Identifying Big Five Personality Traits through Controller Area Network Bus Data

Wang, Yameng; Zhao, Nan; Liu, Xiaoqian; Karaburun, Sinan; Chen, Mario; Zhu, Tingshao

doi:https://doi.org/10.1155/2020/8866876

Journal of Advanced Transportation

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Abstract Introduction Materials and Methods Results Discussion Conclusions Data Availability Conflicts of Interest Acknowledgments References Copyright Related Articles

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Machine Learning Applications in Transportation Engineering

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Research Article | Open Access

Volume 2020 | Article ID 8866876 | https://doi.org/10.1155/2020/8866876

Identifying Big Five Personality Traits through Controller Area Network Bus Data

Yameng Wang,^1,2Nan Zhao,¹Xiaoqian Liu,¹Sinan Karaburun,³Mario Chen,⁴and Tingshao Zhu¹

Academic Editor: Petr Dolezel

Received18 Aug 2020

Revised30 Sept 2020

Accepted06 Oct 2020

Published20 Oct 2020

Abstract

As adapting vehicles to drivers’ preferences has become an important focus point in the automotive sector, a more convenient, objective, real-time method for identifying drivers’ personality traits is increasingly important. Only recently has increased availability of driving signals obtained via controller area network (CAN) bus provided new perspectives for investigating personality differences. This study proposes a new methodology for identifying drivers’ Big Five personality traits through driving signals, specifically accelerator pedal angle, frontal acceleration, steering wheel angle, lateral acceleration, and speed. Data were collected from 92 participants who were asked to drive a car along a pre-defined 15 km route. Using statistical methods and the discrete Fourier transform, some time-frequency features related to driving were extracted to establish models for identifying participants’ Big Five personality traits. For these five personality trait dimensions, the coefficients of determination of effective predictive models were between 0.19 and 0.74, the root mean squared errors were between 2.47 and 4.23, and the correlations between predicted scores and self-reported questionnaire scores were considered medium to strong (0.56–0.88). The results showed that personality traits can be revealed through driving signals, and time-frequency features extracted from driving signals are effective in characterizing and identifying Big Five personality traits. This approach could be of potential value in the development of in-car integration or driver assistance systems and indicates a possible direction for further research on convenient psychometric methods.

1. Introduction

It has been shown that personality traits can be used to explore individuals’ potential needs in different contexts, such as driving. Several studies have demonstrated that risky driving behaviors are positively associated with neuroticism and extraversion [1–3], but negatively associated with agreeableness, openness, and conscientiousness [1, 4, 5]. Furthermore, Shen et al. [6] found that positive driving behaviors are negatively correlated with neuroticism and positively correlated with openness, conscientiousness, extraversion, and agreeableness. Currently, there is a need for individualization of vehicles in the automotive industry with the aim of improving driving experiences [7]. Thus, it has become an important focal point [8] to adapt the vehicle to drivers’ preferences (e.g., personality).

In the traditional method of measuring personality traits, self-report questionnaires, such as the 44-item Big Five Inventory (BFI-44), are used [9]. Although personality traits are relatively stable individual psychological variables that do not need to be measured frequently over a short period of time [10], relying on self-report questionnaires limits its potential to improve driving experiences in some scenarios. For instance, for nonfixed drivers (e.g., taxis, rental cars, and family cars) filling out a questionnaire before every time they drive not only does not meet a driver’s need for vehicle adaptation but also takes considerable time and concentration, which limits the availability and effectiveness of self-reported personality traits. Therefore, a more convenient, objective, real-time method to identify drivers’ personality traits has become increasingly important.

Sensors and electronic control units (ECUs) have only recently become increasingly common in the automotive industry, because they not only guarantee optimal engine function, but also provide a large amount of almost real-time data about the car, driver, and surrounding environment. Various tools, including sensors, driving simulators, and controller area network (CAN) bus data logger, have been applied to conduct studies and many meaningful conclusions have been achieved. For instance, regarding the results of vehicle acceleration and steering behaviour analysis as indicators of driving safety, Wu et al. [11] attempted to determine the optimum design of pavement marking to reduce the rutting on asphalt pavements. Besides, for safety consideration, driving simulators have been used in studies where field operating tests cannot be carried out, such as the study investigating the safety of trucks under crosswind of tunnel and bridge sections [12]. Moreover, the CAN data have been used for the communication among ECUs mounted to a car [13], the tuning problem of digital proportional-integral-derivative parameters for a DC motor [14], and integrated motor-transmission powertrain systems [15]. Additionally, as one of the five protocols used in OBD-II vehicle standards, CAN technology has become the standard for automotive embedded systems [16]. The increased availability of rich driving data has provided new perspectives for investigating individual behaviors and psychological indicators.

