=====Introduction=====
This page contains the images and details of the stimulus presentation for the experiments reported in:

  * DA Kahn, AM Harris, DA Wolk, GK Aguirre. (2010) [[http://www.journalofvision.org/content/10/10/12.abstract |Temporally distinct neural coding of perceptual similarity and prototype bias.]] //Journal of Vision//, 10(10):12, 1-12.

=====Stimulus construction details=====
The face images used were derived from the [[http://www.macbrain.org/resources.htm|NimStim Face Stimulus Set]].

Morphs were created using Gryphon Morph 2.5 in 25% increments between the two endpoint faces.  Resulting faces were cropped using the same 3-pixel feathered elliptical outline in Photoshop and saved as grayscale bitmaps. 

=====Access to stimuli=====

The stimuli may be downloaded as a zipped file of BMP images from our public file repository:

|[[https://cfn.upenn.edu/aguirre/public/stimuli/facesimerp_stimuli.zip|Morphed Faces and Target]]|