Is Our Self Related to Personality? A Neuropsychodynamic Model

The concept and the assessment of personality have been extensively discussed in psychoanalysis and in clinical psychology over the years. Nowadays there is large consensus in considering the constructs of the self and relatedness as central criterions to assess the personality and its disturbances. However, the relation between the psychological organization of personality, the construct of the self, and its neuronal correlates remain unclear. Based on the recent empirical data on the neural correlates of the self (and others), on the importance of early relational and attachment experiences, and on the relation with the brain’s spontaneous/resting state activity (rest–self overlap/containment), we propose here a multilayered model of the self with: (i) relational alignment; (ii) self-constitution; (iii) self-manifestation; and (iv) self-expansion. Importantly, these different layers of the self can be characterized by different neuronal correlates—this results in different neuronally grounded configurations or organizations of personality. These layers correspond to different levels of personality organization, such as psychotic (as related to the layer of self-constitution), borderline (as related to the layer of self-manifestation) and neurotic (as related to the layer of self-expansion). Taken together, we provide here for the first time a neurobiologically and clinically grounded model of personality organization, which carries major psychodynamic and neuroscientific implications. The study of the spontaneous activity of the brain, intrinsically related to the self (rest–self overlap/containment) and the interaction with stimuli (rest–stimulus interaction) may represent a further advance in understanding how our default state plays a crucial role in navigating through the internal world and the external reality.

The concept and the assessment of personality have been extensively discussed in psychoanalysis and in clinical psychology over the years. Nowadays there is large consensus in considering the constructs of the self and relatedness as central criterions to assess the personality and its disturbances. However, the relation between the psychological organization of personality, the construct of the self, and its neuronal correlates remain unclear. Based on the recent empirical data on the neural correlates of the self (and others), on the importance of early relational and attachment experiences, and on the relation with the brain's spontaneous/resting state activity (rest-self overlap/containment), we propose here a multilayered model of the self with: (i) relational alignment; (ii) self-constitution; (iii) self-manifestation; and (iv) self-expansion. Importantly, these different layers of the self can be characterized by different neuronal correlates-this results in different neuronally grounded configurations or organizations of personality. These layers correspond to different levels of personality organization, such as psychotic (as related to the layer of self-constitution), borderline (as related to the layer of self-manifestation) and neurotic (as related to the layer of self-expansion). Taken together, we provide here for the first time a neurobiologically and clinically grounded model of personality organization, which carries major psychodynamic and neuroscientific implications. The study of the spontaneous activity of the brain, intrinsically related to the self (rest-self overlap/containment) and the interaction with stimuli (rest-stimulus interaction) may represent a further advance in understanding how our default state plays a crucial role in navigating through the internal world and the external reality. differentiation and relatedness, lack or transient loss in reality testing, problems in affect and impulse regulation, mentalization and attention and inflexibility and rigidity in several domains (Kernberg and Caligor, 2005;Bateman and Fonagy, 2010;Kernberg, 2016;Lingiardi and McWilliams, 2017).
Historically several authors tried to classify patients who did not reach the criteria to be placed either in neurotic or in psychotic diagnosis (e.g., Knight, 1953). However, it was only in 1967 that Kernberg (1967) proposed a broader concept of Borderline personality organization (BPO), which included the evaluation of the identity (see also Erikson, 1968), of defense mechanisms and reality testing, as closely associated with the continuity and coherence of the sense of self and significant others. Kohut (1971) conceptualized how a failure in the development of a cohesive sense of the self, depending from the interaction with the environment, leads to a fragmentation of the body, self, mind and the self-object. Recently, several authors, departing from the background of the attachment theory (Schore, 2000(Schore, , 2001(Schore, , 2012Lyons-Ruth, 2003, 2008Fonagy et al., 2007;Mucci, 2013Mucci, , 2017Beebe and Lachmann, 2014), proposed that the parent-infant dyad can be considered as the first intersubjective encounter that predisposes the development of the self and emphasized how the dual caregiver-infant exchange continuously modulates the formation of the growing subject, organizing the mind-body-brain interoceptive and exteroceptive connections in relation to the other.
Nowadays there are empirical evidences postulating that the degree of impairments in levels of self-definition and interpersonal relations are core features in defining the personality disorders (see Bender et al., 2011;Morey et al., 2011;DSM-5, American Psychiatric Association, 2013). The intrapsychic structure of the self-other personality organization is based on a neurobiological one (Kernberg, 2015).