With the advantage of high quality and fine data granularity of driving signals provided by in-vehicle sensors, many studies have been conducted based on these data. It has been demonstrated that driving signals can be used to recognize drunk driving behaviors [17], identify drivers [18], and detect anomalous driving [19]. Additionally, the capability of recording real-time driving information is soon used in other applications with the help of machine learning technology [20]. Furthermore, Wan et al. [21] attempted to detect anger states while driving based on multiple sensor signals using a least square support vector machine model (82.20% accuracy rate).

In summary, although there has been evidence that driving signals can reveal personality traits, the method of identifying personality traits based on driving signals has not been established in previous studies. It motivates our efforts to intensively explore the possibility of a solution for real-time identification of personality traits through driving signals. In this work, we aimed to construct feature sets from raw driving signals provided by in-vehicle sensors using CAN bus and identify Big Five personality traits based on these features using a machine learning approach.

2. Materials and Methods

In this section, a methodology with the aim of identifying personality traits through CAN bus data is proposed. Using statistical methods and the discrete Fourier transform, the features related to personality traits are extracted from raw driving signals provided by in-vehicle sensors using CAN bus in the time and frequency domains, respectively. These features will be then used to identify Big Five personality traits automatically by the linear regression, support vector regression, etc. In the study, a four-step procedure was conducted: (1) Data collection, (2) Data preprocessing, (3) Feature extraction and selection, and (4) Model training, as shown in Figure 1.

2.1. Data Collection

2.1.1. Experimental Settings

A BMW i3 test vehicle was equipped with a data logger to record the signals on the CAN bus at the sampling frequency of 10 data points per second for this study. We collected data from 92 participants (52 males and 40 females) who were recruited using convenience sampling from BMW China. All of the participants were asked to drive the BMW i3 test vehicle on a pre-defined route as shown in Figure 2. The pre-defined car route was 15 km and included traffic lights stop signs, surface streets etc. With this user consistent driving task, we wanted to eliminate interference information, so as to explore deeper insights between driving behavior and personality traits. To facilitate data analysis, we divided the route into different sub-routes according to road conditions, and an instructor sitting in the copilot recorded the time that the car passed through different sub-routes during the experiment.

Once the procedure of driving signals collection was done, each participant was required to complete the BFI-44 to measure their Big Five personality traits. The questionnaire consists 44 items and five subscales: openness (10 items); conscientiousness (9 items); extraversion (8 items); agreeableness (9 items); and neuroticism (8 items). Each item of BFI-44 is assessed on a Likert 5-point scale, ranging from 1 (“disagree strongly”) to 5 (“agree strongly”). In this study, the Chinese version of the questionnaire was implemented. Its validity and reliability has been proved [22].

2.1.2. Signals Selection

Among the signals transmitted on the CAN bus, the analyses of this study focused on five signals recorded at the sampling frequency of 10 data points per second: accelerator pedal angle, frontal acceleration, steering wheel angle, lateral acceleration, and speed. Compared with other signals, these signals are not only more stable and easy to obtain on different types or models of vehicles, but also can reflect drivers’ driving behavior from different aspects. For instance, accelerator pedal and steering wheel signals are the direct output of drivers that directly reflect the interaction between the driver and the vehicle [23]; speed and accelerations are measures of drivers’ driving style [24] that can reflect drivers’ specific driving preferences and habits, e.g., harsh accelerations or speeding. An example of these signals is shown in Figure 3.

2.2. Data Preprocessing

Raw driving signals with noisy and redundant information may bring more redundancy and complexity for models training and affect the performance of recognition models. Therefore, we need to preprocess the raw driving signals, which includes two steps: (1) data segmentation and (2) low-pass filtering.

