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Affective Liking Influences Reward Processing In Depression: A Computational Eeg Approach, Garima Singh
Affective Liking Influences Reward Processing In Depression: A Computational Eeg Approach, Garima Singh
Psychology ETDs
Reinforcement learning (RL) enables agents to learn through interaction with their environment. This empowers individuals to optimize actions in complex and dynamic settings. The component of event related potential (ERP) termed as the Reward Positivity (RewP) evidently signifies a fundamental reward prediction error (RPE) associated with rewards. This characteristic implies that it represents a fundamental computational process in the assessment of RL. When a reward is particularly pleasurable or liked by an individual, it tends to elicit an amplified RewP signal, reflecting the heightened positive affect. RPE arises from disparities between anticipated and actual rewarding outcomes and is known to …
The Reward Positivity As An Additive And Temporally Independent Event-Related Potential Feature, Trevor C J Jackson
The Reward Positivity As An Additive And Temporally Independent Event-Related Potential Feature, Trevor C J Jackson
Psychology ETDs
The reward positivity (RewP) is a feedback-related event-related potential elicited in response to reward with two distinct defining features. First, it reflects an axiomatic reward prediction error signal. Second, it is spectrally represented within the delta band. We propose a third defining feature, namely that it is an additive and temporally independent event-related potential feature. Across five datasets and ten studies, this dissertation tested three major hypotheses. First, we show that stimulus modality (e.g. visual and auditory stimuli) and parametric delays can shift the RewP in time, which empirically indicates an additive and temporally independent feature. Second, we provide some …
Source Estimation Of The Reward Positivity And Related Resting State Network Activity In Major Depressive Disorder, Christopher J.H. Pirrung
Source Estimation Of The Reward Positivity And Related Resting State Network Activity In Major Depressive Disorder, Christopher J.H. Pirrung
Psychology ETDs
Anhedonia is a complex symptom of Major Depressive Disorder (MDD) that presents itself through multiple behavioral phenotypes of diminished reward processing. In order to better understand this deficit, we aim to look at a marker of reward that is sensitive to information content and valence, the Reward Positivity (RewP). The source of this signal is, however, up for debate. This study used concurrent EEG and MEG to establish the source of the RewP as a distributed network involving ventromedial prefrontal cortex (vmPFC), anterior midcingulate cortex (aMCC), and insulae. Additionally, only vmPFC showed a deficit in MDD. fMRI resting state functional …
The Reward Positivity In Individuals With Alcohol Use Disorder, Garima Singh
The Reward Positivity In Individuals With Alcohol Use Disorder, Garima Singh
Psychology ETDs
The Reward Positivity (RewP) is a positive deflection in the EEG after receiving a reward. Recent evidence suggests that the RewP is modulated by both reward probability aside from affective liking. Here we examined the sensitivity of the RewP to affective and alcohol images in individuals with alcohol use disorder (AUD). We recruited 55 participants (AUD =28, Control= 27). Participants completed an image rating task and a reinforcement learning task with picture feedback (puppy or alcohol images over a green or red screen). Although there was no between group differences in puppy image ratings, there was a significant group difference …