The effects of valenced feedback in real-time fMRI regulation studies

In real-time fMRI regulation studies, subjects view feedback showing the fluctuating activation within a particular region of their brains as they attempt to regulate that region’s activation. This technology is of theoretical and clinical interest; however, it is unclear whether real-time regulati...

Full description

Bibliographic Details
Main Author: Mann, Heather Elizabeth
Language:English
Published: University of British Columbia 2010
Online Access:http://hdl.handle.net/2429/27642
id ndltd-LACETR-oai-collectionscanada.gc.ca-BVAU.2429-27642
record_format oai_dc
spelling ndltd-LACETR-oai-collectionscanada.gc.ca-BVAU.2429-276422014-03-26T03:37:07Z The effects of valenced feedback in real-time fMRI regulation studies Mann, Heather Elizabeth In real-time fMRI regulation studies, subjects view feedback showing the fluctuating activation within a particular region of their brains as they attempt to regulate that region’s activation. This technology is of theoretical and clinical interest; however, it is unclear whether real-time regulation training is equally effective for all brain regions. Real-time feedback can be positive (if activation is in the desired direction) or negative (if in the opposite direction), suggesting a potential confound for training studies. We reasoned that if particular brain regions are differentially activated according to feedback valence, activations related to feedback might interact with the regulation task. Thus, we designed a study that allowed us to manipulate the valence of feedback in a real-time training context. Subjects were instructed to up-regulate and down-regulate their parahippocampal place area (PPA) in 30-second blocks while in the scanner, viewing feedback which they believed to reflect the activation of this region. In reality, the feedback was pre-constructed, and alternated between positive and negative valence blocks of varying length. Comparing positive with negative feedback, positive feedback activated nucleus accumbens, a reward centre, and certain emotion-relevant regions. Negative feedback produced little consistent activation over positive feedback. In general, feedback effects were greater for moderate feedback than strong feedback, possibly reflecting heightened uncertainty toward moderate feedback. We conclude that feedback-based activations are unlikely to interfere with regulation training for most cortical regions, though emotion-relevant regions may be more sensitive to feedback valence. We also propose that researchers explore feedback methods which emphasize reward-based learning. 2010-08-23T17:52:44Z 2010-08-23T17:52:44Z 2010 2010-08-23T17:52:44Z 2010-11 Electronic Thesis or Dissertation http://hdl.handle.net/2429/27642 eng http://creativecommons.org/licenses/by-nc/3.0/ Attribution-NonCommercial 2.5 Canada University of British Columbia
collection NDLTD
language English
sources NDLTD
description In real-time fMRI regulation studies, subjects view feedback showing the fluctuating activation within a particular region of their brains as they attempt to regulate that region’s activation. This technology is of theoretical and clinical interest; however, it is unclear whether real-time regulation training is equally effective for all brain regions. Real-time feedback can be positive (if activation is in the desired direction) or negative (if in the opposite direction), suggesting a potential confound for training studies. We reasoned that if particular brain regions are differentially activated according to feedback valence, activations related to feedback might interact with the regulation task. Thus, we designed a study that allowed us to manipulate the valence of feedback in a real-time training context. Subjects were instructed to up-regulate and down-regulate their parahippocampal place area (PPA) in 30-second blocks while in the scanner, viewing feedback which they believed to reflect the activation of this region. In reality, the feedback was pre-constructed, and alternated between positive and negative valence blocks of varying length. Comparing positive with negative feedback, positive feedback activated nucleus accumbens, a reward centre, and certain emotion-relevant regions. Negative feedback produced little consistent activation over positive feedback. In general, feedback effects were greater for moderate feedback than strong feedback, possibly reflecting heightened uncertainty toward moderate feedback. We conclude that feedback-based activations are unlikely to interfere with regulation training for most cortical regions, though emotion-relevant regions may be more sensitive to feedback valence. We also propose that researchers explore feedback methods which emphasize reward-based learning.
author Mann, Heather Elizabeth
spellingShingle Mann, Heather Elizabeth
The effects of valenced feedback in real-time fMRI regulation studies
author_facet Mann, Heather Elizabeth
author_sort Mann, Heather Elizabeth
title The effects of valenced feedback in real-time fMRI regulation studies
title_short The effects of valenced feedback in real-time fMRI regulation studies
title_full The effects of valenced feedback in real-time fMRI regulation studies
title_fullStr The effects of valenced feedback in real-time fMRI regulation studies
title_full_unstemmed The effects of valenced feedback in real-time fMRI regulation studies
title_sort effects of valenced feedback in real-time fmri regulation studies
publisher University of British Columbia
publishDate 2010
url http://hdl.handle.net/2429/27642
work_keys_str_mv AT mannheatherelizabeth theeffectsofvalencedfeedbackinrealtimefmriregulationstudies
AT mannheatherelizabeth effectsofvalencedfeedbackinrealtimefmriregulationstudies
_version_ 1716655678522654720