Missing-Stimulus
Potentials Associated With a Disruption of Human-Computer Interaction
H. Nittono |
Cognitive
processing associated with the recognition of computer malfunction
was examined by recording event-related brain potentials time-locked
to voluntary mouse button clicks that did not produce feedback from
the computer. Sixteen university students performed a simple stimulus
discrimination (oddball) task in auditory and visual modalities.
Each button press produced either a target or a standard stimulus,
or no stimulus response in some trials (missing stimulus, p=0.2).
Biphasic missing-stimulus potentials appeared after the stimulus
omission within a latency range of 150 to 550 ms. For both auditory
and visual modalities, the initial negative component was dominant
at the right temporal site, whereas the following positive component
was at the central site. The peak latencies of these potentials were
about 30 ms shorter in the auditory than in the visual modality,
though the eliciting event was identical (i.e., stimulus omission).
Brain potentials after users' operations may provide an objective
and unobtrusive index of users' expectations in human-computer interaction. Key words: event-related potential, action-perception paradigm, self-paced task, action outcome |