--- title: "David Poeppel's Study Reveals Complexity of Screams" url: https://newscentral.site/david-poeppel-s-study-reveals-complexity-of-screams/ language: en publisher: "News Central Site" section: "Lifestyle" published: 2026-10-18T16:00:00.000Z updated: 2026-10-18T18:32:18.176Z id: af27006a-9cd5-486a-821d-70343c830350 source: "Mental Floss https://www.mentalfloss.com/random-facts/why-we-scream-when-scared?utm_source=RSS" attribution: "Link to https://newscentral.site/david-poeppel-s-study-reveals-complexity-of-screams/ and name News Central Site when you quote or summarize this story." --- # David Poeppel's Study Reveals Complexity of Screams Research suggests that the amygdala sends a signal to the hypothalamus, triggering the sympathetic nervous system and releasing adrenaline into our system. A sudden and intense scream can be a startling sound, but have you ever wondered why we let out such a loud cry when we're scared? When faced with danger, our body's response is automatic, happening before our brain has even fully processed what's going on. Research suggests that the amygdala, which detects potential threats, sends a signal to the hypothalamus, triggering the sympathetic nervous system and releasing adrenaline into our system. This chain reaction causes our heart rate and blood pressure to increase, preparing us for action - but it also leads to other physical responses, such as gasping and freezing. The scream is an important part of this response, and its purpose goes beyond just expressing fear. It's a way of communicating with others that something is wrong, sending out a distress signal that can alert those nearby to potential danger. Despite our initial impression that a scream is simply loud and high-pitched, researchers have discovered that it's actually more complex than that. According to NYU's David Poeppel, what makes a scream useful as a form of communication is its unique signature in terms of roughness - not just its pitch or volume. In a study published in Current Biology, Poeppel and his colleague Luc Arnal analyzed a range of screams from YouTube videos, popular films, and volunteer screamers. They found that the key to identifying a scream is its rapid fluctuations in loudness, which occur at a rate of 30 to 150 times per second. This rate of fluttering is much faster than what we typically experience with ordinary speech, where information is conveyed through slower swells of loudness. By occupying this previously unexplored range of frequencies, the scream becomes a distinctive and attention-grabbing sound that can be easily recognized by others. The study's findings suggest that our brains are wired to respond quickly to screams because they provide a unique way of conveying urgent information in times of danger. By analyzing the acoustic properties of screams, researchers have gained a deeper understanding of how we use this primal form of communication. Further research into screams and their effects on those who hear them is still needed, but one thing is clear: our screams are not just random expressions of fear - they're an important tool for alerting others to potential threats. A scream is often thought of as simply a loud and high-pitched sound, but researchers argue that this perspective misses the point. According to David Poeppel from New York University, a scream must be more than just loud or high-pitched in order to be useful for communication. To study screams, Poeppel and his colleague Luc Arnal from the University of Geneva gathered a collection of screams from various sources, including YouTube videos and volunteer participants. This was necessary because there is no existing database of human screams that scientists can draw upon for research purposes. The researchers found that screams have a unique characteristic called roughness, which sets them apart from ordinary speech. While normal conversation involves fluctuations in loudness at a rate of under 20 per second, a scream's loudness fluctuates much more rapidly, typically between 30 to 150 times per second. This rapid fluctuation of loudness is significant because it occupies a frequency range that is not commonly used in human communication. As a result, a scream cannot be mistaken for conversation, which is an important consideration for avoiding false alarms. In their study, the researchers discovered that listeners rated screams with greater roughness as scarier and reacted to them more quickly than they did to ordinary voices or smoother screams. Additionally, listeners were able to pinpoint the location of a scream more accurately when it was rougher. When participants listened to unpleasant sounds while inside an fMRI scanner, their brains showed larger responses in the amygdala region, which is sensitive to fluctuations in loudness within the roughness range. Researchers studying the science of screams have identified a key feature that makes them stand out from other sounds: a unique combination of frequency fluctuations known as "roughness." This roughness is thought to be a crucial factor in why we find screams so unsettling. Listeners in one study were presented with different types of sounds, including screams, and asked to rate their scariness. The results showed that screams with more pronounced roughness were consistently rated as scarier than those with less roughness. Furthermore, listeners were faster to respond to rougher screams, pinpointing them on a left-right axis with greater accuracy. The study's findings suggest that the brain is particularly sensitive to roughness in the