CPT’s Mark Spivak Co-Authors ONR Funded Research Paper Identifying Dog FFA

CPT’s Mark Spivak Co-Authors ONR Funded Research Paper Identifying Dog FFA

CPT’s Mark Spivak, functioning as a research consultant in conjunction with Emory University’s Neuroscience Department, co-authored a fifth research paper published in a prestigious peer reviewed academic journal.  The article, entitled “Awake fMRI Reveals a Specialized Region in Dog Temporal Cortex for Face Processing,” co-authored by Dr. Daniel D. Dilks, PhD, Dr. Peter Cook, PhD, Samuel K Weiller, Helen P. Berns, Mark Spivak, CPT, and Dr. Gregory S. Berns, MD, PhD, describes the existence of a fusiform face area (FFA) within the canine brain.

Canine FFA- DFA

Dogs were trained to station within an individually customized chin rest placed inside a stock human neck coil. Images were rear projected onto a translucent screen placed at the end of the magnet bore. In the dynamic stimuli runs, color movie clips (3-s each) were shown in 21 s blocks of human faces, objects (toys), scenes, and scrambled objects. In the static stimuli runs, black and white images (600 ms on, 400 ms off) were shown in 20 s blocks of human faces, dog faces, everyday objects, scenes, and scrambled faces. The dynamic stimuli runs were used to localize a candidate face region in the temporal cortex of dogs, and then the static stimuli runs were used to independently test the face selectivity of this region.

What is the FFA?

The FFA, which in humans is located in the fusiform gyrus in the ventral surface of the temporal lobe, is responsible for identifying and processing facial visual information.  The FFA is highly relevant to interpersonal communication.  People with damage to the FFA will suffer from a condition called prosopagnosia (face blindness), where the affected person will see faces, but cognitively lack the ability to recognize the faces.

Until the publication of the Emory-CPT paper, the existence of an FFA had never been confirmed in dogs.  Yet, dogs use facial countenance as an important component of dog-dog and dog-human communication.  Moreover, dogs are social pack animals, where identification of faces may be highly relevant to discriminate pack members from interlopers.  Most importantly for practical purposes, knowledge of the canine FFA, its operation, and its activation may lead to improved human-dog communication protocols and improved working and pet dog training methodologies.

Canine FFA- DFA

Error bars indicate the standard error of the mean (n = 6). (A) In DFA, we found a significant category effect (F(3, 24) = 3.79, p = 0.02), with a significantly greater response to images of faces compared to objects, whereas V1 had a similar level of response to all stimulus categories.

 

The Experimental Design

During the experiment, participating animals viewed still and motion pictures of facial and non-facial images while stationary within a 3-Tesla Siemens MRI scanner.  The visual cortex of the animals activated whenever the dogs became attentive to an image.  However, the FFA, dubbed the DFA (Dog Face Area) in the paper, exlusively activated when the dogs observed facial images.  Interestingly, the DFA responded similarly to both human and canine faces, which elucidates how dogs respond brilliantly to human social cues communicated via facial countenance.

Canine FFA- DFA

The DFA was identified by the contrast of faces versus objects during the dynamic stimuli runs. The location of the DFA was localized to the medial bank of the ventrocaudal temporal lobe in 4 of the 6 dogs, with the other 2 localized more laterally.

The Preparatory Process

Although on the surface the preparatory process of teaching the dogs to watch movies may seem very simple, in actuality the experiment required multiple months of training.  First, the dogs needed to become conditioned to the “hostile” variables common to the MRI environment, including the entry steps, the narrow patient table walkway, the narrow enclosure, and the 96 dB noise that encompasses multiple pitches and sequences.  Moreover, the dogs must perform more than a typical down-stay.  The dogs must perform a motionless down-stay, as movement greater than 2 mm within any spatial plane (vertical, horizontal, longitudinal, pitch, yaw) may render the image useless due to noise artifacts.  Next, the dogs had to be conditioned to watch television without human accompaniment, as the experiment required that the dogs remain attentive to the screen for multiple 3-minute blocks.

Canine FFA- DFA

The stimulus was visible for 20 s. The response to objects decayed quickly while the response to faces was sustained.

For those interested in viewing a video of the training process, please link to the CPT Instructional Tips article from January 6, 2015, entitled “MRI Practice: Truffles Practicing for the ‘Danny Faces’ MRI Experiment.”  For those wishing to learn more about the visual ability of dogs to watch televised images, please link to the CPT Tails article, entitled “Lili Learns Not to Bark at Dogs on the TV.”  The prior link scientifically explains the differences between human and canine visual abilities and how the technical evolution of television sets has better enabled dogs to view broadcast images.

Acknowledgements

The Project Team wishes to thank the Office of Naval Research (ONR), which funded the project.  We also wish to thank the human volunteers and their dogs without whose dedication the project would have been impossible:  Cindy Keen (Jack), Patricia King (Kady), Nicole Zitron (Stella), Darlene Coyne (Zen), Marianne Ferraro (Eddie), and Cory and Anna Inman (Tallulah).

(Decatur, GA)

(Sandy Springs, GA)

 

 

 

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