| A) | A form of communication, whether spoken, written, or signed, that is based on a system of symbols.
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| B) | In Piaget's theory, actions or mental representations that organize knowledge.
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| C) | Piaget's third sensorimotor substage, which develops between 4 and 8 months of age.
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| D) | The use of short and precise words without grammatical markers such as articles, auxiliary words, and other connectives.
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| E) | Chomsky's term to describe a biological endowment for language features and use.
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| F) | Language spoken in a higher pitch than normal, with simple words and sentences.
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| G) | Piaget's sixth and final sensorimotor substage, which develops between 18 and 24 months of age.
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| H) | In the Gesell assessment of infants, the An overall score that combines subscores in motor, language, adaptive, and personal-social domains in the Gesell assessment of infants.
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| I) | A loss or impairment of language ability caused by brain damage.
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| J) | The Piagetian term for one of an infant's most important accomplishments: understanding that objects and events continue to exist, even when they cannot directly be seen, heard, or touched.
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| K) | The first Piaget stage, in which infants construct an understanding of the world through sensory experiences and motor actions.
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| L) | A central feature of cognitive development, involving retaining information over time.
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| M) | Memory of facts and experiences that we consciously know and can state.
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| N) | Scales used widely in assessment of infant development, developed by Nancy Bayley.
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| O) | The way words are combined to form acceptable phases and sentences.
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| P) | Piaget's concept of grouping isolated behaviors into a higher-order, more smoothly functioning cognitive system; the grouping or arranging of items into categories.
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| Q) | When infants make the mistake infants make by of selecting the familiar hiding place (A) rather than the new hiding place (B), as they progress into Piaget's substage 4 in sensorimotor development.
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| R) | Piaget's first sensorimotor substage, which corresponds to the first month after birth.
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| S) | An area of the brain's left hemisphere involved in language comprehension.
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| T) | Units of meaning involved in word formation.
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| U) | Piaget's second sensorimotor substage, which develops between 1 and 4 months of age.
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| V) | The meaning of words and sentences.
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| W) | Memory without conscious recollection.
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| X) | Piaget's fourth sensorimotor substage, which develops between 8 and 12 months of age.
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| Y) | The ability to produce an endless number of meaningful sentences using a finite set of words and rules.
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| Z) | The focusing of mental resources.
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| AA) | The sound system of a language.
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| AB) | Piaget's fifth sensorimotor substage, which develops between 12 and 18 months of age.
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| AC) | A mechanism proposed by Piaget to explain how children shift from one stage of thought to the next.
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| AD) | The appropriate use of language in different contexts.
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| AE) | An area in the brain's left frontal lobe involved in speech production.
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| AF) | Imitation that occurs after a time delay of hours or days.
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