearly 130,000 horseshoe crab victims to the biomedical industry. A 2018 study confirmed that the biomedical industry could reduce their use of horseshoe crab blood by nearly 90% if they were to employ rFC as a synthetic alternative for endotoxin detection processes. The 2018 study reviews multiple studies that show how rFC is just as effective as actual horseshoe crab blood in endotoxin detection, as rFC has been able to demonstrate the same high rate and sensitivity as horseshoe crab blood in detecting small amounts of endotoxin in a wide range of chemical structures. When endotoxin binds to a synthetic rFC molecule, it causes the rFC to fluoresce directly proportional to the concentration of endotoxin in a substance. rFC has even been able to demonstrate a higher rate of specificity for endotoxin detection (compared to horseshoe crab blood) in some studies (Maloney et al., 2018).

The most important next step of this research is to get synthetic rFC into the hands of the biomedical industry. Exposure to endotoxin can cause serious illness, making endotoxin detection for vaccines an essential part of the vaccine development process.  Even though there is ample evidence that rFC is equivalent to or better than horseshoe crab blood at detecting bacterial endotoxin, there are still limitations to the usage of rFC, as it is difficult for the biomedical industry to adopt new technologies quickly. Endotoxin detection testing is very highly regulated, so many pharmaceutical manufacturers may be hesitant to employ new detection technologies, as they may want to stick to traditional methods instead (Maloney et al., 2018). Despite these limitations, in order to progress towards horseshoe crab conservation, rFC should be produced and employed on a large scale so that the biomedical industry will no longer be solely reliant on the exploitation of horseshoe crabs for bacterial endotoxin detection.

Literature Cited

1. Armstrong, P., Conrad, M. Blood Collection from the American Horseshoe Crab, Limulus Polyphemus. J. Vis. Exp. (20), e958, doi:10.3791/958 (2008). 

2. “Horseshoe Crab Blood: The Miracle Vaccine Ingredient That’s Saved Millions of Lives.” Www.nhm.ac.uk, www.nhm.ac.uk/discover/horseshoe-crab-blood-miracle-vaccine-ingredient.html#:~:text=Horseshoe%20crab%20blood%20is%20bright.  

3. Maloney T, Phelan R, Simmons N. Saving the horseshoe crab: A synthetic alternative to horseshoe crab blood for endotoxin detection. PLoS Biol. 2018 Oct 12;16(10):e2006607. doi: 10.1371/journal.pbio.2006607. PMID: 30312293; PMCID: PMC6200278.  

4. “Protecting Health.” Www.horseshoecrab.org, www.horseshoecrab.org/med/health.html. Accessed 12 Nov. 2023.  



Filed Under: Biology, Chemistry and Biochemistry, Environmental Science and EOS Tagged With: Biology, blood, clinical testing, conservation, horseshoe crabs, Medicine, vaccine development

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