J. Faubert et M. Vongrunau, THE INFLUENCE OF 2 SPATIALLY DISTINCT PRIMERS AND ATTRIBUTE PRIMING ON MOTION INDUCTION, Vision research, 35(22), 1995, pp. 3119-3130
In a series of experiments, we demonstrate the effects of two spatiall
y distinct primers on motion induction (ME) and the influence of attri
bute characteristics on the resulting collision site, MI means that a
primer such as a spot produces a motion sensation in a subsequently pr
esented geometrical pattern such as a line or a rectangle, This patter
n will appear to grow out of the spot, In the present paper we report
that when two different locations of the visual field are activated si
multaneously by presenting two spots prior to a bar between these Spot
s, there is a motion sensation of two bars growing away from the spots
and colliding in the centre (split priming effect). Attribute charact
eristics can have profound effects on this illusion, When two differen
tly coloured isoluminant spots are presented and the subsequent bar is
composed of either one of these colours, the induced motion is away f
rom the spot of identical colour, We call this effect attribute primin
g, Manipulating the delay between the spot presentations (SOA) showed
that timing had a strong effect on split priming, but very Little on a
ttribute priming, For split priming experiments with dichoptic present
ations, we show that at shorter SOAs there is a dominant effect of the
primer which is presented to the same eye as the bar, as opposed to t
he usual dominance of the later primer. For longer SOAs, however, the
temporal sequence of the primers also plays a role in motion induction
, Further, we report that geometrical arrangements can strongly influe
nce the direction of perceived motion when more than a single primer i
s used, Generally, in motion induction with two primers, unlike what i
s found with a single primer, there appears to be a dominance of low-l
evel effects such as geometry, attributes, and eye of presentation, Fo
r dichoptic presentations, however, this can be overcome for longer SO
As, The differences between the single and split priming paradigms are
discussed in terms of the differential contribution of bottom-up and
top-down processes.