Related Experiment Video
Updated: May 31, 2026
07:52
An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
Published on: March 13, 2026
Memory for the locations of environmental sounds
Russell L Martin1, Patrick Flanagan, Ken I McAnally
1Air Operations Division, Defence Science and Technology Organisation, Fishermans Bend 3207, Australia. russell.martin@dsto.defense.gov.au
The Journal of the Acoustical Society of America
|June 21, 2011
Summary
Determining the absolute locations of multiple sound sources is challenging. Accuracy decreases with more sounds, but repeating sound sequences improves localization memory in virtual auditory space.
Area of Science:
- Auditory perception
- Spatial hearing
- Human psychoacoustics
Background:
- Single sound source localization is well-studied.
- Limited research exists on localizing multiple sound sources simultaneously.
- Understanding multi-source sound localization is crucial for applications like virtual reality and augmented audio.
Purpose of the Study:
- To assess human ability to determine and remember absolute locations of multiple environmental sound sources.
- To investigate the impact of the number of sound sources on localization accuracy.
- To examine the effect of sequence repetition and target sound nomination timing on spatial memory.
Main Methods:
- Participants localized up to six environmental sound sources in virtual auditory space (azimuth and elevation).
- Experiment 1: Varied number of sounds (1-6) and sequence repetitions (1, 3, 5), target nominated post-sequence.
- Experiment 2: Constant memory load, target nominated pre-sequence, single sequence presentation.
Main Results:
- Localization accuracy decreased significantly with three or more sounds in Experiment 1.
- Repeating sound sequences improved localization accuracy in Experiment 1.
- Primacy and recency effects were prominent in multi-sound conditions (Experiment 1).
- Temporal errors, not spatial errors, were over-represented in multi-sound conditions.
Conclusions:
- Human ability to localize multiple sound sources is limited by the number of sources.
- Sequence repetition and nomination timing influence spatial memory and localization accuracy.
- Temporal factors play a significant role in errors when localizing multiple sounds.
More Related Videos
Related Concept Videos
01:31Hearing
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
01:21Perceiving Loudness, Pitch, and Location
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by identifying...
01:14Sensory Memory
Sensory memory captures information from the environment in its original form for a very brief duration, just long enough to be exposed to visual, auditory, and other senses. This type of memory is detailed and rich but quickly lost unless certain strategies are employed to transfer it into short-term or long-term memory. Sensory information is continuously bombarding the human brain, yet only a small fraction is absorbed, as most of it does not significantly impact daily life. For instance,...
01:26Higher Mental Functions of Brain: Learning and Memory
Memory is one of the most vital higher mental functions of the brain. Memory is closely related to learning because it enables us to retain information and experiences from our past to use them in our present life. It also helps us to remember facts, events, and skills, such as riding a bike or swimming. There are two types of memory — declarative memory, which involves memorizing facts or events, and procedural memory, which enables us to remember how to do something like writing or playing an...
01:23System of Memory
Memory is categorized into three major systems: sensory memory, short-term memory (STM), and long-term memory (LTM). These systems differ in their capacity and the duration for which they can hold information. Sensory memory captures raw sensory input from the environment, holding it for just a few seconds or less. For example, on hearing a brief, loud sound, like a car horn honking, the sound seems to linger in the mind for a moment even after it stops. This is an instance of sensory memory...
01:15Auditory Pathway
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...