NEUROSCIENTIFIC CORRELATES OF THE SELF AND ITS RELATION WITH THE BRAIN'S SPONTANEOUS/RESTING STATE ACTIVITY
The self has been investigated extensively in neuroscience and has been related to a cerebral network also recruited during the resting state, the other's mind-reading, autobiographical memory, enhanced perception and embodied simulation (Metzinger and Gallese, 2003;Wicker et al., 2003;Gillihan and Farah, 2005;Northoff et al., 2006;Legrand and Ruby, 2009;. Among others, authors such as Northoff (Northoff and Bermpohl, 2004;Northoff et al., 2006;Northoff and Panksepp, 2008;Damasio, 2010Damasio, , 2012Panksepp and Biven, 2012) emphasized the existence of a complex, distributed and functionally based system of the self. The core self (Panksepp, 1998a,b) is considered as a trans-species functional entity based on subcortical midline structures (SCMS), in a mutually regulating process with the higher CMS, a more complex, reflective and conscious self-distributed sytem. This system allows the linking of the external events to the internal (motivational and emotional) impulses of the organism (Panksepp and Biven, 2012).
Based on these findings one may hypothesize that the spontaneous activity of the brain may contain some specific information related to the self, serving to process and assign contents to the subsequent internal or external stimuli. Therefore, one may conceptualize a ''rest-self overlap/containment'' Northoff, 2016a), where the self-specific information, not only overlap with the resting state, but are contained in the spontaneous activity and may provide the basis for the assignment of contents as processed in affective, cognitive, social and sensorimotor functions.

EARLY RELATIONAL EXPERIENCES, ATTACHMENT AND THE DEVELOPMENT OF THE SELF FROM THE OTHER
Early relational experiences and attachment play a fundamental role in shaping the sense of self, the sense of relatedness, and the capacities to regulate emotions and to mentalize, leading to what Bowlby (1969) has defined as internal working models (IWM). The relational internalization of benign or adverse interpersonal experiences is enabled by the human capacity for intersubjectivity, attunement and empathy, which are present from birth (Stern, 1985;Meltzoff and Brooks, 2001;Trevarthen, 2001;Meltzoff and Decety, 2003;Tronick, 2007). FIGURE 1 | Schematic illustration for the study of the "Brain, Self and Personality": the Rest-Self overlap/containment and Rest-Stimulus interaction model.
Traumatic experiences, particularly attachment trauma and early relational adverse experiences, not only foster dissociation and psychopathology (Schimmenti, 2017) creating a vertical disconnection in the mind-brain-body system but also elicit the impulsivity, lack of effortful control, emotional dysregulation and use of immature defenses that are characteristics of self-other pathologies (see alternative model of personality disorders, DSM-5, 2013), such as BPO or maladaptive personality pathologies in general (Mucci, 2016(Mucci, , 2018Granieri et al., 2017Granieri et al., , 2018. The enduring effect of early traumatization does not allow the connection between the limbic areas and superior orbito-frontal areas (Schore, 2000(Schore, , 2001(Schore, , 2003(Schore, , 2012 creating the dysfunctions typical of personality pathologies, characterized by long-term abuse and dysfunctional families (Felitti et al., 1998;Mucci, 2013;Schimmenti and Caretti, 2016;Liotti, 2017;Scalabrini et al., 2017a). Decety and Sommerville (2003) proposed how the distinct cognitive representations of self and others are related to self-other processing in the brain and how the right hemisphere plays a predominant role in the way that the self is connected to the other. In this regard, Schore has suggested that early relational trauma between mother and child alters the development of the right brain (Schore, 2001).
The early growth and maturation of brain regions involved in self and social development (Pfeifer and Peake, 2012) is experience-dependent and requires nurturing self-other interactions in the context of attachment for developing the capacity to regulate cognitive and emotional states (Messina et al., 2016b). For instance, a recent study (Brauer et al., 2016) indicated how 5-year old children exposed to higher maternal touch experiences show additional regional connectivity within the right dorso-medial prefrontal cortex and may benefit in terms of ''social brain development.'' In contrast, when an individual is denied these positive experiences, serious failures of self-development occur (Schore, 2005;Messina et al., 2016a;Mucci, 2016Mucci, , 2018. Recently, several studies investigated the neurobiology of attachment in animals (Insel and Young, 2001) and humans using functional magnetic resonance imaging (fMRI; Lorberbaum et al., 2002;Bartels and Zeki, 2004;Swain et al., 2007;Strathearn et al., 2008;Laurita et al., 2017Laurita et al., , 2018. These studies showed how the regions prevalently located in the CMS and limbic areas are fundamentally involved in the context of attachment and have an impact on self-other related functions. Other studies investigated the neural correlates of attachment trauma, as in the case of borderline personality disorder (e.g., Buchheim et al., 2008).
Departing from this background, if attachment influences the development of the self, the constitution, and the differentiation of the self and others and is considered closely linked to SR processing (Brockman, 2002;Northoff, 2011), we may expect an impact on the spontaneous/resting state activity of the brain, as suggested by a study showing a relation between increased measures of individual negative childhood experiences and a more entropic neuronal activity in medial prefrontal cortex during rest (Duncan et al., 2015; see Figure 1). Moreover, research on the resting state fMRI showed that emotional processing of attachment-related content induces carryover effects and alters the brain network configurations at rest (Krause et al., 2016(Krause et al., , 2018Borchardt et al., 2018).

