scholarly journals The 20-item prosopagnosia index (PI20): a self-report instrument for identifying developmental prosopagnosia

2015 ◽  
Vol 2 (6) ◽  
pp. 140343 ◽  
Author(s):  
Punit Shah ◽  
Anne Gaule ◽  
Sophie Sowden ◽  
Geoffrey Bird ◽  
Richard Cook
Keyword(s):  
Face Recognition ◽  
Self Report ◽  
New Instrument ◽  
Recognition Ability ◽  
Unfamiliar Face ◽  
Computer Based ◽  
Objective Tests ◽  
And Performance ◽  
Reliable Classification ◽  
Perceptual Impairment

Self-report plays a key role in the identification of developmental prosopagnosia (DP), providing complementary evidence to computer-based tests of face recognition ability, aiding interpretation of scores. However, the lack of standardized self-report instruments has contributed to heterogeneous reporting standards for self-report evidence in DP research. The lack of standardization prevents comparison across samples and limits investigation of the relationship between objective tests of face processing and self-report measures. To address these issues, this paper introduces the PI20; a 20-item self-report measure for quantifying prosopagnosic traits. The new instrument successfully distinguishes suspected prosopagnosics from typically developed adults. Strong correlations were also observed between PI20 scores and performance on objective tests of familiar and unfamiliar face recognition ability, confirming that people have the necessary insight into their own face recognition ability required by a self-report instrument. Importantly, PI20 scores did not correlate with recognition of non-face objects, indicating that the instrument measures face recognition, and not a general perceptual impairment. These results suggest that the PI20 can play a valuable role in identifying DP. A freely available self-report instrument will permit more effective description of self-report diagnostic evidence, thereby facilitating greater comparison of prosopagnosic samples, and more reliable classification.

scholarly journals The Twenty Item Prosopagnosia Index (PI20) provides meaningful evidence of face recognition impairment

2021 ◽  
Vol 8 (11) ◽  
Author(s):  
Maria Tsantani ◽  
Tim Vestner ◽  
Richard Cook
Keyword(s):  
Face Recognition ◽  
Recognition Accuracy ◽  
Self Report ◽  
Objective Measures ◽  
Recognition Ability ◽  
Considerable Debate ◽  
Computer Based ◽  
Typical Range ◽  
Insight Into ◽  
Intended Use

The Twenty Item Prosopagnosia Index (PI20) is a self-report questionnaire used for quantifying prosopagnosic traits. This scale is intended to help researchers identify cases of developmental prosopagnosia by providing standardized self-report evidence to complement diagnostic evidence obtained from objective computer-based tasks. In order to respond appropriately to items, prosopagnosics must have some insight that their face recognition is well below average, while non-prosopagnosics need to understand that their relative face recognition ability falls within the typical range. There has been considerable debate about whether participants have the necessary insight into their face recognition abilities to respond appropriately. In the present study, we sought to determine whether the PI20 provides meaningful evidence of face recognition impairment. In keeping with the intended use of the instrument, we used PI20 scores to identify two groups: high-PI20 scorers (those with self-reported face recognition difficulties) and low-PI20 scorers (those with no self-reported face recognition difficulties). We found that participant groups distinguished on the basis of PI20 scores clearly differed in terms of their mean performance on objective measures of face recognition ability. We also found that high-PI20 scorers were more likely to achieve levels of face recognition accuracy associated with developmental prosopagnosia.

scholarly journals Robust associations between the 20-item prosopagnosia index and the Cambridge Face Memory Test in the general population

2017 ◽  
Vol 4 (3) ◽  
pp. 160923 ◽  
Author(s):  
Katie L. H. Gray ◽  
Geoffrey Bird ◽  
Richard Cook
Keyword(s):  
Face Recognition ◽  
General Population ◽  
Validation Study ◽  
Memory Test ◽  
Self Report ◽  
Face Memory ◽  
Formal Testing ◽  
And Performance ◽  
Insight Into ◽  
Report Measure

