The Atypical Effective Connectivity of Right Temporoparietal Junction in Autism Spectrum Disorder: A Multi-Site Study

Abstract

Social function impairment is the core deficit of autism spectrum disorder (ASD). Although many studies have investigated ASD through a variety of neuroimaging tools, its brain mechanism of social function remains unclear due to its complex and heterogeneous symptoms. The present study aimed to use resting-state functional magnetic imaging data to explore effective connectivity between the right temporoparietal junction (RTPJ), one of the key brain regions associated with social impairment of individuals with ASD, and the whole brain to further deepen our understanding of the neuropathological mechanism of ASD. This study involved 1,454 participants from 23 sites from the Autism Brain Imaging Data Exchange (ABIDE) public dataset, which included 618 individuals with ASD and 836 with typical development (TD). First, a voxel-wise Granger causality analysis (GCA) was conducted with the RTPJ selected as the region of interest (ROI) to investigate the differences in effective connectivity between the ASD and TD groups in every site. Next, to obtain further accurate and representative results, an image-based meta-analysis was implemented to further analyze the GCA results of each site. Our results demonstrated abnormal causal connectivity between the RTPJ and the widely distributed brain regions and that the connectivity has been associated with social impairment in individuals with ASD. The current study could help to further elucidate the pathological mechanisms of ASD and provides a new perspective for future research.

Introduction

Autism spectrum disorder (ASD) is a neurodevelopmental disorder with impaired social function as its core deficit (Lord et al., 2018), and the global prevalence is estimated to be 1–1.5% (Baxter et al., 2015). Social impairment can affect access to higher education, employment, independent living, and intimate relationships (Poon and Sidhu, 2017) and lead to a lower overall quality of life for individuals with ASD (Howlin and Magiati, 2017). However, the limited understanding of the pathological mechanism leads to the limited therapeutic effect of ASD (Sharma et al., 2018; Xu et al., 2019; Wood et al., 2020; Hickman et al., 2022; Lord et al., 2022). Researchers have utilized advanced brain imaging techniques and analytic methods to elucidate the biological underpinnings of ASD to facilitate early screening and treatment options for individuals with ASD to improve their quality of life (Wang et al., 2022; Zhao et al., 2022).

Previous studies demonstrated that the right temporoparietal junction (RTPJ) not only played an important role in the “social brain” of ASD (Pelphrey et al., 2011; Müeller and Fishman, 2018) but is also involved in higher-order social cognition such as processing the intentions and opinions of others (Wang et al., 2020b), reciprocating face-to-face social interactions (Tang et al., 2016), processing social faces (Kret et al., 2011), and reciprocating interpersonal empathy (Patel et al., 2019; Canigueral et al., 2021). However, the RTPJ cannot perform these social functions alone and needs to cooperate with other brain regions. Examination of the correlation of intrinsic brain activity between the RTPJ and other brain regions can help us to further explore the role played by the RTPJ in the pathophysiological mechanisms of ASD. The resting-state functional connectivity (rs-FC), a commonly used analytic method to provide information on intrinsic synchronized activity in the brain (Fishman et al., 2018; Gotts et al., 2019), demonstrated that the RTPJ had hyperconnectivity with the fusiform gyrus, which is associated with social difficulty in ASD (Chien et al., 2015). Hoffmann et al. conducted a study on self-other distinction and found that the functional connectivity between the RTPJ and the prefrontal cortex (PFC) was reduced in individuals with ASD (Hoffmann et al., 2016). Although previous studies demonstrated that social impairment in individuals with ASD was associated with altered FC in the RTPJ, it is difficult to characterize causal influences between regions and within circuits using only this method (Wicker et al., 2008; Wang et al., 2022). In contrast, effective connectivity can reflect the influence exerted by one neuron system on another in a particular direction and provide information closely related to the causal processes that operate in brain function (Friston, 1994; Wei et al., 2020). Specifically, by comparing the effective connectivity differences between the ASD group and the typical development (TD) group, it could provide information about how impaired brain regions affected other brain regions in ASD (Rolls et al., 2020). This could help researchers better understand the pathophysiological mechanisms of ASD.