NEUROPSYCHODYNAMIC MODEL OF SELF AND PERSONALITY ORGANIZATION
Given the role of the experience-dependent (or attachmentdependent) rest-self overlap/containment, we hypothesize that self-specific information of individuals, and their personality features, may be present in the resting state activity and may shape task-evoked activity.
In summary, the study of personality needs to consider the so-called rest-stimulus interaction (Northoff et al., 2010) as a way to conceive how the brain's intrinsic activity encodes self-specific information of the past and (possible) future inputoutput relationship (Northoff, 2016a).
In this context, we propose a novel conceptualization that aims to link the rest-self states and personality organization (see Figure 2).
In our view, different and interconnected states of the self are embedded in the intrinsic activity of the brain that predisposes the construction of subjectivity and consciousness (Northoff, 2017).
First, we propose that Relational Alignment is a prerequisite that gives the framework for the construction of the Self, a sort of neuro-ecological continuum between the brain and the external world. It is given by the first relational encounter with a caregiver and his/her capacity to attune with the mind-brain of the infant. The infant's brain, if facilitated by a secure environment, starts becoming a part of the world's time and space by the relational alignment with the temporo-spatial structure of the animate and inanimate reality (Schore, 2000(Schore, , 2001Trevarthen and Aitken, 2001;Pfeifer and Peake, 2012;Northoff, 2017). This predisposes the constitution and the development of the Self.
Self-Constitution represents the building blocks of the consciousness processing-it includes the construction (rather than perception) of both time and space. It is linked with the ownership of one's own body, location of self in space, authorship and control of one's own actions, and difference between fantasy and reality. It is linked with the capacity to distinguish the self from the non-self and internal from external. Thus, it is strongly connected with reality testing and it is the self-state that distinguishes the psychotic organization of personality from the others.
Self-Manifestation represents the actual consciousness in the present moment-it includes the experience of time and space, the perception of the environment, the affective and motivatinal system, the identification with social reality and cognitive functions such as thinking, imagining and mentalizing. It is particularly linked to the degree of integration of the self and the significant others. When the manifestation of the self oscillates between incoherent and/or disaggregated self-states we are navigating in the field of borderline and/or (early) trauma related pathologies.
Self-Expansion is linked with the stable and integrated aspects of the self in time and space: (a) autobiographical self, (b) social self, (c) linguistic self, and (d) mental self. It refers to the capacity to inhibit behaviors and to tolerate the ambivalence of the affects considering the past, present and future. The higher the capacity to self-expand and bind information in perception and memory , the higher the integration of various aspects of the self and others. A difficulty in self-expansion may be related to a difficulty in elaborating an external stimulus or an internal conflict as in neuroticism.
How are these different states of the self linked to the intrapsychic structure of individuals?
Since the brain's intrinsic activity can be characterized by an individualized temporo-spatial structure, we suppose that all contents (whether affective, cognitive, social, or sensorimotor) and their underlying extrinsic activity must first and foremost be integrated within the brain's spontaneous (internal) activity. The degree and the way the contents and their activities are integrated into the brain's spontaneous activity determine how we perceive them and hence how we experience them, i.e., our subjective or self-conscious experience of reality (Northoff, 2016a,b,c;Northoff and Huang, 2017).
Psychotic personality organization (PPO) on a psychological level is characterized by identity diffusion, primitive defense mechanism, and loss of reality testing. On a neurobiological level we may find disturbances at a level of Self-Constitution, a disruption in the global organization of the brain's intrinsic activity (Northoff, 2015).
The whole topography over all the networks and frequency ranges are disrupted (Rotarska-Jagiela et al., 2010;Shim et al., 2010;Khadka et al., 2013) and, for instance, the usual negative correlation between the DMN and the Control Executive Network (CEN), that are usually characterized by anticorrelation, are in psychosis transformed into a positive correlation which in turn may lead to the breakdown of the rest-self overlap where there is a self-assignment to either internal or external stimuli (Carhart-Harris et al., 2012, 2013. In this case there is no possibility to differentiate the internal world from the external reality. The relationship from the CMS and the somatosensory network is altered, ending up in a lack of differentiation in processing the intrinsic and extrinsic stimuli (Ebisch and Aleman, 2016;Northoff and Duncan, 2016), which results in identity diffusion or fragmentation of Self-constitution. We may hypothesize that this psychotic organization shows severe impairments at a pre-phenomenal level of experience on the spatiotemporal structure of the brain's intrinsic activity (Northoff, 2016b,c).
