"bidirectional relations" is correct and usable in written English.
It is a way to describe a mutual, reciprocal relationship between two things. For example, "The two countries had strong bidirectional relations, with both exchanging goods and services."
These bidirectional relations did not vary across child gender and proved robust to the inclusion of potential common factors.
Therefore, the present longitudinal study explored the bidirectional relations between executive functions and reading comprehension during primary school across a 1-year period.
The potential processes underlying the observed bidirectional relations are discussed with respect to developmental changes in reading comprehension across the primary years.
The findings highlight the importance of examining both home-based and school-based involvement over time during the transition to primary school and the bidirectional relations between maternal involvement and children's school adjustment.
The changes in maternal involvement during the transition to primary school and the bidirectional relations between maternal involvement and school adjustment were explored in this study using a two-wave longitudinal design with a 8-month interval.
The logical-semantic relations are the synonymy (in the case of elements that are equal); antynomy (opposite, but not bidirectional relations); hyponymy/hypernymy (IS-A hierarchy), mereonomy (which corresponds to the "is part of" relation and defines the cases in which we find the correspondence: components/member/particle).
But my memory also has a bidirectional relation with my self-conception.
Thus, emotions/emotional states constitute a bidirectional relation between the two modalities.
Studies on temporal relation of exacerbation of headache to emotional features are also required to delineate the bidirectional relation between pain and emotion.
A complex bidirectional relation exists between migraine and stroke, and new evidences show a clear association between migraine and coronary heart disease.
Particularly, a complex and bidirectional relation between migraine and stroke has been described, including migraine as a risk factor for cerebral ischemia, migraine caused by cerebral ischemia, migraine mimicking cerebral ischemia, migraine and cerebral ischemia sharing a common cause, and migraine associated with subclinical vascular brain lesions [2].
