國立虎尾科技大學 |

Childhood maltreatment and mechanisms of vulnerability within anhedonia and depression.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Childhood maltreatment and mechanisms of vulnerability within anhedonia and depression./
Author:	Cunningham, Simone.
Description:	1 online resource (88 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 75-01C.
Subject:	Clinical psychology. -
Online resource:	click for full text (PQDT)

Childhood maltreatment and mechanisms of vulnerability within anhedonia and depression.
Cunningham, Simone.

Childhood maltreatment and mechanisms of vulnerability within anhedonia and depression. - 1 online resource (88 pages)

Source: Dissertation Abstracts International, Volume: 75-01C.

Thesis (M.S.)--Queen's University (Canada), 2017.

Includes bibliographical references

Anhedonia is one of the defining features of Major Depressive Disorder (MDD), and may be characteristic of an especially severe depression. Because MDD is highly heterogeneous, anhedonia may represent an easier target for research on how childhood maltreatment is associated with MDD and anhedonia and on the underlying mechanisms of dysfunction within this disorder. The goal of the current study is to test the hypothesis that the association between childhood maltreatment and anhedonia is mediated by two endophenotypes: (a) blunted neuroendocrine response to stress, and (b) blunted responsivity to reward. Further, consistent with the related neurobiological underpinnings of threat and reward systems, we hypothesize that in our full sample, individual differences in stress reactivity will be correlated with individual differences in reward responsivity. The current study includes 89 adults (39 with MDD, 47 non-depressed) who were well-characterized in terms of their diagnostic and symptom profiles, and who participated in a laboratory stress challenge (the Trier Social Stress Task; TSST) and a computerized Probabilistic Reward Task (PRT). Our hypothesized mediation model was not supported by the results. However, I did find that blunted reward learning was correlated with blunted stress reactivity. Further, different forms of childhood maltreatment were preferentially associated with different symptoms of anhedonia. Contrary to hypotheses, I also found that within the depressed group, childhood maltreatment, depression severity, and anhedonia were positively correlated with response bias on the PRT. Also contrary to hypotheses, within the depressed group stress reactivity was positively associated with anhedonic symptoms, although these results were not statistically significant. Although our overall model was not supported by the results, my findings suggest that reward responsivity, stress reactivity, and anhedonia remain important research targets in understanding the etiology of MDD. These findings also help to shed light on the negative outcomes associated with childhood maltreatment.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

Subjects--Topical Terms:

649607
Clinical psychology.
Index Terms--Genre/Form:

554714
Electronic books.

Childhood maltreatment and mechanisms of vulnerability within anhedonia and depression.
LDR:03198ntm a2200289K 4500 001 915199
005 20180727091511.5
006 m o u
007 cr mn||||a|a||
008 190606s2017 xx obm 000 0 eng d
035 $a (MiAaPQ)AAI10671264
035 $a (MiAaPQ)QueensUCan197422645
035 $a AAI10671264
040 $a MiAaPQ $b eng $c MiAaPQ
100 1 $a Cunningham, Simone. $3 1188481
245 1 0 $a Childhood maltreatment and mechanisms of vulnerability within anhedonia and depression.
264 0 $c 2017
300 $a 1 online resource (88 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertation Abstracts International, Volume: 75-01C.
502 $a Thesis (M.S.)--Queen's University (Canada), 2017.
504 $a Includes bibliographical references
520 $a Anhedonia is one of the defining features of Major Depressive Disorder (MDD), and may be characteristic of an especially severe depression. Because MDD is highly heterogeneous, anhedonia may represent an easier target for research on how childhood maltreatment is associated with MDD and anhedonia and on the underlying mechanisms of dysfunction within this disorder. The goal of the current study is to test the hypothesis that the association between childhood maltreatment and anhedonia is mediated by two endophenotypes: (a) blunted neuroendocrine response to stress, and (b) blunted responsivity to reward. Further, consistent with the related neurobiological underpinnings of threat and reward systems, we hypothesize that in our full sample, individual differences in stress reactivity will be correlated with individual differences in reward responsivity. The current study includes 89 adults (39 with MDD, 47 non-depressed) who were well-characterized in terms of their diagnostic and symptom profiles, and who participated in a laboratory stress challenge (the Trier Social Stress Task; TSST) and a computerized Probabilistic Reward Task (PRT). Our hypothesized mediation model was not supported by the results. However, I did find that blunted reward learning was correlated with blunted stress reactivity. Further, different forms of childhood maltreatment were preferentially associated with different symptoms of anhedonia. Contrary to hypotheses, I also found that within the depressed group, childhood maltreatment, depression severity, and anhedonia were positively correlated with response bias on the PRT. Also contrary to hypotheses, within the depressed group stress reactivity was positively associated with anhedonic symptoms, although these results were not statistically significant. Although our overall model was not supported by the results, my findings suggest that reward responsivity, stress reactivity, and anhedonia remain important research targets in understanding the etiology of MDD. These findings also help to shed light on the negative outcomes associated with childhood maltreatment.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Clinical psychology. $3 649607
655 7 $a Electronic books. $2 local $3 554714
690 $a 0622
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a Queen's University (Canada). $3 1148613
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10671264 $z click for full text (PQDT)