Kisilevksy et al. (2003) showed that fetuses one to two weeks before birth recognized their mother's voice.This was accomplished by training the infant in a conjugate reinforcement task.

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Kisilevsky et al. (2003) demonstrated that fetuses could recognize their mother's voice, but the study did not involve training the infant in a conjugate reinforcement task. Instead, it measured changes in fetal heart rate in response to the mother's voice compared to a stranger's voice.

Kisilevksy Et Al