Questions: Speech Production and Articulation Planning

Question 1

A person knows the meaning of the word they want to say, its grammatical category, and even its first letter and rough syllable count — but cannot retrieve the full pronunciation. Which stage of lexical access has succeeded and which has failed?

• A. Both lemma and lexeme retrieval have succeeded; this is a working memory failure
• B. Lemma retrieval has succeeded but lexeme retrieval has failed — the classic tip-of-the-tongue state
• C. Lexeme retrieval has succeeded but lemma retrieval has failed, leaving an empty sound without meaning
• D. Neither stage has completed; the word is simply not in the person's vocabulary

Answer: (B)

The tip-of-the-tongue phenomenon is the key evidence for a two-stage model. The lemma encodes meaning, syntactic properties, grammatical category, and partial phonological information (first letter, syllable count). When lemma retrieval succeeds but lexeme retrieval fails, exactly this partial information is available. Option C is the reverse — it describes retrieving a form without access to meaning, which is not what tip-of-the-tongue looks like.

Question 2

A speaker says 'tips of the slung' instead of 'tips of the tongue.' What does this spoonerism reveal about speech planning?

• A. Phonological encoding occurs word-by-word in strict sequence, and the error reflects an isolated encoding failure for 'tongue'
• B. Speech is planned across multiple words simultaneously, allowing phonological segments from different words to interact and transpose
• C. The speaker retrieved the wrong lemma, selecting a semantically related word
• D. Articulation programs for 'sl-' and 'st-' are stored in adjacent locations in motor cortex and were co-activated

Answer: (B)

Spoonerisms — transpositions of sounds across words — are only possible if the phonological segments of multiple upcoming words are active in the planning buffer at the same time. If encoding proceeded strictly word-by-word, the segment from 'tongue' could not interfere with 'tips.' This is the primary evidence that speech planning has a multi-word window. Option C describes a semantic substitution (wrong lemma), not a spoonerism (transposed phonemes).

Question 3

Introducing an artificial delay or pitch shift in a speaker's auditory feedback disrupts speech fluency, demonstrating that auditory monitoring is integrated into articulatory control — not just a post-hoc check.

• T. True
• F. False

Answer: True

The forward model of motor control predicts sensory consequences of planned movements before they occur. Speakers continuously compare predicted and actual auditory feedback. When the feedback is artificially delayed or shifted, the mismatch between prediction and input disrupts the ongoing motor control process, causing stuttering, prolonged sounds, or altered pitch — evidence that auditory prediction is embedded in real-time articulation, not merely reviewed after speech ends.

Question 4

Malapropisms (e.g., substituting 'pacific' for 'specific') arise from the same level of processing as semantic substitutions (e.g., substituting 'cat' for 'dog').

• T. True
• F. False

Answer: False

Malapropisms occur at the lexeme level: a phonologically similar word is retrieved instead of the target, indicating competition among phonological neighbors in the sound-encoding stage. Semantic substitutions occur at the lemma level: a semantically related word wins the lexical selection competition before any phonological encoding occurs. The two error types reveal distinct processing stages — semantic substitutions tell us about meaning-based competition; malapropisms tell us about sound-form competition.

Question 5

Why does the tip-of-the-tongue phenomenon support a two-stage model of lexical access rather than a single-stage model?

Model answer: In a single-stage model, either you retrieve the word or you don't — there would be no intermediate state with partial information. Tip-of-the-tongue states show that speakers can successfully access a word's meaning, grammatical category, and partial phonological form (first letter, syllable count) while failing to retrieve the complete phonological form. This pattern of partial access — exactly the split predicted if lexical retrieval has two stages (lemma, then lexeme) — cannot be explained by a single unified retrieval step.

The tip-of-the-tongue phenomenon is one of the most powerful pieces of evidence in psycholinguistics because it is a naturally occurring experiment: it reveals which properties of a word are accessible without full retrieval. The lemma-lexeme distinction predicts exactly the pattern observed — semantic and grammatical properties (lemma) succeed while phonological form (lexeme) fails.