ALSPAC - Age 24 - Predictive Processing Task
The Avon Longitudinal Study of Parents and Children (ALSPAC) assessed their cohort members (CMs) during the study’s age 24 sweep (Focus at 24) using a measure of Wechsler Intelligence Scale for Children (WISC-III) Digit Symbol Coding.
Details on this measure and the data collected from the CMs are outlined in the table below.
| Year of data collection: | 2015-2017 |
| Domain: | Verbal and non-verbal ability |
| Measures: | Information processing |
| CHC: | N/A |
| CLOSER Source: | Explore this sweep in CLOSER Discovery: ALSPAC Early Adulthood (19 years – 30 years 11 months) (opens in a new tab) |
| Administration method: | Computer-Assisted Personal Interview (CAPI) |
| Procedure: | The Predictive Processing task is a computer-assisted task scheduled to last 20 minutes that participants completed on their own in the computer room. Beforehand, a fieldworker explained the task and the participant was then able to practice the task before completing the actual task on their own. The task involved participants viewing two-tone black and white images and was split into three blocks. |
| In the first ‘before’ block, participants were presented with a series of 10 two-tone black-and-white images and were asked whether they could see an animal/person in the image. They were then presented with the same two-tone image but with a red dot on it and asked whether the red dot was in the background or was on the person/animal. In the second ‘template’ block, individuals were presented with colour photos of the images from the ‘before’ block. Finally, in the third ‘after’ block, participants were again presented with the two-tone black-and-white images, and asked whether, after seeing the colour version of the image, an animal/person was in the image and whether a red dot was on the animal/person or in the background. | |
| Link to questionnaire: | http://www.bristol.ac.uk/alspac/researchers/our-data/clinical-measures/ (opens in a new tab) |
| Scoring: | None available |
| Item-level variable(s): | Not readily available |
| Total score/derived variable(s): | FKPP1000 – FKPP1350 |
| Descriptives: | N = 3,654 |
| Age of participants (months): | Mean = 293.81 months, SD = 9.779, Range = 268.5 – 318.5 |
| Other sweep and/or cohort: | None |
| Source: | Teufel, C., Subramaniam, N., Dobler, V., Perez, J., Finnemann, J., Mehta, P. R., … & Fletcher, P. C. (2015). Shift toward prior knowledge confers a perceptual advantage in early psychosis and psychosis-prone healthy individuals. Proceedings of the National Academy of Sciences, 112(43), 13401-13406. |
| Technical resources: | Kingdom, F., & Prins, N. (2009). Psychophysics: A Practical Introduction. Amsterdam: Elsevier. |
| Macmillan, N. A., & Creelman, C. D. (2005). Detection theory: a user’s guide (2nd ed.). Mahwah, New Jersey: Lawrence Erbaum Associates. | |
| Example articles: | Unknown |
For the named items in the table above, links are provided to their corresponding content on CLOSER Discovery. Where a variable range is provided, full variable lists can be accessed through the ‘Variable Groups’ tab on the linked CLOSER Discovery page.