Granger causality analysis (GCA) is an exploratory data-driven approach (Wang et al., 2022), which can be used to measure the direction of information flow between brain regions and estimate resting-state directional brain networks (Goebel et al., 2003; Roebroeck et al., 2005; Uddin et al., 2011). Previous studies demonstrated the important role of GCA in exploring the underlying pathological mechanisms of social impairment in individuals with ASD (Chen et al., 2016; Li et al., 2021), which were used to investigate abnormal excitatory or inhibitory directional connectivity between brain regions in individuals with ASD and could identify their underlying social impairment (Liao et al., 2011; Uddin et al., 2011). However, previous GCA studies focused on the study of neural circuits during specific social tasks in ASD, and the mechanisms of spontaneous neural activity interactions between brain regions in the absence of an explicit task need to be further explored (Li et al., 2021). Furthermore, the blood oxygen level-dependent (BOLD) signal measured by resting-state functional MRI (rs-fMRI) is convoluted by underlying neural activity and hemodynamic response function (HRF). Considering that HRF varies in different brain regions due to many neural and non-neural factors (Handwerker et al., 2012; Badillo et al., 2013), the assumption that HRF is homogeneous in the brain may subject the interpretation of results to HRF confounding effects (Rangaprakash et al., 2018). Therefore, we used a blind deconvolution technique to extract the region-specific HRF and deconvolve the BOLD signal into a neural signal (Wu et al., 2013, 2021), which could minimize the confound of non-neural HRF inherent in the BOLD signal (Wu and Marinazzo, 2016).

Previous rs-fMRI studies on ASD commonly used a small sample of participants from a single site, which led to limited statistical power (Van Horn and Toga, 2009). Nowadays, multisite data are used to improve the statistical power by increasing the total sample size of the study (Button et al., 2013; Yu et al., 2018). Besides, multisite data could enroll more representative samples which benefit from generalizing the study results to a diverse population (McGonigle, 2012; Dansereau et al., 2017). Therefore, we conducted our research based on the Autism Brain Imaging Data Exchange (ABIDE), a large sample of a multisite public dataset (http://fcon_1000.projects.nitrc.org/indi/abide/), to improve the reproducibility and statistical power of the results. It includes two large-scale collections: ABIDE I and ABIDE II, each of which is composed of independent functional and structural brain imaging data collected from more than 24 different laboratories worldwide (Di Martino et al., 2014, 2017). Although the large sample of multisite dataset addresses the impact of a small sample on research, there are significant challenges that remain in the analysis of multisite data, since fMRI data from different sites may contain scanner and site variability, which may lead to inconsistent results and low reliability (Friedman et al., 2008; Abraham et al., 2017). To solve this problem, we used anisotropic effect-size signed differential mapping (AES-SDM) to conduct an image-based meta-analysis using the uncorrected statistical parametric map (Radua et al., 2012, 2014), which is a powerful method that can solve the issues caused by heterogeneity among different sites and is useful for distinguishing spurious results from replicable findings (Fox et al., 2014; Müller et al., 2018).

To address the above questions, we first conducted GCA using RTPJ as the region of interest to investigate the differences in effective connectivity between individuals with ASD and TD. Then, an image-based meta-analysis was applied to identify the consistent brain regions that showed a significant difference between the two groups. We hypothesized that individuals with ASD had atypical effective connectivity between the RTPJ and brain regions related to a social function, such as the fusiform and PFC. We hope that the present study could help us further explore the brain mechanisms of social impairment in individuals with ASD and would help to develop the treatment in the future.

