| |
Abstract:
Abstract: According to the asynchronous discrete model
partial information cannot be transmitted from perceptual to
motoric processing stages if stimuli contain only one separable
code. This is in contrast to continuous models which assume that
early communication can always take place. In a recent experiment
we obtained evidence from the lateralized readiness potential (LRP)
for partial information transmission from unidimensional stimuli in
a condition where response speed was emphasised. Here we report a
replication and extension of this experiment. A two-choice Go/NoGo
task with one-dimensional stimuli (4 squares of different size) was
employed where hand- (left/right) and go/no-go-decisions were
determined by easy and hard level spacings of the squares,
respectively, while speed and accuracy conditions were used as
within factors. In both conditions significant NoGo LRPs indicated
partial information transmission of the easy spacing level
information to the motor stage. However, the NoGo LRP under the
accuracy condition was restricted to the subgroup which had
performed the speed condition first, indicating a cross-over
effect. A re-analysis of the first experiment, splitting the
session under the accuracy condition in a first and second part,
showed that also here partial information transmission had occurred
after a certain amount of practice. We conclude that for
one-dimensional stimuli information transmission is initially
discrete, however, with practice, there is an increasing tendency
towards partial transmission of information. Time pressure appears
to facilitate this tendency.
|
