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Neural and Cognitive Markers and Regulation of Emotion in Depression: A Mini-Review and a Short Case Report

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DOI: 10.4236/ojpsych.2017.74030    602 Downloads   1,153 Views  

ABSTRACT

In the presented short clinical case of depression, the constructs of Research Domain Criteria (RDoC) of loss (negative valence systems) and cognitive control (cognitive systems) have been operationalized. It has been concluded that a normal cognitive control of emotion, requiring the functional and structural integrity of prefrontal cortex (PFC) and orbitofrontal cortex (OFC), is lacking in depression, but its amelioration can be achieved through the implementation of cognitive remediation/rehabilitation programs. A mini-review on neural and cognitive markers and regulation of emotion in depression is previously presented.

1. Executive Function and Its Neural Correlates and Dysregulation of Emotion in Depression

Executive function (EF) is related with prefrontal cortex (PFC), and is studied through the assessment of cognitive control, working memory and emotional decision making. Cognitive control is measured by switching tasks that have in common the need of conflict resolution, involving the inhibition of a pre-potent response, due to over-learned previous response, in Stroop Task (ST), or due to being primed as part of the experimental procedure, in Wisconsin card sorting test (WCST). Working memory tasks require holding information in working memory, such as Corsi block test, Tower of Hanoi/London (TOL). The emotional decision making tasks, such as the Iowa gambling task (IGT), require that participants weigh, toward a specific goal, the relative contributions of rewards and punishments. A tripartite model of EF includes the abilities to form, maintain and shift mental set. Mental set formation, through planning, using focused attention, generativity, memory retrieval, working memory, sequencing, requires the integrity of dorsolateral PFC (DLPFC), whose lesion determines a disorganized neuro-behavioral syndrome. Mental set maintenance, through implementation/monitoring, using response initiation, response selection and conflict resolution, selective attention, self-monitoring and attentional vigilance, requires the integrity of superior medial PFC, whose lesion determines an apathetic neurobehavioral syndrome. Mental set maintenance, through social appropriateness, using response inhibition and discrepancy detection, requires the integrity of ventral medial PFC (ventral MPFC) and orbitofrontal cortex (OFC), whose lesion determines a disinhibited or psychopathic neurobehavioral syndrome. Mental set shifting, through problem solving, using discrepancy detection, cognitive flexibility, attentional shifting, generativity, memory retrieval and working memory, requires the integrity of DLPFC, whose lesion also determines a perseverative neurobehavioral syndrome [1] [2] . Deficit in inhibition of negative stimuli processing is related with difficulty in reappraising [3] [4] , decreased cognitive flexibility is associated with rumination [5] , and normal executive function is related with a frequent use of reappraisal (compared to expressive suppression) [6] . The function of cognitive control network (CCN), which includes the dorsal anterior cingulate cortex (dACC), DLPFC and posterior parietal regions [7] , may be critical to reappraisal, through the allocation of resources to goal directed behaviors it facilitates. The dACC is involved in detection and monitoring of affective and non-affective stimuli and the ventral/rostral ACC primarily works with the posterior parietal and DLPFC regions of the CCN to regulate affective responses [8] ; the DLPFC is involved in the interpretation’s modulation of processed information from emotion perception regions [9] - [14] . The generation and experience of emotions depend on subcortical (amygdala, ventral striatum, periaqueductal gray matter) and limbic structures (dACC, anterior insula), and their regulation is concretized by CCN, ventrolateral PFC and MPFC [8] . The default mode network of brain function (DMN) includes the precuneus/posterior cingulate cortex, parietal cortex and MPFC [15] [16] . Patients with major depressive disorder ruminate and use reappraisal less often than healthy controls [17] , and inefficient emotion regulation can predict subsequent depression relapse and severity [18] [19] . During depression’s state, the hypoconnectivity of CCN predicts deficit in remission following pharmacotherapy [20] [21] [22] [23] . In depression, abnormal connectivity of MPFC with posterior aspects of the DMN is relate with overgeneralized autobiographical memory (and its contribution to negative bias about past life experiences), and abnormal connectivity of anterior aspects of the DMN (ventral MPFC) is related with negative self-referential processing (rumination, guilt, negative bias) [9] - [14] , [24] [25] [26] [27] . The deficits of the neural networks which sustain regulatory functions of cognition are frequent in various psychiatric disorders [28] , and, according to Lantrip and Huang, pre-illness emotion dysregulation is a marker of underlying CCN and DMN alteration that later may manifest as affective or cognitive illness [29] .