Methods

Participants

The experimental data of this study were obtained from the ABIDE dataset (ABIDE I and ABIDE II), which included multiple neuroimaging data sites. Before data collection, all sites were required to confirm that their local institutional review board (IRB) or ethics committee approved both the initial collection and retrospective sharing of a fully anonymized version of the datasets (Di Martino et al., 2014, 2017). A total of 23 sites were included in this study. These sites were further divided into 30 groups according to the number of slices and time points. The participants were divided into the ASD and TD groups, which contained 618 and 836 participants, respectively. The inclusion criteria included (1) participants with corresponding T1 image; (2) participants with lower head movement (translation or rotation <3 mm or 3°); (3) images with good normalization effect [we provided the normalization pictures in the website (http://restfmri.net/ABIDE-RTPJ-FC.zip)]; and (4) participants with right-handedness. The demographic information is shown in Table 1, and detailed information on the inclusion criteria is provided in the Supplementary Table S1. The scan information, diagnostic tools, and ethics statement of all the participants can be found at http://fcon_1000.projects.nitrc.org/indi/abide/.

Resting-State fMRI Data Preprocessing

Resting-State fMRI Data Analysis Toolkit plus (RESTplus V1.24, http://restfmri.net/forum/restplus; Jia et al., 2019), based on Statistical Parametric Mapping (SPM12, http://www.fil.ion.ucl.ac.uk/spm), was used to preprocess the data on MATLAB 2017b (https://www.mathworks.cn/products/matlab.html). The first 10 time points were removed to promote equilibrium magnetization and allow the participants to adapt to the MRI environment. Subsequently, slice-timing was used to correct the acquisition time of differences between slices, and realignment was performed to adjust the time series of images to make every image at the same position (Yan and Zang, 2010). Next, the realigned images were spatially normalized to the Montreal Neurological Institute (MNI) space using the new segment method and resampled to 3 × 3 × 3 mm³ for the intersubject comparison to be feasible. Then, we used a 6 mm full-width half-maximum (FWHM) isotropic Gaussian kernel to perform spatial smoothing to reduce spatial noise (Wei et al., 2015; Shi et al., 2019; Dong et al., 2020; de la Cruz et al., 2021). Moreover, we regressed Friston 24 head motion parameters and signals of white matter and cerebrospinal fluid as nuisance signals to further reduce the effects of head motion (Friston et al., 1996) and non-neuronal BOLD fluctuations (Fox et al., 2005). Finally, the functional images were detrended to reduce systematic increase or decrease in the signal with time caused by long-term physiological shifts, movement-related noise remaining after realignment, or instrumental instability (Turner, 1997; Lowe and Russell, 1999). We did not perform band-pass filtering because previous studies considered that the model order in GCA was low (Hamilton et al., 2011; Liao et al., 2011; Wu et al., 2013).

Blind Deconvolution Procedure

To minimize confounding effects introduced by the hemodynamic response function (HRF), we used Resting-State Hemodynamic Response Function Retrieval and Deconvolution (RS-HRF, https://www.nitrc.org/projects/rshrf) to extract the region-specific HRF and deconvolve the observed BOLD signal into the real neural signal (Wu et al., 2013, 2021).

Granger Causality Analysis

After preprocessing, we used a voxel-wise GCA with the RTPJ as the region of interest to study the effective connectivity of brain regions using RESTplus. The MNI coordinates of RTPJ were centered at x = 54, y = −52, and z = 26, with a radius of 10 mm (Krall et al., 2015), and its time series was defined as seed time series X, while time series Y represented the time series of all the other voxels in the whole brain. In the GCA, if the future value of X or Y generated from the joint prediction of past values of the time series X and Y was better than that of the single prediction of X or Y, it was considered that there was a granger causality between X to Y or Y to X (Granger, 1969). F_{x → y} represented the ability to send information from the seed ROI to the whole brain and F_{y → x} represented the ability of the seed ROI to receive information from the whole brain. Next, we converted the coefficient-based F-to-Z score, namely, Z_{x → y} and Z_{y → x} (Zang et al., 2012).

