question: How come we can sometimes hear our digestion but not other bodily processes?
comment: What soundless bodily processes are you refrencing? If the environment is quiet enough you can hear you heart beating. In a totally silent environment (like in an anechoic chamber) a you can hear blood circulating, and the spontaneous firing of your auditory nerve. The reason your stomach is louder than these is due to the girth of your intestines and what you put through then, compared to your blood vessels and nerves.
passages: Some controversy exists as to the length of time required to confirm or exclude bowel sounds, with suggested durations up to seven minutes. Bowel obstruction may present with grumbling bowel sounds or high-pitched noises. Healthy persons can have no bowel sounds for several minutes and intestinal contractions can be silent. Hyperactive bowel sounds may be caused by partial or complete bowel obstruction as the intestines initially try to clear the obstruction. Absence of sounds may be caused by peritonitis, paralytic ileus, late-stage bowel obstruction, intestinal ischemia or other causes. Some authors suggest that listening at a single location is enough as sounds can be transmitted throughout the abdomen.
   BULLET::::- Superior canal dehiscence, which can lead to an abnormally amplified bone conduction of sound into the inner ear. Persons with superior canal dehiscence syndrome (SCDS) typically hear not only their own voice but also heartbeat, footsteps, chewing, intestinal sounds and possibly even the sound of their eye movements when reading.
  
  Section::::External links.
  
  BULLET::::- Definition of Autophony
  
  BULLET::::- Painhealth.com - Definition of Autophony
  
  BULLET::::- emedicine Patulous Eustachian Tube
  
  BULLET::::- SCDS with Autophony
  
  BULLET::::- SCDS with Autophony - animation
  
  BULLET::::- "Doctor, I can hear my eyes" - W Albuquerque, A M Bronstein
   The first MythBusters episode involving the company was “busting” the myth that a duck's quack will not echo. The second time was the infamous “Brown Note” episode, which explored the myth that a person subjected to high levels of very low-frequency sound could experience “involuntary intestinal motility." In the course of busting this myth, John Meyer became interested in the physical aspect of transmission of very low frequencies.
   Slow waves are generated at unique intrinsic frequencies by the interstitial cells of Cajal, even within the same organ. Entrainment of these different intrinsic frequencies through electrical coupling allows these unique intrinsic frequencies to occur at a single frequency within the stomach and segments of the small intestine. Electron microscopic and dye coupling studies to date have confirmed gap junctions as the major coupling mechanisms between interstitial cells of Cajal 
   BULLET::::- Stomach rumbles can form further along the gastrointestinal system when air is swallowed while talking, eating, and drinking. This phenomenon occurs in most people and is typical.
  
  Section::::Diseases and conditions.
  
  BULLET::::- Celiac disease is a condition that prevents the small intestine from absorbing parts of food that are needed to stay healthy. Consuming food containing gluten is dangerous for people with this disease: Intestinal villi help to absorb nutrients from food, but when gluten is consumed, the immune system attacks these villi as a result. Symptoms may include abdominal pain, nausea, and bulky or foul smelling stools.
   Intestinal slow waves occur at around 12 cycles-per-minute in the duodenum, and decreases in frequency towards the colon. Entrainment of intestinal slow waves forms “frequency plateaus” in a piece-wise manner along the intestine. Similar to the stomach, intestinal slow waves frequency, propagation velocity, and amplitude also demonstrate significant inter-species differences.
  
  In uterine smooth muscle, slow waves have not been consistently observed. Uterine muscle seems to generate action potentials spontaneously.
   It may be the case that it is not necessary and maybe even not possible for a listener to recognize phonemes before recognizing higher units, like words for example. After obtaining at least a fundamental piece of information about phonemic structure of the perceived entity from the acoustic signal, listeners can compensate for missing or noise-masked phonemes using their knowledge of the spoken language. Compensatory mechanisms might even operate at the sentence level such as in learned songs, phrases and verses, an effect backed-up by neural coding patterns consistent with the missed continuous speech fragments, despite the lack of all relevant bottom-up sensory input.
   The primary auditory cortex is surrounded by secondary auditory cortex, and interconnects with it. These secondary areas interconnect with further processing areas in the superior temporal gyrus, in the dorsal bank of the superior temporal sulcus, and in the frontal lobe. In humans, connections of these regions with the middle temporal gyrus are probably important for speech perception. The frontotemporal system underlying auditory perception allows us to distinguish sounds as speech, music, or noise.
  
  Section::::Neuronal structure.:The auditory ventral and dorsal streams.
   Section::::Animal sounds.
   The human gastrointestinal tract is around 9 meters long. Food digestion physiology varies between individuals and upon other factors such as the characteristics of the food and size of the meal, and the process of digestion normally takes between 24 and 72 hours.
   Section::::Initiating ingestion.:Metabolic signals.
  
  Hunger is the result of a fall in blood glucose level or depriving cells of the ability to metabolize fatty acids—glucoprivation and lipoprivation, respectively, stimulate eating. Detectors in the brain are only sensitive to glucoprivation; detectors in the liver are sensitive to both glucoprivation and lipoprivation outside the blood–brain barrier. However, no single set of receptors is solely responsible for the information the brain uses to control eating.
  
  Section::::Satiety signals.
   Jürgen Altmann of the Dortmund University of Technology, an expert on sonic weapons, has said that there is no reliable evidence for nausea and vomiting caused by infrasound.
  