2.2.1. Data Segmentation

Since driving under the same road conditions can be regarded as repetitive behaviors, large amounts of repetitive data may lead to low computational efficiency and data redundancy. In addition, it is difficult to guarantee the consistency of road conditions such as corners or curved roads in the actual driving environment. Then recognition models trained based on data obtained under such road conditions may have a poor generalization ability in practice. In this work, we analyzed driving signals of a straight sub-route from point A to point B (as shown in Figure 1). On average, participants took 26.03 minutes (SD = 7.48) to complete the course. For the consistency of driving data, we used driving signals for the first 9600 data points (16 minutes).

2.2.2. Low-Pass Filtering

As unexpected jolts or vibrations might cause some noise or high-frequency components in data collection, we should do the job of filtering on the raw driving signals as the signal processing. Gaussian filter is a low-pass filter, attenuating noises and high-frequency components in signal data [25]. We computed the convolution of each driving signal and the Gaussian filter, whose window length is 5, and whose coefficients are . The procedure of filtering is defined aswhere is the driving signal, stands for convolution, and denotes the Gaussian filter. We take a fragment of the frontal acceleration as an example. After low-pass filtering, the filtered data (See Figure 4(b)) are smoother compared to the raw data (See Figure 4(a)). And many little fluctuations and burrs shown in the red circle in Figure 4(a) are removed.

(a)

(b)

2.3. Feature Extraction and Selection

After data preprocessing, we then need to extract and select features from driving signals that can effectively characterize the Big Five personality traits. Specifically, using the time-frequency analysis method, we first extracted features in the time and frequency domains, respectively. And then we find and remove redundant information from these features by dimensionality reduction and feature selection.

2.3.1. Temporal Domain Features Extraction

Temporal domain information related to the statistical value of driving signals (e.g., mean value, median value, and standard deviation value) was used to characterize drivers’ behavior patterns. Since the global statistical value of signals cannot reflect the details of driving behavior, this information was integrated into a given sliding temporal window. Specifically, in a temporal window of width , we defined the set of data and the following features:(1)Moving median: the median value of the set.(2)Moving mean: the mean value of the set(3)Moving standard deviation: the standard deviation value of the set.

To exam linear dependence of a signal, we estimated autocorrelation and partial autocorrelation of different lags. Specifically, autocorrelation is the correlation of a signal with a delayed copy of itself [26], which is defined aswhere refers to the length of the signal, refers to mean of the signal, and refers to the lag. Partial autocorrelation gives the partial correlation of a stationary time series with its own lagged values [26], which is defined aswhere refers to the covariance and refers to the variance and refers to the lag.

For each signal, we obtained 45 statistical values through a temporal window of 2 minutes with an overlap ratio of 50%. By setting different delays from 2 seconds to 20 seconds in steps of 2 seconds , we extracted 20 linear dependence features. Finally, we obtained a total of (45 + 20) ∗ 5 = 325 time domain features.

2.3.2. Frequency Domain Features Extraction

In addition to temporal domain features extracted using statistical methods, we conducted. The discrete Fourier transform to convert data from temporal domain to frequency domain [27]. The formula is defined aswhere refers to the length of the signal, is the sign of complex number.

For each signal, we chose the first 100 amplitudes and phases, respectively. Finally, we obtained a total of (100 + 100) ∗ 5 = 1000 frequency domain features.

2.3.3. Dimensionality Reduction

It must be emphasized that driving signals may be interrelated. For instance, the average Pearson correlation coefficient between different signals is shown in Figure 5. Therefore, some of the 325 + 1000 = 1325 features may be closely related. This redundant information may impact the performance of recognition models, so we need to reduce the redundancy of the feature set.

Since the values of different signals were measured on different scales, in case some important features extracted from signals with small values might be ignored, all features were firstly processed by Z-score normalization. Principal Component Analysis (PCA) was then utilized to reduce the feature dimensions, as it has been demonstrated that PCA could perform much better than other techniques on training sets with small size [28]. To make reconstruction error less than 5%, we reserved 77 principal components as features after dimensionality reduction.

2.3.4. Feature Selection

To get the optimal performance of recognition models, we should find and remove useless features from the above 77 features. In this study, we used the sequential backward selection (SBS) to find the best subset of features that reduced the feature dimension while minimizing the performance loss of recognition model [29], and Algorithm 1 describes the whole process. SBS is a greedy search algorithm that starts from the whole feature set and sequentially discards the feature so as to improve (or minimally worsens) the evaluation measure . And it stops when the evaluation measure is not increased or the subset is an empty set, which means that all remaining features are useful for the recognition model.

