Limits...
Validation of the Vanderbilt Holistic Face Processing Test

View Article: PubMed Central - PubMed

ABSTRACT

The Vanderbilt Holistic Face Processing Test (VHPT-F) is a new measure of holistic face processing with better psychometric properties relative to prior measures developed for group studies (Richler et al., 2014). In fields where psychologists study individual differences, validation studies are commonplace and the concurrent validity of a new measure is established by comparing it to an older measure with established validity. We follow this approach and test whether the VHPT-F measures the same construct as the composite task, which is group-based measure at the center of the large literature on holistic face processing. In Experiment 1, we found a significant correlation between holistic processing measured in the VHPT-F and the composite task. Although this correlation was small, it was comparable to the correlation between holistic processing measured in the composite task with the same faces, but different target parts (top or bottom), which represents a reasonable upper limit for correlations between the composite task and another measure of holistic processing. These results confirm the validity of the VHPT-F by demonstrating shared variance with another measure of holistic processing based on the same operational definition. These results were replicated in Experiment 2, but only when the demographic profile of our sample matched that of Experiment 1.

No MeSH data available.


Related in: MedlinePlus

(A) Example VHPT-F trials where the top face half is the target. The correct response is the face on the left. On congruent trials, the target part is paired with the distractor as during study. On incongruent trials, the target part is paired with a new distractor part, and the distractor part from the study face is paired with a foil (the task-irrelevant part of the study face is outlined in blue here for illustrative purposes only). (B) Example composite task trials. In these examples, the bottom is the target part and the correct response is “same.” On congruent trials, the target and distractor face halves are associated with the same response (“same” in this example). On incongruent trials, the face halves are associated with different responses (in this example, the bottom half is “same” but the top half is “different”).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5120110&req=5

Figure 1: (A) Example VHPT-F trials where the top face half is the target. The correct response is the face on the left. On congruent trials, the target part is paired with the distractor as during study. On incongruent trials, the target part is paired with a new distractor part, and the distractor part from the study face is paired with a foil (the task-irrelevant part of the study face is outlined in blue here for illustrative purposes only). (B) Example composite task trials. In these examples, the bottom is the target part and the correct response is “same.” On congruent trials, the target and distractor face halves are associated with the same response (“same” in this example). On incongruent trials, the face halves are associated with different responses (in this example, the bottom half is “same” but the top half is “different”).

Mentions: On each trial (see Figure 1A), a study composite face was shown for 2 s followed by a test display with three composite faces. Participants were instructed to select the composite face containing the target part with the same identity (but different image) as the target part in the study composite, while ignoring the rest of the face. The target part was outlined in red at study and test. The correct target part was paired with either the same distractor parts (congruent trials) or different distractor parts (incongruent trial) relative to study (see Figure 1A). There were nine blocks of 20 trials, each with a different target part (top 2/3, bottom 2/3, top half, bottom half, top 1/3, bottom 1/3, eyes, mouth, nose), for a total of 180 trials2. On 116 trials, face composites were created from grayscale male and female faces obtained from the internet. The faces used to create composites on a given trial were either all male or all female. On the remaining 64 trials, face composites were created from grayscale computer-generated faces. Both real and computer-generated trials were used to increase variability in trial types, which benefits reliability. Holistic processing scores are calculated using accuracy for congruent trials minus that for incongruent trials.


Validation of the Vanderbilt Holistic Face Processing Test
(A) Example VHPT-F trials where the top face half is the target. The correct response is the face on the left. On congruent trials, the target part is paired with the distractor as during study. On incongruent trials, the target part is paired with a new distractor part, and the distractor part from the study face is paired with a foil (the task-irrelevant part of the study face is outlined in blue here for illustrative purposes only). (B) Example composite task trials. In these examples, the bottom is the target part and the correct response is “same.” On congruent trials, the target and distractor face halves are associated with the same response (“same” in this example). On incongruent trials, the face halves are associated with different responses (in this example, the bottom half is “same” but the top half is “different”).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5120110&req=5

Figure 1: (A) Example VHPT-F trials where the top face half is the target. The correct response is the face on the left. On congruent trials, the target part is paired with the distractor as during study. On incongruent trials, the target part is paired with a new distractor part, and the distractor part from the study face is paired with a foil (the task-irrelevant part of the study face is outlined in blue here for illustrative purposes only). (B) Example composite task trials. In these examples, the bottom is the target part and the correct response is “same.” On congruent trials, the target and distractor face halves are associated with the same response (“same” in this example). On incongruent trials, the face halves are associated with different responses (in this example, the bottom half is “same” but the top half is “different”).
Mentions: On each trial (see Figure 1A), a study composite face was shown for 2 s followed by a test display with three composite faces. Participants were instructed to select the composite face containing the target part with the same identity (but different image) as the target part in the study composite, while ignoring the rest of the face. The target part was outlined in red at study and test. The correct target part was paired with either the same distractor parts (congruent trials) or different distractor parts (incongruent trial) relative to study (see Figure 1A). There were nine blocks of 20 trials, each with a different target part (top 2/3, bottom 2/3, top half, bottom half, top 1/3, bottom 1/3, eyes, mouth, nose), for a total of 180 trials2. On 116 trials, face composites were created from grayscale male and female faces obtained from the internet. The faces used to create composites on a given trial were either all male or all female. On the remaining 64 trials, face composites were created from grayscale computer-generated faces. Both real and computer-generated trials were used to increase variability in trial types, which benefits reliability. Holistic processing scores are calculated using accuracy for congruent trials minus that for incongruent trials.

View Article: PubMed Central - PubMed

ABSTRACT

The Vanderbilt Holistic Face Processing Test (VHPT-F) is a new measure of holistic face processing with better psychometric properties relative to prior measures developed for group studies (Richler et al., 2014). In fields where psychologists study individual differences, validation studies are commonplace and the concurrent validity of a new measure is established by comparing it to an older measure with established validity. We follow this approach and test whether the VHPT-F measures the same construct as the composite task, which is group-based measure at the center of the large literature on holistic face processing. In Experiment 1, we found a significant correlation between holistic processing measured in the VHPT-F and the composite task. Although this correlation was small, it was comparable to the correlation between holistic processing measured in the composite task with the same faces, but different target parts (top or bottom), which represents a reasonable upper limit for correlations between the composite task and another measure of holistic processing. These results confirm the validity of the VHPT-F by demonstrating shared variance with another measure of holistic processing based on the same operational definition. These results were replicated in Experiment 2, but only when the demographic profile of our sample matched that of Experiment 1.

No MeSH data available.


Related in: MedlinePlus