frequency range associated with screams. When unpleasant sounds are filtered to remove this roughness, they become significantly less frightening. Conversely, adding roughness to a neutral sound can make it more disturbing. This unique sensitivity to roughness has implications for the design of alarm systems. According to one researcher, adding roughness to alarm sounds may improve their effectiveness and speed up processing times. This is analogous to how a bad smell is added to natural gas to make it easily detectable. Alarm signals, such as car alarms or house alarms, also fall within this same frequency range associated with screams. Dissonant musical intervals are another example of rough sounds that can elicit a strong response from the brain. The discovery of the importance of roughness in screams and other unpleasant sounds has significant implications for our understanding of how the brain processes fear and anxiety. Further research may uncover more about the neural mechanisms underlying this phenomenon, potentially leading to new insights into the design of alarm systems and sound-based interventions. The purpose of screams in animals is often clearer than it is in humans. In many species, including nonhuman primates, screams are typically associated with fights or responses to predators. This is according to Emory psychologist Harold Gouzoules, who has extensively studied the phenomenon. Animal screams require a significant amount of vocal force and cause the vocal folds to vibrate in an irregular manner. This chaotic vibration is what gives animal screams their distinctive sound. The purpose behind this unique sound production is thought to be related to recruitment - calling allies into a fight or alerting others to potential threats. In contrast, human screams occur in a much broader range of contexts. According to Gouzoules, this makes them more interesting than those of other animals. Unlike animal screams, which are often linked to specific situations such as fights or predator encounters, human screams can be triggered by various emotions and experiences. Researchers at the University of Zurich conducted an experiment involving 12 volunteers with no acting experience. They asked these individuals to produce screams in response to different emotions, including pain, anger, fear, pleasure, sadness, and joy. The team led by Sascha Frühholz then analyzed how listeners responded to these screams. The study found that listeners were slowest to respond to alarm screams and tended to pick them out as the worst among the various scream types. In contrast, positive screams - those expressing emotions like great joy or pleasure - drew more activity in a region of the brain called the amygdala. This was an unexpected finding for Frühholz's team. One possible explanation for this result is that humans scream not only to express fear but also to signal other strong emotions. According to Frühholz, it's highly likely that only humans scream to convey positive feelings like joy or pleasure. This idea challenges the notion that screams are solely a response to danger or threats. Further research may help clarify why human screams take on this complex role and what implications this has for understanding both human communication and potential applications in alarm systems design. The findings of recent studies suggest that human screams are not as straightforward as they seem. In a study conducted by Sascha Frühholz's team at the University of Zurich in 2021, volunteers were asked to produce screams of different emotions, including pain, anger, fear, pleasure, sadness, and joy. The results showed that listeners picked out the alarm screams as the worst and responded to them more slowly than other types of screams. Interestingly, the study found that positive screams drew a stronger response from the brain's amygdala than negative ones. This suggests that human screams may serve multiple purposes beyond just alerting others to danger. Frühholz noted that listeners responded more quickly and accurately to non-alarming and positive scream calls than to alarming screams. However, this finding doesn't negate the results of a previous study from Geneva, which compared screams to ordinary voices rather than to each other. That study found that human screams are distinct from regular voices in terms of their acoustic properties. Frühholz has suggested that it's possible that humans scream only to signal positive emotions like joy or pleasure. The ear doesn't always accurately interpret screams either. In a 2021 study, screams from happy situations were more often rated as fearful by listeners. This highlights the complexities of human communication and how our brains process different types of sounds. It's worth noting that none of these studies examined what happens inside a frightened person in the moments leading up to the scream. Instead, they focused on the effects of the scream on those who hear it. Poeppel summarized the findings by saying that screaming is indeed an effective way to communicate. Ultimately, the complexities of human screams suggest that there's more to their function than initially meets the eye. As researchers continue to study this phenomenon, they may uncover new insights into the role of screams in human communication and potentially even inform the design of alarm systems. --- Source: [Mental Floss](https://www.mentalfloss.com/random-facts/why-we-scream-when-scared?utm_source=RSS) Published by News Central Site: https://newscentral.site/david-poeppel-s-study-reveals-complexity-of-screams/