BPO is characterized by intact reality testing, primitive defense mechanism based on splitting and projective identification and identity diffusion. At a neurobiological level we hypothesize that the whole brain topography and organization between the networks are partially preserved but the balance between them consequently shows abnormalities, as in the case of bipolar disorder (Magioncalda et al., 2015;Martino et al., 2016), and that the subsequent relation with the external stimuli may be impaired. Indeed, a recent meta-analysis (Visintin et al., 2016) shows increased activity in the regions spanning across the midline core of DMN in patients with borderline personality disorder during the resting state, which may imply difficulties in self-referential, social and emotional processing (Van Overwalle, 2009;Etkin et al., 2011).
We may find abnormalities in the rest-stimulus interaction (e.g., in narcissistic personality features; Scalabrini et al., 2017b) and lack of integration in the brain's self-other networks (Herpertz et al., 2018): for example, in borderline personality disorders we can observe alterations in the orbitofrontal cortex and the connected subcortical regions (Minzenberg et al., 2007;Koenigsberg et al., 2009;Enzi et al., 2013). Moreover, other studies have described the functional neuroanatomy of borderline disorders that are associated with the hypersensitivity, intolerance for aloneness, and attachment fears typical of patients in this broad diagnostic group (Buchheim et al., 2008;King-Casas et al., 2008;Fertuck et al., 2009;Dziobek et al., 2011).
We may hypothesize that individuals with BPO show severe impairments at a pre-reflective level of experience, at a Self-manifestation state, where the implicit encoded information (Mucci, 2016) about the experiences of self, body, and others are related to the spatiotemporal structure of the brain's intrinsic activity.
Neurotic personality organization (NPO) is characterized by intact reality testing, mature defense mechanism based on repression, and integrated sense of self and identity. In NPO we may find impairments at the Self-Expansion state, where at a neurobiological level we hypothesize that the whole brain's topography, organization between networks and balance between them are preserved but their coherence is not given for granted. We may expect to find a decreased coherence within the networks and decreased cross-frequency coupling while the spatiotemporal structure by itself is well integrated. In detail, we hypothesize that the measures such as functional connectivity provide no information on the intrinsic neuronal activity (Lu and Stein, 2014;Raichle, 2015), while the measures such as regional of homogeneity (ReHo), low frequency oscillation (LFO), and measures of complexity (e.g., Power Law exponent, H-Hurst) are more related to the intrinsic local brain activity, so that they may be more fine-grained to detect the trait-features of personality, as in the case of neuroticism. Studies investigating neuroticism in the resting state fMRI found that the ReHo in the prefrontal cortex was negatively modulated by the neurotic personality features (Wei et al., 2011;Gentili et al., 2017), thereby supporting the hypothesis of neurotic DMN alterations in the resting state analysis, as well as during task (Wei et al., 2011(Wei et al., , 2016Forbes et al., 2014;Sampaio et al., 2014;Tzschoppe et al., 2014).
Thus, NPO individuals have difficulty to expand and finalize their selves over time because of their internal conflicts. We may hypothesize that a certain incoherence in the brain functioning is related to the difficulty of these individuals in processing certain contents at the reflective level of the experience (explicit experience of cognitive, affective, social and sensorimotor functions).

CONCLUSION
Neuroscience has considerably advanced in revealing the neural correlates of the self, which are closely related to the cortical midline structure and their spontaneous activity. However, the relationship of self to its personality, as discussed in psychoanalysis and psychiatry, still remains to be further elucidated. The present article is a first attempt to bridge this gap. Based on the recent findings, we propose here a multilayered neuronally-based model of the self with: (i) relational alignment; (ii) self-constitution; (iii) self-manifestation; and (iv) self-expansion. We suggest that these layers of self correspond to the different levels of personality organization including psychotic, borderline and neurotic. These levels can be distinguished from each other through their neuronal and defense mechanisms.
This amounts to a novel neuropsychodynamic model of personality organization that bridges the gap between self, as dealt with in neuroscience and psychology, and personality as conceptualized in psychoanalysis.
Our perspective opens not only novel doors to our understanding of the personality and its alterations but also novel forms of therapeutic intervention, due to the neuronal basis in spontaneous activity of the brain. Therapeutic interventions need to achieve, first and foremost, a relational alignment between the therapist and the patient in order to lead the self to expand and be more connected to the internal world and external reality.

AUTHOR CONTRIBUTIONS
AS, CM and GN wrote the article.