(a) What are the various levels of linguistic analysis? (b) How does Aitchison explain how research inlexical ambiguity, tip-of-the-tongue and speech errors shed light on word retrieval and overall speech production/comprehension problems?

Check the explanation

Explanation:

A. The scientists who are scholars in the aspect of languages are known as linguists. What they do is to define language by studying diverse aspects of human language, including words (morphology), sounds (phonetics, phonology), sentences (syntax), and meaning (semantics).

B. Slips of the tongue in whatever forms or situations are errors which happen involuntarily in spontaneous or unplanned speech. Overall speech errors are classified for numerous reasons which includes: normal brain, normal retrieval cues, rule-governed (they follow conventional patterns, a type of error that keeps re-occurring)