Language Production and Perception Mechanisms
Language Production Stages
This stage transforms the idea into linguistic form, known as Formulation.
a) Grammatical Encoding
- Selection of lemmas (words with syntactic info).
- Assignment of grammatical roles (subject, object).
- Construction of syntactic structure.
- Agreement features (tense, number).
b) Phonological Encoding
- Retrieval of phonological form.
- Syllabification.
- Stress assignment.
- Phoneme ordering.
Articulation
- Motor cortex activates speech muscles.
- Speech is physically produced.
- Highly automated process.
Evidence from Speech Errors
Speech errors are systematic and reveal how language is organized. Types:
- Anticipations
- Perseverations
- Exchanges
- Blends
Important observations:
- Errors respect syntactic category.
- Sounds usually move within the same position.
- Stress patterns are preserved.
Tip-of-the-Tongue (TOT) Phenomena
- Semantic information is available.
- Phonological form is partially blocked.
Evidence:
- First letter often retrieved.
- Number of syllables often known.
Self-Monitoring
Speakers monitor their speech internally.
Perceptual Loop Theory
- We “hear” our own inner speech.
- Corrections happen before articulation sometimes.
Chapter 6: Speech Perception and Word Recognition
Speech Perception Challenges
Speech perception is complex because:
- There are no clear word boundaries.
- Coarticulation changes sounds.
- Acoustic signal is variable.
- Different speakers produce different signals.
Categorical Perception
Listeners:
- Perceive speech sounds in categories.
- Do not detect gradual acoustic differences.
Word Segmentation
Listeners use multiple cues:
- Stress patterns (English: strong syllables mark beginnings).
- Phonotactic constraints.
- Context.
- Transitional probabilities.
Lexical Access
Cohort Model
- Word recognition begins with initial sounds.
- All candidates activated.
- Incorrect ones eliminated as signal continues.
- Recognition occurs at uniqueness point.
Limitations:
- Too linear.
- Does not explain misperceptions well.
Chapter 7: Sentence Processing (Parsing)
Parsing = building syntactic structure during comprehension.
Characteristics:
- Incremental
- Rapid
- Mostly automatic
The brain does not wait until sentence ends.
Garden Path Sentences
These show:
- The parser initially chooses the simplest structure.
- Reanalysis is costly.
Example type: Temporary ambiguity.
This supports the idea of:
- Initial syntactic preference.
- Later semantic correction.
Parsing Strategies
Minimal Attachment
- Choose simplest syntactic structure.
Late Closure
- Attach new words to the current phrase.
These principles explain many misinterpretations. Modular vs Interactive Debate
Working Memory
Comprehension difficulty increases with:
- Center-embedding.
- Long-distance dependencies.
- Structural complexity.
Working memory limitations explain processing breakdown.
Chapter 8: Meaning Representation
Surface Structure vs Meaning
People:
- Forget exact wording quickly.
- Remember propositional meaning.
Surface memory is short-lived.
Propositional Representation
Sentences stored as:
- Abstract meaning units.
- Not literal strings.
This explains paraphrasing ability.
Discourse Processing
Understanding longer texts requires:
- Building mental models.
- Linking sentences.
- Maintaining coherence.
Listeners integrate:
- Prior knowledge.
- Context.
- Inferences.
Inference
Readers automatically:
- Fill missing information.
- Make causal connections.
- Interpret pronouns.
Inference is essential for comprehension.