Statistical Analysis

For demographic and behavioral data, the statistical analyses were performed by Statistical Product and Service Solutions version (SPSS 20.0, IBM, Armonk, NY, USA). Continuous variables were compared using two-sample t-tests, and categorical variables were compared using chi-squared tests. Group differences were considered significant if p-value is < 0.05.

For the statistical analysis of the GCA, we used RESTplus to conduct a two-sample t-test between the ASD and TD groups with age, gender, and mean frame displacement (FD; Jenkinson et al., 2002) as covariates. To make the subsequent image-based meta-analysis to integrate all statistical information from the whole brain and improve the statistical power (Salimi-Khorshidi et al., 2009; Müller et al., 2018; Jia et al., 2021), we did not conduct multiple comparison correction for the statistical analysis results of GCA and shared the uncorrected statistical parametric maps (http://restfmri.net/ABIDE-RTPJ-FC.zip).

Then, AES-SDM Software V5.15 (https://www.sdmproject.com) was used to conduct a meta-analysis on the original uncorrected statistical parametric maps of the GCA results calculated from the ABIDE dataset (Radua et al., 2012, 2014). AES-SDM calculated the effect-size maps and effect-size variance maps by integrating the statistical parametric map and the differences in effect sizes between the groups. In our study, we first set the gray matter correlation template with the recommended full anisotropy = 1.0. Subsequently, to better balance the sensitivity and specificity of AES-SDM and to improve statistical stability, FWHM = 20 mm and 20 randomizations were applied to preprocess the original uncorrected t-maps of the GCA of all the included sites (Radua et al., 2012, 2014). Next, we performed a mean analysis, i.e., the main meta-analysis method. The main threshold of a p-value < 0.0005 (Chan and Han, 2020) and an additional z-based threshold of z > 1 were adopted to reduce the possibility of false-positive results. Then, the recommended extent threshold of 10 voxels was applied to exclude smaller clusters (Radua et al., 2012). Finally, we created a mask to extract the values of the areas with significant differences to further present the results.

Results

Demographic and Clinical Information

Initially, a total of 2,168 participants from ABIDE I and ABIDE II were included in our study. Among these, 714 participants were excluded for the following reasons: 30 participants were deleted for missing functional or structural images, 213 for poor normalization effect, 228 for excessive head motion (translation or rotation more than 3 mm or 3°), 188 not being right-handed, and four sites (55 participants) were excluded due to no TD participants. Finally, 618 individuals with ASD and 836 TD participants were included. Demographic information is shown in Table 1.

GCA Meta-Analysis Results

Seed to the Whole Brain GCA in Meta-Analysis

The results of the meta-analysis of the GCA showed that, compared with the TD group, the GCA values of the ASD group from the RTPJ to the right fusiform, the left inferior temporal gyrus (ITG), the right middle temporal gyrus (MTG), and the left precuneus were higher. However, the left insula, the left anterior cingulate cortex (ACC), the left middle frontal gyrus (MFG), and the left superior frontal gyrus (SFG) were lower than those of the TD group (p < 0.0005, Table 2, Figure 1A).

Figure 1

The Whole Brain to Seed GCA in Meta-Analysis

Compared with the TD group, the results of the meta-analysis of the GCA showed that the GCA values of the ASD group from the right precentral gyrus, the right MFG, the right thalamus, and the right SFG to the RTPJ were significantly higher than those of the TD group. However, the GCA values from the left precentral gyrus, the left fusiform, the right lingual gyrus, and the left inferior occipital gyrus (IOG) to the RTPJ were significantly lower than those of the TD group (p < 0.0005, Table 3, Figure 1B).