Developmental prosopagnosia (DP) is a neurodevelopmental condition, characterized by lifelong face recognition deficits. Leading research groups diagnose the condition using complementary computer-based tasks and self-report measures. In an attempt to standardize the reporting of self-report evidence, we recently developed the 20-item prosopagnosia index (PI20), a short questionnaire measure of prosopagnosic traits suitable for screening adult samples for DP. Strong correlations between scores on the PI20 and performance on the Cambridge Face Memory Test (CFMT) appeared to confirm that individuals possess sufficient insight into their face recognition ability to complete a self-report measure of prosopagnosic traits. However, the extent to which people have insight into their face recognition abilities remains contentious. A lingering concern is that feedback from formal testing, received prior to administration of the PI20, may have augmented the self-insight of some respondents in the original validation study. To determine whether the significant correlation with the CFMT was an artefact of previously delivered feedback, we sought to replicate the validation study in individuals with no history of formal testing. We report highly significant correlations in two independent samples drawn from the general population, confirming: (i) that a significant relationship exists between PI20 scores and performance on the CFMT, and (ii) that this is not dependent on the inclusion of individuals who have previously received feedback. These findings support the view that people have sufficient insight into their face recognition abilities to complete a self-report measure of prosopagnosic traits.

scholarly journals The Goldsmiths Unfamiliar Face Memory and Before They Were Adult Tests

2020 ◽  
Author(s):  
Ashok Jansari ◽  
E. Green ◽  
Francesco Innocenti ◽  
Diego Nardi ◽  
Elena Belanova ◽  
...  
Keyword(s):  
Face Recognition ◽  
Holistic Processing ◽  
Face Identification ◽  
Facial Features ◽  
Face Memory ◽  
Face Matching ◽  
Recognition Ability ◽  
Unfamiliar Face ◽  
The Continuum

Unfamiliar face identification ability varies widely in the population. Those at the extreme top and bottom ends of the continuum have been labelled super-recognisers and prosopagnosics, respectively. Here we describe the development of two new tests - the Goldsmiths Unfamiliar Face Memory Test (GUFMT) and the Before They Were Adult Test (BTWA), that have been designed to measure different aspects of face identity ability across the spectrum. The GUFMT is a test of face memory, the BTWA a test of simultaneous adult-to-child face matching. Their designs draw on theories suggesting face identification is achieved by the recognition of facial features, the consistency across time of configurations between those features, and holistic processing of faces as a Gestalt. In four phases, participants (n = 16737), recruited using different methods, allowed evaluations to drive GUFMT development, the creation of likely population norms, as well as correlations with established face recognition tests. Recommendations for criteria for classification of super-recognition ability are also made.

Associations between self-reported and actual face recognition abilities are only evident in above- and below-average recognisers

2020 ◽  
Author(s):  
Alejandro Estudillo ◽  
Wong Hoo Keat
Keyword(s):  
Face Recognition ◽  
Individual Differences ◽  
Recognition Performance ◽  
Negative Association ◽  
Memory Test ◽  
Self Report ◽  
Recognition Ability ◽  
General Studies ◽  
Typical Range ◽  
Report Measure

The 20-Item Prosopagnosia Items (PI-20) was recently introduced as a self-report measure of face recognition abilities and as an instrument to help the diagnosis of prosopagnosia. In general, studies using this questionnaire have shown that observers have moderate to strong insights into their face recognition abilities. However, it remains unknown whether these insights are equivalent for the whole range of face recognition abilities. The present study investigates this issue using the Mandarin version of the PI-20 and the Cambridge Face Memory Test Chinese (CFMT-Chinese). Our results showed a moderate negative association between the PI-20 and the CFMT-Chinese. However, this association was driven by people with low and high face recognition ability, but absent in people within the typical range of face recognition performance. The implications of these results for the study of individual differences and the diagnosis of prosopagnosia are discussed.

scholarly journals Associations between self-reported and objective face recognition abilities are only evident in above- and below-average recognisers

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10629
Author(s):  
Alejandro J. Estudillo ◽  
Hoo Keat Wong
Keyword(s):  
Face Recognition ◽  
Individual Differences ◽  
Recognition Performance ◽  
Negative Association ◽  
Memory Test ◽  
Self Report ◽  
Recognition Ability ◽  
General Studies ◽  
Typical Range ◽  
Report Measure