  High volume levels at concerts from subwoofer arrays have been cited as causing lung collapse in individuals who are very close to the subwoofers, especially for smokers who are particularly tall and thin.
   Section::::Cast.
  
  BULLET::::- Enid Bennett as Nora
  
  BULLET::::- Albert Ray as James Waterson Forbes (as Al Ray)
  
  BULLET::::- Gertrude Claire as Undetermined Role
  
  BULLET::::- Jack Nelson as 'Soup' McCool
  
  BULLET::::- Robert McKim as 'Pug' Hennessy
  
  BULLET::::- Frank Hayes as Martin Grubb
  
  BULLET::::- Caroline Rankin, Undetermined Role
  
  Section::::Critical reception.
   BULLET::::1. Hockett suggests that the importance of a vocal-auditory channel lies in the fact that the animal can communicate while also performing other tasks, such as eating, or using tools.
  
  BULLET::::2. Broadcast Transmission and Directional Reception: An auditory|audible human language signal is sent out in all directions but is perceived in a limited direction. For example, humans are more proficient in determining the location of a sound source when the sound is projecting directly in front of them, as opposed to a sound source projected directly behind them.
   These cues are also used by other animals, but there may be differences in usage, and there are also localization cues which are absent in the human auditory system, such as the effects of ear movements. Animals with the ability to localize sound have a clear evolutionary advantage.
  
  Section::::How sound reaches the brain.
   A series of radiographs can be used to examine the stomach for various disorders. This will often include the use of a barium swallow. Another method of examination of the stomach, is the use of an endoscope. A gastric emptying scan is considered the gold standard to assess gastric emptying rate.
  
  A large number of studies have indicated that most cases of peptic ulcers, and gastritis, in humans are caused by "Helicobacter pylori" infection, and an association has been seen with the development of stomach cancer.
  
  A stomach rumble is actually noise from the intestines.
   There are six Universities in Australia that offer graduate programs (via course work and/or research degrees) in Audiology for local and overseas students. All programs offered are recognised as eligible for membership of the Society - Audiology Australia and the International Society of Audiology (ISA).
  
  BULLET::::- University of Western Australia
  
  BULLET::::- University of Melbourne
  
  BULLET::::- Flinders University
  
  BULLET::::- La Trobe University
  
  BULLET::::- Macquarie University
  
  BULLET::::- University of Queensland
  
  Section::::Requirements.:Bangladesh.
   BULLET::::2. Broadcast transmission and directional reception: All human language can be heard if it is within range of another person's auditory channel. Additionally, a listener has the ability to determine the source of a sound by binaural direction finding.
  
  BULLET::::3. Rapid Fading (transitoriness): Wave forms of human language dissipate over time and do not persist. A hearer can only receive specific auditory information at the time it is spoken.
  
  BULLET::::4. Interchangeability: A person has the ability to speak and hear the same signal. Anything that a person is able to hear can be reproduced in spoken language.
   There are several sets of receptors located in the head: eyes, nose, tongue, and throat. The most important role of head factors in satiety is that taste and odor can serve as stimuli that permit learning about caloric contents of different foods. Tasting and swallowing of food contributes to the feeling of fullness caused by the presence of food in the stomach.
  
  Section::::Satiety signals.:Short-term signals.:Gastric and intestinal factors.
   Long and Allen were the first investigators to report the abnormal brainstem auditory evoked potentials (BAEPs) in an alcoholic woman who recovered from acquired central hypoventilation syndrome. These investigators hypothesized that their patient's brainstem was poisoned, but not destroyed, by her chronic alcoholism.
  
  Section::::Sensory evoked potentials.:Steady-state evoked potential.
   Neurons within the ear respond to simple tones, and the brain serves to process other increasingly complex sounds. An average adult is typically able to detect sounds ranging between 20 and 20,000 Hz. The ability to detect higher pitch sounds decreases in older humans.
   Section::::Acoustics.:Hearing.
   Section::::Motility.:Contraction patterns.
  
  The patterns of GI contraction as a whole can be divided into two distinct patterns, peristalsis and segmentation. Occurring between meals, the migrating motor complex is a series of peristaltic wave cycles in distinct phases starting with relaxation, followed by an increasing level of activity to a peak level of peristaltic activity lasting for 5–15 minutes.
  
  This cycle repeats every 1.5–2 hours but is interrupted by food ingestion. The role of this process is likely to clean excess bacteria and food from the digestive system.
  
  Section::::Motility.:Contraction patterns.:Peristalsis.
   Most of the digestion of food takes place in the small intestine which is the longest part of the GI tract.
  
  A major digestive organ is the stomach. Within its mucosa are millions of embedded gastric glands. Their secretions are vital to the functioning of the organ.
  
  There are many specialised cells of the GI tract. These include the various cells of the gastric glands, taste cells, pancreatic duct cells, enterocytes and microfold cells.
  
  Some parts of the digestive system are also part of the excretory system, including the large intestine.
  
  Section::::Components.:Mouth.
   Section::::Research in the U.S..
  
presuppositions: We cannot hear sounds from our bodily processes except our digestion. Digestion is the only bodily process we can hear.
corrections: We can hear sounds from our bodily processes not just our digestion if the environment is quiet enough. Many bodily processes can be heard.
raw_presuppositions: We cannot hear sounds from our bodily processes except our digestion. Digestion is the only bodily process we can hear.
raw_corrections: We can hear sounds from our bodily processes not just our digestion if the environment is quiet enough. Many bodily processes can be heard.