Discussion

In the current study, we conducted an image-based mate-analysis to explore the GCA alterations of ASD with the RTPJ as the ROI. Our results demonstrated that the atypical effective connectivity of the RTPJ in individuals with ASD was widely distributed, mainly in the fusiform, the insula, and the PFC. These brain regions play essential roles in face processing, self-awareness, and understanding others and are associated with social impairment in individuals with ASD. This suggested that the RTPJ is a multi-functional brain region that is extensively involved in multiple functions related to society. From the perspective of the direction of interaction between RTPJ and the above brain regions, we could deepen our understanding of the brain mechanisms of social impairment in ASD.

The fusiform, lingual gyrus, and IOG are all important components of the ventral occipitotemporal cortex (VOTC) and are jointly involved in the processing of visual stimuli, especially in relation to face recognition of ASD (Humphreys et al., 2008; Price and Devlin, 2011; Domes et al., 2013; Mamashli et al., 2021). Face recognition is a necessary social skill in social activities such as peer interaction, while its deficit is considered a core deficit in individuals with ASD (Griffin et al., 2021). The fusiform is most closely related to face recognition, and it is also one of the brain regions of the “social brain” (Frith and Frith, 2010). Previous studies showed increased functional connectivity of the RTPJ with the fusiform and lingual gyrus in ASD (Chien et al., 2015). Besides, the MTG is also associated with face processing disorder in ASD (van Veluw and Chance, 2014; O'Hearn et al., 2020; Liu et al., 2021). Our results supported these results and further revealed the direction of the connectivity. Specifically, the ASD group showed higher effective connectivity from the RTPJ to the fusiform and MTG, but the effective connectivity from the fusiform, the lingual gyrus, and the IOG to the RTPJ was lower than TD. Notably, the neural circuit between the RTPJ and the fusiform might reflect that impaired fusiform function could affect its ability to transmit face processing information to the RTPJ, a brain region responsible for integrating external input stimuli, and in turn, the RTPJ would like to send more information to the fusiform. This might suggest interference in the processing of important inputs related to social cognition and is associated with social impairment with ASD.

Self-awareness is a pivotal component of conscious experience and conscious self-regulation of behavior (Lou, 2012). Some studies demonstrated that individuals with ASD had impaired self-awareness (Verhoeven et al., 2012), performed stronger self-experience, and had clearer self-boundaries (Crespi and Dinsdale, 2019; Mul et al., 2019). Self-awareness includes physical self-awareness and mental self-awareness. The insula was an important brain region that constituted the core of the physical self-awareness (Wiebking et al., 2014, 2015) and was responsible for primary (objective) interoceptive signals re-represented to higher (subjective) sensory states through the integration of information with other brain regions (Craig, 2009; Wang et al., 2020a). Previous studies demonstrated that the TPJ is connected to the anterior insula via the middle longitudinal fasciculus and extreme capsule (Saur et al., 2008). TPJ collaborated with the insula to integrate the multiple sensory and sensorimotor signals, thus constituting a coherent physical self-awareness (Park and Blanke, 2019). Our results suggested that ASD had lower effective connectivity from the left insula to the RTPJ, which is consistent with previous research. It was found that disrupted connectivity between the TPJ and the insula might cause individuals to lose awareness of the contralesional half of the body (Committeri et al., 2006). We further provided directional information for this disruption of connectivity, and this “personal neglect” might be associated with insufficient information received by the TPJ from the insula. The insula is not only involved in the processing of the physical self-awareness but also in the processing of the mental self-awareness (Qin et al., 2020) together with brain regions of the default mode network, such as the precuneus (van Veluw and Chance, 2014) and the ACC (Kana et al., 2017). Our study found that effective connectivity from the RTPJ to the left precuneus was increased and effective connectivity from the RTPJ to the left insula and the left ACC was decreased in the ASD group. Although the insula, the ACC, and the precuneus were all related to impaired self-processing in ASD, their underlying mechanisms are different and future studies should further investigate the differences in the interaction between brain regions.