2. Clinical Case

A 44-year-old, right-handed, female, Portuguese patient, with 9 years of schooling, complained of depressive symptoms. Informed consent from the patient has been obtained, regarding namely the therapeutic intervention she has been subjected and the scientific presentation of her clinical case. She completed the demographic and symptom questionnaire, which included the 17 item-Hamilton Depression Rating Scale (HAM-D-17) [30] and the Personality Diagnostic Questionnaire-4 [31] , and performed the Portuguese version of computerized tasks, from PEBL [32] : TOL [33] ; IGT [34] ; Victoria ST [35] ; WCST and FT [36] [37] . At the time of the first assessment (at “time 1”), the patient presented significant depressive symptoms and suicidal ideation and intention, as well as avoidant personality traits. She didn’t present a history of bipolar depression, schizophrenia or previous psychotic symptoms, nor meet the diagnostic criteria for neurodegenerative disease, substance abuse, neurological disease or traumatic brain injury, as categorized by the 10th revision of the International Classification of Diseases, from World Health Organization, and the 5th edition of the Diagnostic and Statistical Manual of Mental Disorders, from American Psychiatric Association (DSM-5). DSM-5 diagnostic criteria for major depressive disorder include: 1) five (or more) of the following symptoms have been present during the same 2-week period and represent a change from previous functioning (noting that, at least, one of the symptoms is either depressed mood or loss of interest or pleasure): depressed mood most of the day, nearly every day, as indicated by either subjective report or observation made by others; markedly diminished interest or pleasure in all, or almost all, activities most of the day, nearly every day; significant weight loss when not dieting or weight gain or decrease or increase in appetite nearly every day; insomnia or hypersomnia nearly every day; psychomotor agitation or retardation nearly every day; fatigue or loss of energy nearly every day; feelings of worthlessness or excessive or inappropriate guilt nearly every day; diminished ability to think or concentrate, or indecisiveness, nearly every day; recurrent thoughts of death, recurrent suicidal ideation without a specific plan, or a suicide attempt or a specific plan for committing suicide; 2) the symptoms cause clinically significant distress or impairment in social, occupational or other important areas of functioning; 3) the episode is not attributable to the physiological effects of a substance or to another medical condition (noting that criteria 1 - 3 represent a major depressive episode, and responses to a significant loss, i.e., bereavement, financial ruin, losses from a natural disaster, a serious medical illness or disability) may include the feelings of intense sadness, rumination about the loss, insomnia, poor appetite, and weight loss noted in criterion A, which may resemble a depressive episode, and, although such symptoms may be understandable or considered appropriate to the loss, the presence of a major depressive episode in addition to the normal response to a significant loss should also be carefully considered, requiring this decision inevitably the exercise of clinical judgment based on the individual’s history and the cultural norms for the expression of distress in the contest of loss); 4) the occurrence of the major depressive episode is not better explained by schizoaffective disorder, schizophrenia, schizophreniform disorder, delusional disorder, or other specified and unspecified schizophrenia spectrum and other psychotic disorders; 5) there has never been a manic episode or a hypomanic episode. DSM-5 diagnostic criteria for mild neurocognitive disorder (NCD) include: the evidence of modest cognitive decline from a previous level of performance in one or more cognitive domains―complex attention, executive function, learning and memory, language, perceptual motor, or social cognition―based on concern of the individual, a knowledgeable informant, or the clinician that there has been a mild decline in cognitive function; the evidence of modest impairment in cognitive performance preferably documented by standardized neuropsychological testing or, in its absence, another quantified clinical assessment; the absence of interference of the cognitive deficits with capacity for independence in everyday activities (but greater effort, compensatory strategies, or accommodation may be required). Concerning the present case differential diagnosis, the NCD category encompasses the group of disorders in which the primary clinical deficit is in cognitive function, and that are acquired rather than developmental, thus representing a decline from a previously attained level of functioning. Cognitive deficits are present in (many if not) all mental disorders, but only disorders whose core features are cognitive are included in the NCD category. Patients with depression and “reversible” NCD exhibit more psychic and somatic anxiety, early morning awakening and loss of libido, but some patients with depressive symptomatology and “reversible” NCD progress into irreversible NCD [38] [39] [40] . The domains and the constructs of Research Domain Criteria from the National Institutes of Mental Health, namely negative valence systems (loss) and cognitive systems (cognitive control), have been operationalized. Negative valence systems are primarily responsible for responses to aversive situations or context, such as fear, anxiety and loss. Loss is a state of deprivation of a motivationally significant con-specific, object, or situation, and may be social or non-social and may include permanent or sustained loss of shelter, behavioral control, status, loved ones or relationships. The response to loss may be episodic (e.g., grief) or sustained. Cognitive control is a system that modulates the operation of other cognitive and emotional systems, in the service of goal-directed behavior, when pre-potent modes of responding are not adequate to meet the demands of the current context, and, additionally, control processes are engaged in the case of novel contexts, where appropriate responses need to be selected from among competing alternatives. Response selection and inhibition/suppression are functions of cognitive control [41] . For the z-score analysis, the patient neuropsychological results (at “time 1”) were compared with the reference sample, by age. After the completion of a cognitive stimulation/rehabilitation program (30 sessions, with three levels of difficulty) (at “time 2”), it has been verified, concomitant with decreased affective symptomatology, an improvement in executive/cognitive function, in particular, at planning, decision making, set shifting/cognitive flexibility and inhibitory control, which, index the re-assumption of the structural and functional integrity of PFC and OFC (Table 1 and Figure 1).

