This Is Your Brain on Parasites audiobook cover - How Tiny Creatures Manipulate Our Behavior and Shape Society

This Is Your Brain on Parasites

How Tiny Creatures Manipulate Our Behavior and Shape Society

Kathleen McAuliffe

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This Is Your Brain on Parasites
The Microscopic War+
Host Manipulation+
The Second Brain (Gut Microbiome)+
Cultural Evolution+

Quiz — Test Your Understanding

Question 1 of 6
What is one of the primary reasons parasites have been so successful in their microscopic war against humans?
  • A. They possess a rudimentary skeletal structure that resists human immune systems.
  • B. They greatly outnumber humans, reproduce at an incredible rate, and are highly adaptable.
  • C. They are completely immune to human physical defenses like stomach acid and mucous.
  • D. They only attack human populations when our immune systems are compromised by other diseases.
Question 2 of 6
How does the Guinea worm manipulate human behavior to ensure its reproductive cycle is completed?
  • A. It alters the host's brain chemistry to induce extreme thirst, driving the host to drink contaminated water.
  • B. It causes a burning blister on the host's skin, prompting the host to seek relief by placing the infected area in water.
  • C. It releases a chemical that makes the host's skin turn pink, attracting natural predators that live near water.
  • D. It attacks the enteric nervous system, causing severe digestive issues that expel the eggs into water sources.
Question 3 of 6
How does the jewel wasp turn a cockroach into a helpless 'zombie'?
  • A. By injecting poison into the roach's brain that limits the effects of octopamine, controlling muscle contraction.
  • B. By laying eggs directly into the roach's enteric nervous system, severing its connection to the brain.
  • C. By releasing a pheromone that causes the roach to voluntarily follow the wasp and protect it from predators.
  • D. By injecting dopamine into the roach's bloodstream, causing it to fall asleep for six days.
Question 4 of 6
According to a 2012 US study, what impact does the Toxocara roundworm have on infected children and teenagers?
  • A. It alters their physical appearance, leading to increased social isolation from their peers.
  • B. It causes them to perform significantly worse on cognitive tasks like math, reading comprehension, and IQ tests.
  • C. It induces a temporary zombie-like state where they lose control of their voluntary muscle movements.
  • D. It increases their production of serotonin, leading to abnormally high levels of energy and hyperactivity.
Question 5 of 6
What did the 2013 UCLA study involving probiotic yogurt and MRI scans suggest about the human body?
  • A. Consuming fermented foods significantly increases the brain's overall cognitive capacity and processing speed.
  • B. Gut bacteria can positively impact the brain and regulate how we process negative emotions.
  • C. The enteric nervous system is completely independent and does not communicate with the primary brain.
  • D. Parasites found in dairy products are responsible for increasing feelings of anger and fear.
Question 6 of 6
According to researchers at the University of New Mexico, how might the high prevalence of parasitic infections near the equator have influenced local human cultures?
  • A. It led to the development of highly individualistic societies that prioritize personal space.
  • B. It resulted in a dietary preference for bland foods, as spices were found to exacerbate parasitic infections.
  • C. It fostered collectivist cultures and a preference for spicier foods that help kill bacteria.
  • D. It caused a shift toward highly extroverted behaviors to build stronger communal immunities.

This Is Your Brain on Parasites — Full Chapter Overview

This Is Your Brain on Parasites Summary & Overview

This Is Your Brain on Parasites (2016) is about the microscopic organisms that live inside us. They sometimes make us sick and, more surprisingly, they drive human evolution in a variety of ways. These blinks explain how parasites can guide personalities, emotions and even culture.

Who Should Listen to This Is Your Brain on Parasites?

  • Psychologists and doctors, and students of either field
  • Anyone interested in free will
  • People interested in human behavior

About the Author: Kathleen McAuliffe

Kathleen McAuliffe is a science journalist who garnered a great deal of attention for her piece How Your Cat is Making You Crazy, which was published in the Atlantic. In addition to this work, she has been published in the New York Times magazine as well as the Smithsonian.

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