Hrdy found that fathers were less able to detect high levels of infant distress, compared with mothers.
These results appear to support the biological explanation that the lack of oestrogen in men means fathers simply aren't able to form close attachments.
This suggests that the father's role is to some extent biologicallydetermined.
Bowlby goes as far to suggest that fathers can fill a role closely resembling that usually filled by a mother - but in most cultures this is uncommon.
The role of the father tends to be different - but he argues this doesn't mean it's any less significant. The father is more likely to engage in physically active and novelplay than the mother and tends to come the child's preferredplaycompanion.
White and Woollet propose that the lack of sensitivity actually plays a positive role in development - fostering problem solving, greater communicative and cognitive demands in children.
Field analysed face-to-face interactions from video footage of infants at 4 months of age. He found that fathers engaged in more game playing and held their infants less.
However, primary caretaker fathers engaged in significantly more smiling, initiative grimaces, and imitativevocalisations than secondary caretaker fathers.
Recent research suggests both parents are equally capable of providing emotional support to the child.
This also has economic implications, as it promotes more flexible working arrangements in the family. This means that modern parents better equipped to maximiseincome and contribute more effectively to economy.