One Third of Fake Images Go Undetected

Summary: A new study reveals people fail to spot almost one third of manipulated, or fake, images shown to them. Researchers say that, with the technology to easily falsify images so readily available, people must be more vigilant when viewing images used by the media or in court settings.

Source: University of Warwick.

Around one third of fake images went undetected in a recent study by the University of Warwick, UK.

New research, led by Sophie Nightingale from the Department of Psychology, found that when people were faced with manipulated images of real-world scenes, they failed to spot around thirty-five percent of them.

659 people aged 13-70 were asked to view a set of images of ordinary scenes – such as a man standing in a residential street, or a woman posing next to a canal – taken by the researchers.

The researchers digitally altered the photographs in subtle, plausible ways, including: airbrushing (clearing faces of imperfections, such as whitening teeth); addition or subtraction of items (for example, a bin appears on the street scene which wasn’t actually there).

There were also some implausible changes, such as shadows being manipulated.

Observing a variety of the original and edited images, the participants were asked “do you think this photograph has been digitally altered?”

Just over half (58%) of the original, unaltered images were correctly identified – and only 65% of the photographs which had been manipulated were spotted.

Chance performance on this task was 50% – so the results are not very much above what the participants would have achieved had they chosen entirely randomly.

Even if the participants thought that an image wasn’t altered, the researchers asked them if they could locate an area of the picture that might have been manipulated.

In this task, 56% of the manipulations were correctly located, even after some participants had incorrectly thought an altered image was an unedited original – demonstrating that if we take longer to try to identify potential fakes, even if it is subtle and barely visible, we may spot it.

However, even when participants said that they thought a photo had been altered, some of them couldn’t locate the manipulation on the image.

The research suggests that people in general have an extremely limited ability to detect and locate manipulations of real-world scenes.

Demographic (age and gender) didn’t make a difference with the results – a warning that we are all potentially susceptible to falling for a faked image.

unaltered image of man in street.

Original image of man in street. NeuroscienceNews.com image is credited to Sophie Nightingale/University of Warwick.

In the digital age, where photo editing is easy and accessible to everyone, this research raises questions about how vigilant we must be before we can trust a picture’s authenticity.

Airbrushed models in magazines and advertising campaigns – and even filtered images on social media – can cause insecurity, leading to poor levels of mental health and wellbeing in people who do not recognise that they are looking at edited images of unreal levels of beauty.

Furthermore, it is crucial that images used as evidence in courts – and those used in journalism – are better monitored, to ensure they are accurate and truthful, as faked images in these contexts could lead to dire consequences and miscarriages of justice.

a man in the street

Manipulated image of man in street. NeuroscienceNews image is credited to Sophie Nightingale/University of Warwick.

Sophie Nightingale comments:

“When people look at newspapers or magazines, or go on the internet, they’re going to be exposed to fake images, yet our research has shown that people are quite unlikely to distinguish between the real and the fake.

“So the challenge now is to try and find ways to help people improve at this task. For instance, fake images often contain tell-tale signs that they have been manipulated, and we’re conducting new research to see whether people can make use of these signs to help identify forgeries.”

About this neuroscience research article

The research, ‘Can people identify original and manipulated photos of real-world scenes?’ is published in Cognitive Research: Principles and Implications. It is co-authored by Kimberley A. Wade and Derrick G. Watson.

Funding: Funding provided by Economic and Social Research Council.

Source: Luke Walton – University of Warwick
Image Source: NeuroscienceNews.com images are credited to Sophie Nightingale/University of Warwick.
Original Research: Full open access research for “Can people identify original and manipulated photos of real-world scenes?” by Sophie J. Nightingale, Kimberley A. Wade and Derrick G. Watson in Cognitive Research: Principles and Implications. Published online July 18 2017 doi:10.1186/s41235-017-0067-2

Cite This NeuroscienceNews.com Article
University of Warwick “One Third of Fake Images Go Undetected.” NeuroscienceNews. NeuroscienceNews, 18 July 2017.
<http://neurosciencenews.com/fake-images-psychology-7107/>.
University of Warwick (2017, July 18). One Third of Fake Images Go Undetected. NeuroscienceNew. Retrieved July 18, 2017 from http://neurosciencenews.com/fake-images-psychology-7107/
University of Warwick “One Third of Fake Images Go Undetected.” http://neurosciencenews.com/fake-images-psychology-7107/ (accessed July 18, 2017).

Abstract

Can people identify original and manipulated photos of real-world scenes?

Advances in digital technology mean that the creation of visually compelling photographic fakes is growing at an incredible speed. The prevalence of manipulated photos in our everyday lives invites an important, yet largely unanswered, question: Can people detect photo forgeries? Previous research using simple computer-generated stimuli suggests people are poor at detecting geometrical inconsistencies within a scene. We do not know, however, whether such limitations also apply to real-world scenes that contain common properties that the human visual system is attuned to processing. In two experiments we asked people to detect and locate manipulations within images of real-world scenes. Subjects demonstrated a limited ability to detect original and manipulated images. Furthermore, across both experiments, even when subjects correctly detected manipulated images, they were often unable to locate the manipulation. People’s ability to detect manipulated images was positively correlated with the extent of disruption to the underlying structure of the pixels in the photo. We also explored whether manipulation type and individual differences were associated with people’s ability to identify manipulations. Taken together, our findings show, for the first time, that people have poor ability to identify whether a real-world image is original or has been manipulated. The results have implications for professionals working with digital images in legal, media, and other domains.

“Can people identify original and manipulated photos of real-world scenes?” by Sophie J. Nightingale, Kimberley A. Wade and Derrick G. Watson in Cognitive Research: Principles and Implications. Published online July 18 2017 doi:10.1186/s41235-017-0067-2

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