Furthermore, previous studies found that the ITG (Apps et al., 2012) and the precentral gyrus (Olivé et al., 2015; Rabellino et al., 2018) were also involved in self-awareness processing. However, few have investigated functional connectivity or effective connectivity between these brain regions and RTPJ. Our results revealed the effective connectivity from the RTPJ to the left ITG was higher in the ASD group. The effective connectivity from the right precentral gyrus to RTPJ was higher but was lower from the left precentral gyrus to the RTPJ. This might be affected by the abnormality of the sensorimotor cortex in ASD and is related to impaired self-awareness and social functions.

The PFC plays an important role in the social understanding of others, where the connectivity with the TPJ is primarily related to understanding the mental state of others (Andrews-Hanna et al., 2010; Libero et al., 2014). Previous studies showed that functional connectivity between the PFC and the TPJ decreased when individuals with ASD performed the social task (Burnett and Blakemore, 2009; Baumgartner et al., 2012). Our results demonstrated that the effective connectivity of the ASD group was lower than that of the TD group from the RTPJ to the left MFG and the left SFG but higher than that from the right MFG and the right SFG to the RTPJ. This might be related to the different functions between the TPJ and PFC in understanding the mental states of others. Previous research found that the PFC is associated with internal focusing processes that understand the content of others' thoughts, whereas the TPJ is associated with external focusing processes (Lieberman, 2007). Therefore, the atypical neural circuit between the RTPJ and the PFC suggests that individuals with ASD have difficulty integrating internal states and external features of others and are related to ASD's impairment in distinguishing between self and others. In addition to PFC, we also found that the effective connectivity from the right thalamus to the RTPJ was higher in the ASD group. This is consistent with previous studies, which suggested that enhanced functional connectivity between the TPJ and the thalamus in individuals with ASD reflects increased stress in social cognitive processes and affects the social perceptual performance of the TPJ (Kana et al., 2014; Woodward et al., 2017).

Previous studies suggested that GCA may be affected by HRF confounding effects due to variability in timing, amplitude, shape, and latency of HRF in different brain regions and participants (Miezin et al., 2000; Handwerker et al., 2012; Badillo et al., 2013). To overcome this problem, we used a blind deconvolution technique developed by Wu et al. to eliminate the effect of HRF and deconvolute BOLD signals into neural signals (Wu et al., 2013, 2021). The effectiveness of this technique has been recognized in studies of loss of consciousness induced by anesthesia and pathology (Wu et al., 2019), chronic pain without explicit onset (Wu and Marinazzo, 2015), and heart rate variability (Wu and Marinazzo, 2016).

There are some limitations to our study. First, we only chose the RTPJ as the region of interest since the TPJ on the right hemisphere was related to attention, empathy, and other social functions. However, this may ignore some important information about the TPJ on the left side. Second, cross-sectional group data from the public dataset of the present study did not allow us to assess the dynamic change of the GCA; therefore, future longitudinal studies are needed. Third, the lack of behavioral measures in the current study led to a limited interpretation of the fMRI results, which should be combined with behavioral measures in future studies to better interpret the fMRI results. Finally, a previous study performed simulations on a task-based date to indicate the monotonic relationship between GCA at the neural level and GCA in the simulated blood oxygenation level-dependent (BOLD) signals (Wen et al., 2013). However, future studies are needed to demonstrate a similar monotonic relationship in resting-state data.

Conclusion

In conclusion, the current study found that individuals with ASD showed abnormal effective connectivity between the RTPJ and the brain regions related to the impairment of social and other domains. It helps to further elucidate the pathophysiological mechanisms of ASD and improve the early clinical screening of ASD. At the same time, it also contributes to a more directional treatment of ASD in future and promotes the development of ASD treatment.

Funding

This work was supported by the National Natural Science Foundation of China (82001898) and the Youth Science and Technology Plan of Soochow Science and Technology Bureau and Soochow Health Planning Commission (KJXW2020065).

Publisher's Note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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