sentence: Subjects are superfluous.
sentences_before: Inner speech is not comparable in form to external speech. External speech is the process of turning thought into words. Inner speech, for example, contains predicates only.
sentences_after: Words are also used much more economically. One word in inner speech would take many words to express it in external speech.
concept_name: subject
headings: Lev Vygotsky 'Thought and Language'
categories: Psychologists Russian scientists