The Avon Longitudinal Study of Parents and Children (ALSPAC) assessed their cohort members (CMs) during the study’s age 7.5 sweep (Focus@7) using the Letter Decision Task.
Details on this measure and the data collected from the CMs are outlined in the table below.
| Domain: | Visual scanning |
| Measures: | Visual scanning |
| Visual processing | |
| CHC: | Gs (Processing Speed) |
| Gv (Visual Processing) | |
| Administration method: | Trained interviewer; clinical setting; pen and paper |
| Procedure: | The child was presented with a series of shapes, half of which were real letters, and half which were non-letters (including reversed letters). They were instructed to go through the list, placing a tick next to genuine letters and a cross next to non-letters. The speed of completion was recorded. This test was completed only by children who had struggled with other tasks, and thus the sample is considerably biased. |
| Link to questionnaire: | http://www.bristol.ac.uk/alspac/researchers/our-data/clinical-measures/ (opens in new tab) |
| Scoring: | The main score was the number of correct responses (0 - 40) |
| Item-level variable(s): | Not readily available |
| Total score/derived variable(s): | f7ws300 - f7ws348 |
| Descriptives: | Raw score |
| N = 586 | |
| Range = 0 - 40 | |
| Mean = 34.19 | |
| SD = 5.71 | |
(click image to enlarge) |
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| Age of participants: | Mean = 90.5 months, SD =3.83, Range = 82 - 113 |
| Other sweep and/or cohort: | None |
| Source: | (Gathercole & Baddeley, 1997, personal communication) |
| Technical resources: | None |
| Reference examples: | None |
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 Discovery page.
Go to:
- Overview of all cognitive measures in ALSPAC
- Overview of childhood cognitive measures across all studies
This page is part of CLOSER’s ‘A guide to the cognitive measures in five British birth cohort studies’.