# Product Styling Cognition Based on Kansei Engineering Theory and Implicit Measurement
## 3 Materials and Methods
### Product Styling Cognition Experiments Based on Implicit Measurement  
#### 3.4.1 Experiment Preparation and Participant Demographics  
(1) Preliminary Preparation  
In the experiment, two computers were prepared. Computer 1 was a hardware platform for eye-tracking experiments, including experimental design, stimulus presentation, and statistical analysis of eye-tracking data. This computer functioned using a dual monitor setup to display interfaces for both the examiner and the participant separately. Computer 2 was a hardware platform for EEG experiments to capture, process, and analyze EEG data. Before the experiment, the spatial arrangements of the computer, monitor, eye-tracking device, and EEG equipment were adjusted. To improve the precision of measurements, the EEG device was positioned away from industrial electrical sources.  
Informed consent forms, experimental precautions, and lists of the experimental examination items were prepared. Participants were required to complete the informed consent form before the experiment. This process allowed the research team to verify participant details, ensuring that the experiment complied with the guidelines set by the ethical review board and experiment design. The EEG experiment materials included a conductive paste, flat-head syringe, shampoo, towel, and hair dryer. To satisfy the specified electrode impedance, adequate conduction between the electrodes of the EEG device and the surface layer of the scalp was required. The conductive paste and flat-head syringe were employed to achieve the required electrode impedance.  
(2) Experimental equipment  
The experimental equipment used in this study included EEG and eye-tracking equipment. The EEG amplifiers (Brain Amp MR32), EEG signal recording software (Brain Vision Recorder 1.21), and EEG signal analysis software (Brain Vision Analyzer 2.2) were obtained from Brain Products (BP) company, Germany. The EEG system was equipped with 32 EEG channel electrodes. The sampling rate was set to 1000 Hz/channel, and electrode placements adhered to the 10-20 international standard.  
A Tobii Pro X3-120 (Tobii, Sweden) eye-tracking device was used, and the sampling rate was set to 120 Hz. The accuracy was 0.5\({}^{\circ}\), and the spatial resolution was 0.2\({}^{\circ}\). The eye-tracking device was equipped with Tobii Pro Lab 1.194 software for data recording and analysis and Stimulus Presentation Tool 3 for stimulus presentation.  
(3) Stimulus materials  
The stimulus materials included the 60 car research samples collected previously. The experiments required mapping the areas of interest (AOI) on the study samples. The AOI is the primary region of the experimental stimulus relevant to the study. AOIs can be determined based on the study's purpose. In this experiment, the entire car was segmented into AOIs.  
(4) Participant demographics  
A total of 28 university students were recruited (13 males and 15 females, aged 20-26 years). All participants were in good health, had no history of mental illness, and were right-handed; their visual or corrected visual acuity was normal. The participants were familiar with the product form and image vocabulary. They did not consume any stimulants, including sedatives, tranquilizers, alcohol, or coffee, during the 48 h window preceding the experiment. All of them voluntarily participated in the experiment and were rewarded financially at the end of the experiment.