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At what age can multiple talker babies discriminate consonant sounds? (Jusczyk, 1992)

Jusczyk, 1992 found what in infants, when they were able to distinguish words from the same talker?

Juscyzk (1995) found that infants can do what, evidence that they do not just here a continuous stream in fluent speech?

At what age did Stager and Werker (1997) find that the ability to discriminate speech sounds decline?

Piaget (1962) suggests that language and what are markers the ability to manipulate symbols?