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Investigating the neural response to
   neutral, happy and sad facial
expressions in a ‘Face in the Crowd’
                task
              Mantas Bolys
            Marta Kaczmarczyk
             Rebecca Brewer
               Kate Rowley
                Lena Stroh
Threat detection theory- potential threats in the environment have a
clear adaptive value and are biologically hard-wired.
Angry faces ‘pop-out’ faster among neutral and happy faces.
How about sad faces?

                             Hypotheses
     Does amygdala activation differ for the presentation of
     target and non-target emotional stimuli?
     Does amygdala activation differ for the type of emotion?
     Does HBR differ for male and female faces?




                  Non-target                   Target
Experimental setup
    Mixed design (72 seconds of face task followed by
    16 seconds of fixation). Example of face task block:


                                                             ISI randomly
                                                              distributed
                                                           between 4000 ms
Stimulus presentation                                        and 6000 ms
     (2000 ms)
                                     Two-forced choice
                                        paradigm
                                        (1000 ms)


Task: detect whether all the faces are the same or one of them is different
Following each 72 second face task block (9 trials) will be a 16 seconds baseline block of
fixation. Total length: 18 sessions* (72+16)= approx. 26 min
216 facial arrays; faces are randomly allocated to one of the 9 positions
Scanning Details:
• 2 healthy participants
• 32-channel head coil
• 1.5T fMRI scanner
Brain coverage:
• Whole & ROI: Visual cortex (e.g. middle occipital gyrus) and
   Emotion region (bilateral amygdala activation)
Analyses:
• GLM in SPM8
Predictions:
• Amygdala activity will increase in face task blocks compared to
   fixation blocks
• Stronger amygdala activation to targets than non-targets
• Sad faces will evoke greater amygdala activation

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Investigating neural correlates of emotional faces in the face-in-the-crowd paradigm

  • 1. Investigating the neural response to neutral, happy and sad facial expressions in a ‘Face in the Crowd’ task Mantas Bolys Marta Kaczmarczyk Rebecca Brewer Kate Rowley Lena Stroh
  • 2. Threat detection theory- potential threats in the environment have a clear adaptive value and are biologically hard-wired. Angry faces ‘pop-out’ faster among neutral and happy faces. How about sad faces? Hypotheses Does amygdala activation differ for the presentation of target and non-target emotional stimuli? Does amygdala activation differ for the type of emotion? Does HBR differ for male and female faces? Non-target Target
  • 3. Experimental setup Mixed design (72 seconds of face task followed by 16 seconds of fixation). Example of face task block: ISI randomly distributed between 4000 ms Stimulus presentation and 6000 ms (2000 ms) Two-forced choice paradigm (1000 ms) Task: detect whether all the faces are the same or one of them is different Following each 72 second face task block (9 trials) will be a 16 seconds baseline block of fixation. Total length: 18 sessions* (72+16)= approx. 26 min 216 facial arrays; faces are randomly allocated to one of the 9 positions
  • 4. Scanning Details: • 2 healthy participants • 32-channel head coil • 1.5T fMRI scanner Brain coverage: • Whole & ROI: Visual cortex (e.g. middle occipital gyrus) and Emotion region (bilateral amygdala activation) Analyses: • GLM in SPM8 Predictions: • Amygdala activity will increase in face task blocks compared to fixation blocks • Stronger amygdala activation to targets than non-targets • Sad faces will evoke greater amygdala activation

Editor's Notes

  1. We wanted to investigate whether different emotional expression evoke different neural responses.