Excuse my non scientific review:
The Studies I'm referring: The Visual Cliff Eleanor Gibson (Richard Walker) original designer....test depth perception as innate of learned.
Then James Source (?) took it further
Rely on mother's emotions to decide what is safe and what is dangerous...trust.
Baby is hard-wired to use mother's expressions, tones etc. as the load-star for navigating life....study shows it begins before birth.
(elephants are better wired to raise their young than humans)
Katy Young and Christine Parsons babies cry can be heard within 100 milliseconds by mother in primitive part of brain....whining pitch is effective, too as studied by Rosemary sokul Chang (sp?) and Nicholas s. thompson
Secure attachment studied by John B and expanded by Mary Ainsworth
Insecurely attached: Avoidantly, Ambivalently and Disorganized (Studied by Mary Mane-disorganized from physical abuse n extreme trauma)
Most recently neuroscience brain development studies confirm brain development is function of programming and of environmental influence with most important given to mother attachment