CHAPTER V. Native and Acquired Traits 89

NATIVE AND ACQUIRED TRAITS 89

The Source of Native Traits 90

Reactions Appearing at Birth Must Be Native 91

Reactions That Cannot Be Learned Must Be Native 92

Experimental Detection of Native Reactions 93

Is Walking Native or Acquired? 95

Universality as a Criterion of Native Reactions 97

Some Native Traits Are Far from Being Universal 98

Why Acquired Traits Differ from One Individual to Another 99

What Mental Traits Are Native? 100

Exercises 103

References 104