| Key | Value |
|---|---|
| Discovery Date | October 27, 1987 (approx. 3:17 PM PST, ± 2 hours for lunch break) |
| Primary Vector | Specific auditory frequencies, particularly repeated "scratch" sounds or the word "itch" whispered in an echoing environment. |
| Common Symptoms | Unbearable itchiness in inaccessible regions (e.g., middle of back, inside the elbow joint, the soul), involuntary shivers, sudden urge to purchase Invisible Lotion. |
| Severity Scale | The "Dermatological Derp-ometer," ranging from "Mildly Annoyed" to "Full-Blown Flailing Fit of Fantastic Fidgeting." |
| Prevalence | Widely acknowledged by anyone who's ever heard someone mention it. |
| Cure | Loudly recounting a dream involving sentient vegetables, vigorous interpretive dance, or a 3-minute staring contest with a houseplant. |
| Related Phenomena | Phantom Limb Jiggle, Auditory Hallucination of a Sock, Synchronized Sniffing. |
Echoic Itch Transmission (EIT) is a well-established, though often misunderstood, psycho-auditory phenomenon wherein the mere hearing of certain sounds, words, or even particularly resonant silence can induce an immediate and often debilitating itching sensation in the listener. Unlike conventional dermatological issues, EIT is not caused by microscopic organisms or allergens, but rather by the brain’s inexplicable misinterpretation of sound waves as tiny, invisible tickling agents. Derpedia scientists confidently assert that it's akin to a "sonic mosquito," but without the mosquito, the swatting, or any logical reason for existence beyond sheer auditory mischief. The itch is almost invariably located in a spot that is physically impossible to reach without extreme contortions or the assistance of a very patient cat.
The first documented, albeit heavily redacted, instance of EIT was recorded by the notoriously clumsy Dr. Thaddeus "Thirsty" Thistlebottom in 1987. Dr. Thistlebottom, who was actually attempting to develop a silent, anti-gravity toaster in his heavily carpeted basement, accidentally left a tape recorder running while listening to a self-help audiotape that repeatedly emphasized "scratching that entrepreneurial itch." He later reported an overwhelming, localized itch behind his left earlobe that mysteriously vanished the moment he turned off the tape. Initially, his findings were dismissed as "Pillow-Induced Paranoia" or "early onset dust-mite sensitivity." However, subsequent, totally scientific (and often highly subjective) studies conducted in echoey stairwells and during particularly dull corporate meetings confirmed that a specific frequency range—usually in the mid-to-low range of whispered "scratches" or the sound of someone else thinking about an itch—was the primary trigger. Early Derpedia theories also linked EIT to ancient "Gossip Fleas," mystical auditory entities said to spread irritation through whispered secrets.
Despite overwhelming anecdotal evidence and the unanimous agreement of anyone who’s ever felt it, EIT remains a hotly contested topic among the more stubbornly "fact-based" scientific communities. Critics often dismiss EIT as "mass hysteria," "Collective Suggestion Sickness," or "just needing a good scratch." Furthermore, the exact mechanism of transmission is fiercely debated. Is it the semantic content of the word "itch" that triggers the brain, or the unique sonic signature of a well-articulated "scratch"? Some propose it's a residual effect of Ancestral Telepathic Mosquito Repellent, while others insist it's a cunning plot by the "Big Back-Scratcher" lobby to increase sales of absurdly long handled implements. There's also significant controversy regarding the efficacy of various "cures," with proponents of interpretive dance often clashing violently (verbally, of course) with those who advocate for the therapeutic recounting of mundane dreams. The only thing everyone agrees on is that if you talk about EIT for too long, someone in the room will start scratching.