	Input:
	: The whole feature set
	: Evaluation measure.
	Output:
	: The best subset of features.
	,
	repeat
	,
	,
	until not improvement in OR

2.4. Model Training

We trained regression models for the recognition of Big Five personality traits. Since there is no evidence showing that a certain machine learning algorithm is the most suitable for identifying personality traits, we investigated the state-of-the-art regression models in this study: linear regression (LR) [30], support vector regression (SVR) [31], and Gaussian process regression (GPR) [32].

LR is a parameter model, whose parameters are estimated by minimizing the mean square error, and makes predictions requires simple matrix multiplication [30]. SVR is an extension of support vector classification, which first maps feature vectors to a higher-dimensional feature space using kernel trick and then makes predictions based only on support vectors [31]. In contrast to the above described algorithms, GPR is a nonparametric kernel-based probabilistic model, with the advantage of automatic tuning of the kernel parameters from the training data by maximizing log marginal likelihood [32].

In this study, we took the linear kernel function for SVR, and the kernel function of the dot-product kernel plus the white kernel for GPR. To evaluate the predictive performance of the models, we considered the root mean squared error , the coefficient of determination , and the Pearson correlation coefficient between predicted scores and self-reported scores of the respective personality traits. Denote , as a regression function and its corresponding parameters set and as the th sample’s feature set. The , and can be written as outputs the predicted score from features and refers the true score of the th sample. In this work, we applied 10-fold cross validation and averaged performance measures across all folds within a single prediction model.

3. Results

3.1. Demographics and Questionnaire Scores of BFI-44

Of these 92 participants (52 males and 40 females), their ages ranged from 21 to 56 years (mean = 31.84, SD = 7.03), and their driving experience ranged from 0.5 to 33 years (mean = 7.84, SD = 5.96). In terms of education level, the participants reported having the following levels: below university diploma, 2.17% (n = 2); university diploma, 51.09% (n = 47); and above university diploma, 46.74% (n = 43). Descriptive statistics of self-reported personality traits are provided in Table 1. Of the 92 participants who formed the study sample, the personality traits scores between two genders showed no significant difference (openness: t = 0.62, p = 0.53; conscientiousness: t = 1.14, p = 0.26; extraversion: t = −1.16, p = 0.25; agreeableness: t = −0.08, p = 0.45; neuroticism: t = -1.38, p = 0.17), which means that gender was not a factor which affects the performance of the Big Five personality traits recognition models in our date set.

3.2. The Recognition of Big Five Personality Traits

After feature selection, the remaining features were different according to regression algorithms. The number of remaining features for LR, SVR, and GPR was shown in Table 2.

The performance of the regression models is presented in Figure 6 and Table 3. The results showed that personality traits can be revealed through driving signals. Specifically, for the five dimensions of personality traits, the best performance occurred with SVR predicting openness (, , ), followed by SVR predicting conscientiousness (, , ), SVR predicting extraversion (=3.33, = 0.45, = 0.75), SVR predicting agreeableness (, , ), and LR predicting neuroticism (, , ). Furthermore, our results indicated that the performances of different models varied. The results showed that the average performance of the SVR model is better than the LR model and GPR model.

4. Discussion

We collected driving signals provided by in-vehicle sensors using CAN bus and trained machine learning models for identifying an individual’s Big Five personality traits. Using the time-frequency analysis method, we extracted features from driving signals in the time and frequency domains, respectively, which were used to build personality traits recognition models. For the five personality trait dimensions, the coefficients of determination of the different models were between 0.19 and 0.74, the root mean squared errors were between 2.47 and 4.23, and the correlations between self-reported questionnaire scores and predicted scores were considered medium to strong (0.56–0.88). Our findings demonstrated that driving signals can be used to automatically identify individual personality traits in real-time.

Our results shown the driving signals are a convenient and objective source for measuring individual personality traits. As can be seen from our work, participants only need to drive for less than 10 km before their personality traits can be identified quite precisely. These results were consistent with previous studies showing an association between personality traits and driving behavior [2, 4, 6]. It is worth noting that the effective machine learning models in this current study were built based on low-level features in the time and frequency domains. The high-level features of driving behaviors in this field (e.g., lane switching, tailgating, overtaking, and speeding) are often based on subjective qualitative evaluations [33, 34], which limits the effectiveness of integrating these features into one machine learning model in practice. Although, time-frequency features may not provide much intuitive understanding of individual driving behaviors, they could provide more comprehensive information about driver’s personality reflected in driving. Our results demonstrated the validity of building machine learning models to identify self-reported personality traits based on low-level features extracted using the time-frequency analysis.

