Emo vs id
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Transcript of Emo vs id
a r t i c l e i n f o a b s t r a c tArticle history:Received : 26 October 2010Revised : 15 February 2011Accepted : 17 February 2011Available online : 22 February 2011Keywords : Facial expressions Emotion Working memory fMRI Facial
PURPOSE
using the n-back task to compare neuralresponses during
- an emotional expression WM task - a face identity WM task.
METHODS
- 20 undergraduates (9 female; 18–23 years old, mean age=19.2)
normalno psychiatric medicationreported no significant
neurologicalno psychiatric history
Participants
- informed consent approved by Dartmouth College Committee for the Protection of Human Subjects.- 2 participants were removed
METHODS
- All tasks were performed while participants were in the scanner.
Procedure
- Pilot data
15 participants performed a 2-back 15 participants performed a 3-back
task
EMO
ID
mean accuracy difference=7%
mean accuracy=70%
(mean accuracy=77%mean accuracy difference=11%
METHODS
- Each participant had two runs of 16 practice trials
Procedure
4 SHAPES
First practice run Shape of the image
second practice runcolor of the image
four alternating blocks of EMO and ID trials.
using the n-back task to compare neuralresponses during - an emotional expression WM task - a face identity WM task.
Selected images of four identities - 2 female - 2 male
The NimStim standardized
facial expression
stimulus set
METHODSProcedure
four emotional expressions
- for a total of 16 facesRandomly presented
presented once per block for 2000 ms
followed by a fixation cross that appeared for 500 ms
METHODSProcedure
METHODSBehavioral data analysis
As has been previously described (Wilcox, 1992; Bush et al., 1993), trimming is an effective technique for dealing with outliers.
Therefore, we chose to trim trials for each subject according to a typical trimming threshold of the top 10% and bottom 10% reaction time (RT) values.
http://www.youtube.com/attribution_link?a=0oFh2Rk3cYo&u=%2Fwatch%3Fv%3DL3RkDChaWgU%26feature%3Dshare
METHODSImage acquisition
All subjects were scanned on a 3.0 Tesla Philips Intera Achieva Scanner
Visual stimuli were generated with a Dell laptop computer running E-Prime software
Epson (Model ELP-7000) LCD projector
METHODS
Imaging data analysis
Preprocessing and the general linear model
The fMRI data were analyzed using Statistical Parametric Mapping software (SPM2, Wellcome Department of Imaging Neuroscience, London, UK).None of the subjects had head movement more than 1.5 mm using the Montreal Neurological Institute (MNI)-152 template.
METHODS
Imaging data analysis
Between subjects correlations
predicted that dorsolateral prefrontal cortex (DLPFC) activity would correlate with amygdala EMO
taskwith invariant processing regions (lateral fusiform) during the ID task
ID task
RESULTS
Behavioral results
Accuracy
A task (emotion, identity)×trial (target, non-target) repeated measures ANOVA for accuracy revealed a significant main effect of task (F(1,17)=25.57, p < 0.001),Participants were significantly more accurate for the identity task than the emotion task (p < 0.001).significant task × trial interaction (F(1,17)=5.08, p<0.04)
mean ± standard error: targets: EMO=87.2% ± 2.2, ID=95.3%±1.5; non-targets: EMO=90.9%±1.3,ID=94.4%±1.6;
RESULTS
Behavioral results
Accuracy
Fig. 2. Behavioral results. Behavioral performance (mean±standard error) on the emotion and identity 2-back tasks. Participants were significantly more accurate (A)and faster (B) on the ID task than the EMO task, for all trial types. There was no speed Accuracy tradeoff in performance betweentasks.
DISCUSSION
significant increase in activity in DLPFC
EMO tasks
ID tasks
Working Memory
increased amygdala activity
increased lateral fusiform gyrus activity
supporting working memory for the faces and expressions of
others.
N-back is a kind of mental training intended to expand your working memory (WM), and hopefully your intelligence (IQ1).
http://www.gwern.net/DNB%20FAQ