scholarly journals Neural systems underlying affective disorders

2003 ◽  
Vol 9 (6) ◽  
pp. 446-455 ◽  
Author(s):  
Simon Surguladze ◽  
Paul Keedwell ◽  
Mary Phillips
Keyword(s):  
Affective Disorders ◽  
Mood Induction ◽  
Functional Neuroimaging ◽  
Bipolar Depression ◽  
Temporal Cortex ◽  
Anterior Cingulate ◽  
Neural Systems ◽  
Emotional Facial Expressions ◽  
Complex Picture ◽  
Lesion Studies

Three main approaches are used to explore the neural correlates of mood disorder: neuropsychological studies, neuroimaging studies and post-mortem investigations. Lesion studies implicate disturbances in the frontal lobe, basal ganglia, striatum and anterior temporal cortex. Early neurocognitive and neuropathological investigations led to a ‘hypofrontality’ hypothesis of unipolar and bipolar depression, but functional neuroimaging has revealed a more complex picture. Thus, increased metabolism may occur in the subgenual anterior cingulate gyrus in resting-state studies of depression and sad-mood induction. Antidepressants may reduce this activity. Amygdala hyperactivation also is associated with affective disorders. Task-related studies reveal abnormal biases in memory, the experience of pleasure and the perception of emotional facial expressions. There is still little clarity whether the abnormalities in brain activation represent state or trait characteristics of affective disorders.

scholarly journals Partially dissociable roles of OFC and ACC in stimulus-guided and action-guided decision making

2014 ◽  
Vol 111 (9) ◽  
pp. 1717-1720 ◽  
Author(s):  
Abbas Khani
Keyword(s):  
Decision Making ◽  
Anterior Cingulate Cortex ◽  
Orbitofrontal Cortex ◽  
Single Neuron ◽  
Cingulate Cortex ◽  
Anterior Cingulate ◽  
Functional Specialization ◽  
Complex Picture ◽  
Lesion Studies ◽  
The Brain

Recently, the functional specialization of prefrontal areas of the brain, and, specifically, the functional dissociation of the orbitofrontal cortex (OFC) and the anterior cingulate cortex (ACC), during decision making have become a particular focus of research. A number of neuropsychological and lesion studies have shown that the OFC and ACC have dissociable functions in various dimensions of decision making, which are supported by their different anatomical connections. A recent single-neuron study, however, described a more complex picture of the functional dissociation between these two frontal regions during decision making. Here, I discuss the results of that study and consider alternative interpretations in connection with other findings.

scholarly journals Different Neural Responses to a Moral Valence Decision Task in Unipolar and Bipolar Depression

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Daniele Radaelli ◽  
Sara Dallaspezia ◽  
Sara Poletti ◽  
Enrico Smeraldi ◽  
Andrea Falini ◽  
...  
Keyword(s):  
Bipolar Depression ◽  
Temporal Cortex ◽  
Occipital Cortex ◽  
Anterior Cingulate ◽  
Decision Task ◽  
Neural Responses ◽  
Major Depressive ◽  
Biological Substrates ◽  
Medial Pfc ◽  
Moral Valence

Objectives. Patients affected by bipolar disorder (BP) and major depressive disorder (UP) share the susceptibility to experience depression and differ in their susceptibility to mania, but clinical studies suggest that the biological substrates of the two disorders could influence the apparently similar depressive phases. The few brain imaging studies available described different brain metabolic and neural correlates of UP and BP. Methods. We studied the BOLD neural response to a moral valence decision task targeting the depressive biases in information processing in 36 subjects (14 BP, 11 UP, and 11 controls). Results. Main differences between UP and controls and between UP and BP were detected in left ventrolateral prefrontal cortex (PFC, BA 47). Neural responses of BP patients differed from those of control subjects in multiple brain areas, including anterior cingulate cortex (ACC) and medial PFC, bilateral dorsolateral PFC, temporal cortex and insula, and parietal and occipital cortex. Conclusions. Our results are in agreement with hypotheses of dysfunctions in corticolimbic circuitries regulating affects and emotions in mood disorders and suggest that specific abnormalities, particularly in ventrolateral PFC, are not the same in UP and BP depression.

Exploring an Emotional Basis of Cognitive Control in the Flanker Task

2020 ◽  
Author(s):  
Motonori Yamaguchi ◽  
Jack Dylan Moore ◽  
Sarah Hendry ◽  
Felicity Wolohan
Keyword(s):  
Cognitive Control ◽  
Facial Expressions ◽  
Mood Induction ◽  
Flanker Task ◽  
Emotional Stimuli ◽  
Emotional Facial Expressions ◽  
Flanker Effect ◽  
Sequential Modulation ◽  
Emotional Basis ◽  
Negative Stimuli

The emotional basis of cognitive control has been investigated in the flanker task with various procedures and materials across different studies. The present study examined the issue with the same flanker task but with different types of emotional stimuli and design. In seven experiments, the flanker effect and its sequential modulation according to the preceding trial type were assessed. Experiments 1 and 2 used affective pictures and emotional facial expressions as emotional stimuli, and positive and negative stimuli were intermixed. There was little evidence that emotional stimuli influenced cognitive control. Experiments 3 and 4 used the same affective pictures and facial expressions, but positive and negative stimuli were separated between different participant groups. Emotional stimuli reduced the flanker effect as well as its sequential modulation regardless of valence. Experiments 5 and 6 used affective pictures but manipulated arousal and valence of stimuli orthogonally The results did not replicate the reduced flanker effect or sequential modulation by valence, nor did they show consistent effects of arousal. Experiment 7 used a mood induction technique and showed that sequential modulation was positively correlated with valence rating (the higher the more positive) but was negatively correlated with arousal rating. These results are inconsistent with several previous findings and are difficult to reconcile within a single theoretical framework, confirming an elusive nature of the emotional basis of cognitive control in the flanker task.