3. Concluding Remarks

A normal cognitive control of emotion, requiring the functional and structural integrity of prefrontal cortex (PFC) and orbitofrontal cortex (OFC), is lacking in depression, but its amelioration/remediation can be achieved through the implementation of cognitive remediation/rehabilitation programs. Computerized cognitive remediation through the induction of neuroplasticity and targeting brain networks, which sustains the cognitive control of emotion and clinical outcomes in disrupted negative valence systems and cognitive systems associated

Table 1. Longitudinal comparison of neuropsychological test scores in a patient with unipolar major depressive episode. Evidence of improvement of executive/cognitive function (planning, decision making, set shifting/cognitive flexibility and inhibitory control), concomitant with decreased affective symptomatology, in a 44 year-old female, acutely depressed, patient after her subjection to a cognitive remediation/rehabilitation program (at “time 2”) (Note: HAM-D-17: 17 item Hamilton depression rating scale; FT-D: dominant hand from finger tapping task; FT-ND: non-dominant hand from finger tapping task; TOL-extra: extra moves from tower of London; IOWA-net score: net score from Iowa gambling task; WCST-PE: preservative errors from Wisconsin card sorting test; VStroop-Interf.: interference errors from Victoria Stroop task).

Figure 1. Graphical representation of longitudinal comparison of z score of performance of neuropsychological tasks concerning motor speed (FT), planning (TOL), decision making (Iowa), set shifting (WCST-PE) and inhibitory control (Stroop) in a patient with unipolar major depressive episode. Amelioration of planning, set shifting and inhibitory control after the completion of a cognitive remediation/rehabilitation program (Note: FT: dominant hand from finger tapping task; TOL: extra moves from tower of London; IOWA: net score from Iowa gambling task; WCST: preservative errors from Wisconsin card sorting test; Stroop: interference errors from Victoria Stroop task).

with loss/depression, has the potential to improve emotional/affective symptomatology.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Eduardo, G. , Marco, M. and Alexandre, P. (2017) Neural and Cognitive Markers and Regulation of Emotion in Depression: A Mini-Review and a Short Case Report. Open Journal of Psychiatry, 7, 365-373. doi: 10.4236/ojpsych.2017.74030.

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