Research on speech perception has determined that infants Oare more sensitive to native language sounds and less sensitive to nonnative sounds by 11 to 12 months of age. become more sensitive to differences in consonant sounds and less sensitive to differences in vowel sounds at 7 months of age. O are first able to discriminate between similar consonant sounds in their native language at 4 to 6 months of age. O are first able to recognize the vowel sounds of their native languages between 2 and 3 months of age. Question 24 2 pts Research on infants' depth perception using the visual cliff found that Omost infants of crawling age (7 months of age) clearly perceive depth and avoid drop-offs. O infants who learn that crawling over drop-offs is risky are able to transfer that lesson to risky situations when they begin walking O the heart rate of 2-month-old infants speeded up when placed on the deep side, indicating a fear response. O most crawling infants (7 months of age) would cross both the shallow and the deep sides to get to their mothers