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The effect occurs when missing phonemes in an auditory signal are replaced with a noise that would have the physical properties to mask those phonemes, creating an ambiguity. In such ambiguity, the brain tends towards filling in absent phonemes. The effect can be so strong that some listeners may not even notice that there are phonemes missing.
Available published tests of phonological awareness (for example PhAB2 [7]) are often used by teachers, psychologists and speech therapists to help understand difficulties in this aspect of language and literacy. Although the tasks vary, they share the basic requirement that some operation (e.g., identifying, comparing, separating, combining ...
A phoneme is a sound or a group of different sounds perceived to have the same function by speakers of the language or dialect in question. An example is the English phoneme /k/, which occurs in words such as cat, kit, scat, skit.
Figure 4: Example identification (red) and discrimination (blue) functions. Categorical perception is involved in processes of perceptual differentiation. People perceive speech sounds categorically, that is to say, they are more likely to notice the differences between categories (phonemes) than within categories.
Phoneme isolation: which requires recognizing the individual sounds in words, for example, "Tell me the first sound you hear in the word paste" (/p/). Phoneme identity: which requires recognizing the common sound in different words, for example, "Tell me the sound that is the same in bike, boy and bell" ( /b/ ).
[14] [16] That is, adults and infants are both more likely to notice that a particular phoneme differs from the referent phoneme if that referent phoneme is a non-prototypical exemplar than if it is a prototypical exemplar. The prototypes themselves are apparently discovered through a distributional learning process, in which infants are ...
This effect may be experienced when a video of one phoneme's production is dubbed with a sound-recording of a different phoneme being spoken. Often, the perceived phoneme is a third, intermediate phoneme. As an example, the syllables /ba-ba/ are spoken over the lip movements of /ga-ga/, and the perception is of /da-da/.
There are three types of connectivity: (1) feedforward excitatory connections from input to features, features to phonemes, and phonemes to words; (2) lateral (i.e., within layer) inhibitory connections at the feature, phoneme and word layers; and (3) top-down feedback excitatory connections from words to phonemes.