之反應，其所呈現的結果是有落差的，尤其在認知初期階段。 Hazard label is most important for safety and health management.
Whether hazard label is easy to recognize or not concerns with accurate
decision making as emergency condition. The recognizability criterion of
symbol of label is predominantly acquired from questionnaire. Owing to
lack of objective measured data, the reliability of subjective experiment
from questionnaire has always been challenged. Therefore, to acquire
objective measured data by using physiological measuring instrument is
available for compensating the lack of objective measuring.
Electroencephalogram (EEG) has high temporal and spatial resolution
and is the best choice for physiological measuring. The purpose of this
study is to explore the recognition on various hazard symbols identified
during different perplexity. Six hazard labels were used as target images.
The target image appeared from computer monitor lasted 1 second and
then disappeared for 1 second to make a trial. The target image repeated
the process mentioned above for 100 trials and acquired the ERP by
averaging technique. The experiment aimed to evaluate the recognition
on hazard labels by using event-related potential (ERP).
The study found there is a gap between objective (ERP) and subjective
measurements (questionnaire), especially in early recognition stage. The
subjective measurement by questionnaire is partial to psychological level
related with acquired learning, while the objective measurement using
EEG is partial to physiological level.