10.5061/DRYAD.217CC62
Curran, William
Queen's University Belfast
Beattie, Lee
Queen's University Belfast
Bilello, Delfina
Queen's University Belfast
Coulter, Laura A.
Queen's University Belfast
Currie, Jade A.
Queen's University Belfast
Pimentel Leon, Jessica M.
Queen's University Belfast
Data from: The direction aftereffect is a global motion phenomenon
Dryad
dataset
2019
Direction aftereffect
Motion processing
visual perception
2019-02-27T05:01:53Z
2019-02-27T05:01:53Z
en
https://doi.org/10.1098/rsos.190114
227045 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Prior experience influences visual perception. For example, extended
viewing of a moving stimulus results in the misperception of a subsequent
stimulus’s motion direction – the direction aftereffect (DAE). There has
been an on-going debate regarding the locus of the neural mechanisms
underlying the DAE. We know the mechanisms are cortical, but there is
uncertainty about where in the visual cortex they are located – at
relatively early local motion processing stages, or at later global motion
stages. We used a unikinetic plaid as an adapting stimulus, then measured
the DAE experienced with a drifting random dot test stimulus. A unikinetic
plaid comprises a static grating superimposed on a drifting grating of a
different orientation. Observers cannot see the true motion direction of
the moving component; instead they see pattern motion running parallel to
the static component. The pattern motion of unikinetic plaids is encoded
at the global processing level – specifically, in areas MT and MST – and
the local motion component is encoded earlier. We measured the direction
aftereffect as a function of the plaid’s local and pattern motion
directions. The DAE was induced by the plaid’s pattern motion, but not by
its component motion. This points to the neural mechanisms underlying the
DAE being located at the global motion processing level, and no earlier
than area MT.
Data fileRaw data filesData.zip