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.
Years of data collection: | 1998-2000 |
Domain: | Visual scanning |
Measures: | Visual scanning |
Visual processing | |
CHC: | Gs (Processing Speed) |
Gv (Visual Processing) | |
CLOSER Source: | Explore this sweep in CLOSER Discovery: ALSPAC Childhood (5 years to 12 years 11 months) (opens in a new tab) |
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 Explore these variables in CLOSER Discovery: ALSPAC Focus at 7 Clinic Dataset (opens in a new tab) |
Descriptives: | N = 586 |
Range = 0 - 40 | |
Mean = 34.19 | |
SD = 5.71 | |
(click image to enlarge) |
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Age of participants (months): | 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 |
Example articles: | 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’.