The 20-Item Prosopagnosia Items (PI-20) was recently introduced as a self-report measure of face recognition abilities and as an instrument to help the diagnosis of prosopagnosia. In general, studies using this questionnaire have shown that observers have moderate to strong insights into their face recognition abilities. However, it remains unknown whether these insights are equivalent for the whole range of face recognition abilities. The present study investigates this issue using the Mandarin version of the PI-20 and the Cambridge Face Memory Test Chinese (CFMT-Chinese). Our results showed a moderate negative association between the PI-20 and the CFMT-Chinese. However, this association was driven by people with low and high face recognition ability, but absent in people within the typical range of face recognition performance. The implications of these results for the study of individual differences and the diagnosis of prosopagnosia are discussed.

scholarly journals Facing the facts: Naive participants have only moderate insight into their face recognition and face perception abilities

2018 ◽  
Vol 72 (4) ◽  
pp. 872-881 ◽  
Author(s):  
Anna K Bobak ◽  
Viktoria R Mileva ◽  
Peter JB Hancock
Keyword(s):  
Face Recognition ◽  
Principal Component ◽  
Self Report ◽  
Valuable Contribution ◽  
Object Processing ◽  
Recognition Ability ◽  
Large Populations ◽  
With Memory ◽  
Insight Into ◽  
Report Measure

A reliable self-report measure to assess the broad spectrum of face recognition ability (FRA) from developmental prosopagnosia (DP) to super-recognition would make a valuable contribution to initial screening of large populations. We examined the performance of 96 naive participants and seven super-recognisers (SRs) using a range of face and object processing tasks and a newly developed 20-item questionnaire, the Stirling Face Recognition Scale (SFRS). Overall, our findings suggest that young adults have only moderate insight into their FRA, but those who have been previously informed of their (exceptional) performance, the SRs, estimate their FRA accurately. Principal component analysis of SFRS yielded two components. One loads on questions about low ability and correlates with perceptual tasks, and one loads on questions about high FRA and correlates with memory for faces. We recommend that self-report measures of FRA should be used in addition to behavioural testing, to allow for cross-study comparisons, until new, more reliable instruments of self-report are developed. However, self-report measures should not be solely relied upon to identify highly skilled individuals. Implications of these results for theory and applied practice are discussed.

scholarly journals Intrinsic equivalence between developmental prosopagnosia questionnaires

2018 ◽  
Author(s):  
Daisuke Matsuyoshi ◽  
Katsumi Watanabe
Keyword(s):  
Face Recognition ◽  
High Reliability ◽  
Recognition Performance ◽  
Large Population ◽  
Principal Component ◽  
Cost Effective ◽  
Self Report ◽  
Effective Measure ◽  
Recognition Ability ◽  
Relationship Of

AbstractThe 20-item prosopagnosia index (PI20) is a self-report measure of face recognition ability, which is aimed to assess the risk for developmental prosopagnosia (DP), developed by Shah, Gaule, Sowden, Bird, and Cook (2015). Although they validated PI20 in several ways and it may serve as a quick and cost-effective measure for estimating DP risk (Livingston & Shah, in press; Shah et al., 2015), they did not formally evaluate its validity against a pre-existing alternative questionnaire (Kennerknecht et al., 2008) even though they criticized the weak relationship of the pre-existing questionnaire to actual behavioral face recognition performance. Thus, we administered the questionnaires to a large population (N = 855) and found a very strong correlation (r = 0.82 [95% confidence interval: 0.80, 0.84]), a principal component that accounted for more than 90% of the variance, and comparable reliability between the questionnaires. These results show unidimensionality and equivalence between the two questionnaires, or at least, a very strong common latent factor underlying them. The PI20 may not be greater than the pre-existing questionnaire; the two questionnaires measured essentially the same trait. The intrinsic equivalence between the questionnaires necessitates a revision of the view that the PI20 overcomes the weakness of the pre-existing questionnaire. Because both questionnaires contained unreliable items, we suggest, instead of using either questionnaire alone, that selection of a set of items with high reliability may offer a more robust approach to capture face recognition ability.

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