Modern cars have recently become equipped with several hundred sensors and ECUs, which means we can easily obtain driving signals at minimal cost. Thus, this method to identify personality traits based on driving signals is suitable for the development in-car integration and single-chip embedded systems. Additionally, personalization in the automobile sector is a relatively recent trend to ensure optimal user experience in recent years [35]. Although personalization can be explicitly implemented by providing drivers with system parameters that can be manual tune, the implicit mode that estimates drivers preferences based on observing their behavior not only reduces the tedious and error-prone task of manual tuning, but also satisfies drivers’ need for vehicle adaptation through fine-tuning [36]. For example, the “Intelligent Personal Assistant” (IPA) in vehicles is an important feature which offers a way for drivers to interact with their vehicles using their voice [37]. Identifying driver’s personality traits by driving behavior and personalizing the IPA dynamically to the current driver will increase the customer experience. Therefore, this method may have potential value of the development of human-centered intelligent driving environments.

As a pilot study, it is appropriate to highlight several limitations. First, in this study personality traits were measured using self-report questionnaires. Although the validity of the questionnaires in accessing personality traits has been well supported in the literature [22], more criteria could be included in future studies. Second, this study’s sample population comprised white-collar workers and was not sufficiently large. Therefore, the validity of our model in identifying self-reported personality traits cannot be equated with the effectiveness in populations of individuals with different occupations, education levels, and cultures. Third, the current study built recognition models based on low-level features extracted using the time-frequency analysis, which cannot provide a clear understanding for the relationship between driving behavior and personality. Further research based on intuitively visible high-level features is necessary. Fourth, although our results showed the validity of identifying personality traits using this model, why the performance of models of personality traits in different dimensions is varied remains unclear. The disparity of the accuracies in identifying different dimensions implied that not all the personality-relevant could be equally reflected in driving. For a better understanding of how driving behavior reflects individual personality traits, more future works need to continue from two aspects: first, conducting more experiments, such as driving simulator experiments using fMRI technology [38]; second, explore the relationship between driving behavior and personality traits using more in-depth analysis, such as factor analysis.

Despite those limitations due to the exploratory nature of the study, it suggests the potential in future research on data-driven psychological measurement. Driving signals have the advantages of being real-time, continuous, nonintrusive, and reliable [39], while requiring him/her finishing a questionnaire frequently and repeatedly is often not acceptable in practice; therefore, this method can measure personality traits in real-time and objectively, which cannot be achieved by a questionnaire. So our recognition model may show advantages in some cases, such as the driver is nonfixed but has a high demand for vehicle adaptation. Moreover, future research can transfer this method to the recognition of other psychological indicators in driving environment, because this method can monitor the continuous change of driver’s psychological indicators. Additionally, although technological progress enables increasing automation in vehicles, the current general assumption for designing driving systems, such as driving assistance systems, is that drivers prefer to use systems that adopt a similar driving style to their own [8]. However, there is little empirical evidence to support this assumption. Thus, this method provides a new direction for the research on designing driving assistance systems.

5. Conclusions

This study moved one step forward toward a low-cost, nonintrusive solution for real-time identification of Big Five personality traits, which could be of potential value in the development of in-car integration. Our experiment demonstrated that driving signals provided by in-vehicle sensors using CAN bus can be an objective data source for measuring personality traits, and the predictive machine learning models showed effectiveness in identifying self-reported personality traits. Furthermore, this pilot study indicated a possible direction for further investigation on convenient psychometric methods and provided new perspectives for the development of intelligent driving environments from a human-centered perspective.

Data Availability

The data used to support the findings of this study are available from the corresponding author upon request.

Conflicts of Interest

The authors declare that there are no conflicts of interest regarding the publication of this paper.

Acknowledgments

This work was supported by the BMW China Research Project (grant no. 20170321), National Natural Science Foundation of China (grant no. 31700984), and Youth Innovation Promotion Association CAS.

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Copyright

Copyright © 2020 Yameng Wang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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