Bruner citation?

Martin Ryder (mryder who-is-at
Mon, 28 Dec 1998 13:58:29 -0700 (MST)

In his keynote address at ISCRAT, Jerome Bruner
made reference to a study which he and his colleagues
at Oxford undertook to investigate whether 'agency' is
a construct that can be attributed to infant subjects.
He described the projection of a kindly mother-like
figure whose focus could be controled by the baby
using a mechanism like a passafier. Babys learned
that they could control the focus of the picture
with deliberate oral sucking actions.

Is anyone here familiar the original study which Bruner
referenced in his talk? A citation of that work would
be greatly appreciated.

Martin R.