Related Experiment Video
Updated: Jan 27, 2026
05:35
Experience is Instrumental in Tuning a Link Between Language and Cognition: Evidence from 6- to 7- Month-Old Infants' Object Categorization
Published on: April 19, 2017
7.1K
Natural speech statistics shift phoneme categorization
Christian E Stilp1, Ashley A Assgari2
1Department of Psychological and Brain Sciences, University of Louisville, 317 Life Sciences Building, Louisville, KY, 40292, USA. christian.stilp@louisville.edu.
Attention, Perception & Psychophysics
|March 20, 2019
Summary
Speech perception relies on context. This study shows the auditory system is sensitive to natural speech statistics, not just filtered sounds, influencing vowel categorization.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Psychoacoustics
Background:
- Speech sound recognition is influenced by surrounding acoustic properties.
- Spectral differences between context and target sounds bias auditory categorization.
- Previous research used filtered sounds, neglecting natural speech statistics.
Purpose of the Study:
- To investigate auditory system sensitivity to natural speech statistics in spectral context effects.
- To compare vowel categorization using filtered versus unfiltered speech stimuli.
- To assess the ecological validity of filtered stimuli in speech perception research.
Main Methods:
- Vowel categorization tasks were conducted using both filtered and unfiltered speech sentences.
- Stimuli varied in spectral composition, manipulating first formant (F1) frequencies.
- Experiment measured categorization biases under different context sound conditions.
Main Results:
- Vowel categorization was biased by both filtered and unfiltered context sentences.
- Larger spectral differences in context led to greater categorization biases.
- Biases were smaller and more variable with unfiltered (naturalistic) speech.
Conclusions:
- The auditory system is attuned to natural signal statistics in speech perception.
- Spectral context effects extend to more naturalistic listening conditions.
- Filtered stimuli may not fully replicate real-world speech perception phenomena.
Related Concept Videos
01:50Statistical Significance
21.3K
Once data is collected from both the experimental and the control groups, a statistical analysis is conducted to find out if there are meaningful differences between the two groups. A statistical analysis determines how likely any difference found is due to chance (and thus not meaningful). In psychology, group differences are considered meaningful, or significant, if the odds that these differences occurred by chance alone are 5 percent or less. Stated another way, if we repeated this...
21.3K
01:14Probability in Statistics
23.3K
Probability is the likelihood of an event occurring. The term event is defined as a collection of results of a procedure. An event is a simple event when an outcome cannot be divided into simpler parts.
An example of a simple event is a coin toss. The result of a coin toss is either a head or a tail. Here, head and tail are two simple events. These two simple events make up the sample space. Further, the probability of an event occurring falls within the range of 0 to 1. The probability of an...
An example of a simple event is a coin toss. The result of a coin toss is either a head or a tail. Here, head and tail are two simple events. These two simple events make up the sample space. Further, the probability of an event occurring falls within the range of 0 to 1. The probability of an...
23.3K
01:17Introduction to Statistics
63.2K
The science of statistics involves collecting, analyzing, interpreting, and presenting data. The method of collecting, organizing, and summarizing data is called descriptive statistics. The systematic method of drawing inferences from the sample data and predicting unknown characteristics of a population is called inferential statistics.
In statistics, the collection of individuals or objects under study is called population. The idea of sampling is to select a portion of the larger population...
In statistics, the collection of individuals or objects under study is called population. The idea of sampling is to select a portion of the larger population...
63.2K
01:11How Data are Classified: Categorical Data
44.2K
A variable, usually notated by capital letters such as X and Y, is a characteristic or measurement that can be determined for each member of a population. Data are the actual values of variables. They may be numbers, or they may be words. Datum is a single value.
Data are classified based on whether they are measurable or not. Categorical data cannot be measured; instead, it can be divided into categories. For example, if Y denotes a person's party affiliation, some examples of Y include...
Data are classified based on whether they are measurable or not. Categorical data cannot be measured; instead, it can be divided into categories. For example, if Y denotes a person's party affiliation, some examples of Y include...
44.2K
02:12The Wave Nature of Light
61.2K
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
61.2K
01:32What is Natural Selection?
128.1K
Natural selection is an evolutionary process in which individuals with survival-promoting traits reproduce at higher rates. These favorable traits become more common within a population or species. Naturally selected traits initially arise via random genetic mutations. In order for selection to occur, there must be variation within a population, the trait controlling the variation must be heritable, and there must be an evolutionary advantage for variation in the trait.
128.1K