Monday, March 23, 2015

Remediating developmental prosopagnosia

What do Oliver Sacks and Carl Kruszelnicki have in common? Developmental prosopagnosia - both of them admit to marked difficulty in recognizing faces.

I've recently had a look into the issue of remediation of  prosopagnosia and while it appears that acquired prosopagnosia is difficult to treat, developmental prosopagnosia is much easier to remedy. There is interesting article in on-line Brain:

DeGutis, J., Cohan S., Ken Nakayama, Ken (2014).  Holistic face training enhances face processing in developmental prosopagnosia. Brain.
Prosopagnosia has largely been regarded as an untreatable disorder. However, recent case studies using cognitive training have shown that it is possible to enhance face recognition abilities in individuals with developmental prosopagnosia. Our goal was to determine if this approach could be effective in a larger population of developmental prosopagnosics. We trained 24 developmental prosopagnosics using a 3-week online face-training program targeting holistic face processing. Twelve subjects with developmental prosopagnosia were assessed before and after training, and the other 12 were assessed before and after a waiting period, they then performed the training, and were then assessed again. The assessments included measures of front-view face discrimination, face discrimination with view-point changes, measures of holistic face processing, and a 5-day diary to quantify potential real-world improvements. Compared with the waiting period, developmental prosopagnosics showed moderate but significant overall training-related improvements on measures of front-view face discrimination. Those who reached the more difficult levels of training (‘better’ trainees) showed the strongest improvements in front-view face discrimination and showed significantly increased holistic face processing to the point of being similar to that of unimpaired control subjects. Despite challenges in characterizing developmental prosopagnosics’ everyday face recognition and potential biases in self-report, results also showed modest but consistent self-reported diary improvements. In summary, we demonstrate that by using cognitive training that targets holistic processing, it is possible to enhance face perception across a group of developmental prosopagnosics and further suggest that those who improved the most on the training task received the greatest benefits.

Full text: http://brain.oxfordjournals.org/content/early/2014/03/29/brain.awu062

The following links were also interesting:

http://www.faceblind.org/links/FacetoFaceNewsletter-Winter2014.pdf
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4122168/

In practice, I know of two commercial programs that could be used:

1. FaceSay - which retrains face recognition, emotion recognition and following gaze - aimed at helping  autistic kids (has some research proving that it improves behaviour in the playground)
2. A subtest of BrainHQ called Recognition that could be used for training for adults and potentially non-autistic children.

cheers,
Izabela

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