Abstract: The beginnings of the idea about a book on “side bias” began in the year
1994 during the senior editor"s research association with late Professor M.P.
Bryden and colleagues at the University of Waterloo, Canada. Over many
discussions with Professor Bryden, it was clear that the concept of “side bias”
encompasses all aspects of motor behaviour within the context of human
(and non-human animal) laterality. The tendency to favour one side or limb
over the other is important not only from the perspective of understanding
the functional asymmetries of the cerebral hemispheres, but also to an
understanding of a myriad of aspects of human behaviour, as the
contributions to this volume will attest.
By side bias, most people would think of bias in terms of hand
preference or performance. The phenomenon of side bias, however, is more
general and influences motor behaviour of all kinds, ranging from simple
hand movement to complex behaviours like facial expression and attention.
Therefore, the concept has been operationalized in terms of bias reflected in
the motor expression of paired (such as hands, feet, eyes, or ears) or
nonpaired organs (such as the face) as a function of preference, performance
or attentional/intentional factors. ....
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