scholarly journals Psychobiological risk factors for suicidal thoughts and behaviors in adolescence: a consideration of the role of puberty

2021 ◽  
Author(s):  
Tiffany C. Ho ◽  
Anthony J. Gifuni ◽  
Ian H. Gotlib
Keyword(s):  
Pubertal Timing ◽  
Anterior Cingulate ◽  
Neural Systems ◽  
Hormonal Changes ◽  
Suicidal Thoughts ◽  
Social Stressors ◽  
And Behaviors ◽  
Suicidal Thoughts And Behaviors ◽  
Pubertal Transition

AbstractSuicide is the second leading cause of death among adolescents. While clinicians and researchers have begun to recognize the importance of considering multidimensional factors in understanding risk for suicidal thoughts and behaviors (STBs) during this developmental period, the role of puberty has been largely ignored. In this review, we contend that the hormonal events that occur during puberty have significant effects on the organization and development of brain systems implicated in the regulation of social stressors, including amygdala, hippocampus, striatum, medial prefrontal cortex, orbitofrontal cortex, and anterior cingulate cortex. Guided by previous experimental work in adults, we also propose that the influence of pubertal hormones and social stressors on neural systems related to risk for STBs is especially critical to consider in adolescents with a neurobiological sensitivity to hormonal changes. Furthermore, facets of the pubertal transition, such as pubertal timing, warrant deeper investigation and may help us gain a more comprehensive understanding of sex differences in the neurobiological and psychosocial mechanisms underlying adolescent STBs. Ultimately, advancing our understanding of the pubertal processes that contribute to suicide risk will improve early detection and facilitate the development of more effective, sex-specific, psychiatric interventions for adolescents.

Anterior cingulate cortex neuro-metabolic changes underlying lithium-induced euthymia in bipolar depression: A longitudinal 1H-MRS study

2021 ◽  
Vol 49 ◽  
pp. 93-100
Author(s):  
M.G. Soeiro-de-Souza ◽  
E. Scotti-Muzzi ◽  
F. Fernandes ◽  
R.T. De Sousa ◽  
C.C. Leite ◽  
...  
Keyword(s):  
Anterior Cingulate Cortex ◽  
Bipolar Depression ◽  
Cingulate Cortex ◽  
Metabolic Changes ◽  
Anterior Cingulate ◽  
1H Mrs

Pramipexole in unipolar and bipolar depression

2004 ◽  
Vol 28 (12) ◽  
pp. 438-440 ◽  
Author(s):  
Eromona Whiskey ◽  
David Taylor
Keyword(s):  
Affective Disorders ◽  
Bipolar Depression ◽  
Case Reports ◽  
Unipolar Depression ◽  
Clinical Implications ◽  
Clinical Use ◽  
Limited Data ◽  
Double Blind ◽  
Reference Sections ◽  
Wide Range

Aims and MethodTo review the evidence for this use of pramipexole in the treatment of unipolar and bipolar depression, a literature search on Embase and Medline was conducted in December 2003. The search was updated in July 2004. The reference sections of retrieved papers were searched for further relevant references.ResultsThere are limited data on the clinical use of pramipexole in affective disorders. Only two double-blind trials in bipolar depression and one in unipolar depression were retrieved. Most information is in the form of case reports and open studies. No dose-response relationships have been established and a wide range of doses has been employed in the reports.Clinical ImplicationsIn view of the fact that the evidence for the use of pramipexole is still limited at the time of writing, its routine clinical use cannot be recommended. The data appear promising, but further research is required to determine its role in affective disorders.

Modulation of the Visual Word Retrieval System in Writing: A Functional MRI Study on the Japanese Orthographies

2002 ◽  
Vol 14 (1) ◽  
pp. 104-115 ◽  
Author(s):  
Kimihiro Nakamura ◽  
Manabu Honda ◽  
Shigeru Hirano ◽  
Tatsuhide Oga ◽  
Nobukatsu Sawamoto ◽  
...  
Keyword(s):  
Retrieval System ◽  
Temporal Cortex ◽  
Visual Word ◽  
Word Retrieval ◽  
Anterior Cingulate ◽  
Input Stimulus ◽  
Semantic Judgment ◽  
Cortical Regions ◽  
Mri Study ◽  
Mental Recall

We used functional magnetic resonance imaging (fMRI) to examine whether the act of writing involves different neuro-psychological mechanisms between the two script systems of the Japanese language: kanji (ideogram) and kana (phonogram). The main experiments employed a 2 × 2 factorial design that comprised writing-to-dictation and visual mental recall for kanji and kana. For both scripts, the actual writing produced a widespread fronto-parietal activation in the left hemisphere. Especially, writing of kanji activated the left posteroinferior temporal cortex (lPITC), whereas that of kana also yielded a trend of activation in the same area. Mental recall for both scripts activated similarly the left parieto-temporal regions including the lPITC. The writing versus mental recall comparison revealed greater activations in the left sensorimotor areas and right cerebellum. The kanji versus kana comparison showed increased responses in the left prefrontal and anterior cingulate areas. Especially, the lPITC showed a significant task-by-script interaction. Two additional control tasks, repetition (REP) and semantic judgment (SJ), activated the bilateral perisylvian areas, but enhanced the lPITC response only weakly. These results suggest that writing of the ideographic and phonographic scripts, although using the largely same cortical regions, each modulates the visual word-retrieval system according to their graphic features. Furthermore, comparisons with two additional tasks indicate that the activity of the lPITC increases especially in expressive language operations regardless of sensory modalities of the input stimulus.

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