Brain activation in response to caricatures blake reitz alex lehmicke university of wisconsin stout
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Introduction Caricatures can be found in all forms of media. PowerPoint PPT Presentation


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Brain Activation in Response to Caricatures Blake Reitz & Alex Lehmicke University of Wisconsin-Stout. Introduction Caricatures can be found in all forms of media.

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Brain activation in response to caricatures blake reitz alex lehmicke university of wisconsin stout

Brain Activation in Response to Caricatures Blake Reitz & Alex Lehmicke University of Wisconsin-Stout

  • Introduction

  • Caricatures can be found in all forms of media.

  • Mauro & Kubovy found that caricatures (AKA “Super-Portraits”) were encoded quicker than real faces in same/different reaction tests.

  • N170 – ERP in the Fusiform Face Area (FFA) related to face processing

  • Left brain – “Part-based processing”

  • Right brain – “Holistic processing”

  • Do caricatures map more accurately to the brain then real faces?

  • Do they take less effort to process?

  • Hypothesis

  • The Temporal Lobes (T5 & T6) will show stronger activation for caricatures over real faces.

  • The Parietal Lobe (Pz) will show quicker N170 activation for caricatures over real faces.

Sample Faces

  • Pilot Study Results

Mean EEG – Parietal, T5, T6

  • Arrows denotes N170 ERP

  • Caricatures showed quicker Pz activation than real faces

Real Faces vs. Caricatures – Parietal

  • Blue Arrow shows increasing Pz activation in the 400+ millisecond range.

  • Area tied to novelty

  • Greater for caricatures

Scott McCloud’s scale of realism in characterized faces

Real Faces vs. Caricatures – Left Temporal

  • Pz activation at 250 milliseconds for real faces

  • Pz is inverted, as it is located above the primary visual cortex

  • Materials & Methods

  • EEG were recorded using the 64-channel HydroCel Geodesic Sensor Net

  • Each face was followed by a rest period

  • During the rest period, there was an on-screen questionnaire on the familiarity of the face.

  • Pictures were controlled for color and contrast.

  • Familiarity was controlled for by using pictures of well-known male celebrities.

Sample Caricature and photograph used in pilot study

  • Conclusions

  • This study is currently ongoing.

  • The initial data supports half of our hypothesis.

  • -There is evidence that caricatures are processed quicker than real faces.

  • -There was little significant variation found in the left and right temporal lobes.

  • The pilot study suggests that the caricatures and real faces were not processed differently in each hemisphere of the brain, but are processed differently overall.

  • Our study supports Mauro and Kubovy’s hypothesis from a psychophysical perspective, future studies might find further evidence in support of the “super-portrait” hypothesis.

  • Participants viewed 80 faces

  • 20 real faces

  • 20 caricatures

  • Each face was viewed twice

  • Each face was seen for one second

Real Faces vs. Caricatures – Right Temporal

  • Real faces activated slightly quicker in T5 & T6

  • Caricatures showed stronger activation in T5 and T6 than real faces

  • Pilot Study notes:

  • EEG was recorded from five subjects from the three locations using Biopac.

  • Participants observed sixty faces (two sets of 15 real faces and 15 caricatures).

Acknowledgments

Thanks to Doctors Desiree Budd, Mike Donnelly, and Peizong Li

Literature cited

Mauro, R. & Kubovy, M. (1992)

Caricature and face recognition.


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