Infants Organise Visual Information By Four Months, April 23, 2006
Research investigating attention in infancy has revealed that, at just four months old, babies are able to organise visual information in at least three different ways, according to brightness, shape, and how close the visual elements are together (proximity). These new findings mean that very young infants are much more capable of organising their visual world than psychologists had previously thought. The study also has implications for understanding certain developmental disorders such as Williams syndrome.
The findings emerged from Economic and Social Research Council funded research investigating different styles of visual attention in babies from the age of two to eight months. Paying attention to visual stimuli is important in the development of object recognition, and is also needed for the development of memory, motor skills and other key abilities. Led by psychologists Dr Emily Farran at the University of Reading and Dr Janice Brown at London South Bank University, the initial aim of the research was to investigate the underlying reasons why some babies are 'short-lookers' and shift visual attention rapidly, while others are 'long-lookers' who keep their attention fixed for longer.
Previously, these categories were thought to be relatively stable traits indicative of individual differences, with links to later cognitive development. However, the research revealed that babies often move between these two categories over the timescale studied. "The literature talks about the short-looking and long-looking categories, and links to later abilities are suggested. Unusually, we looked at this longitudinally, so we were able to pick up that these categories weren't stable" says Dr Farran. "So these differences can't be indicative of differential brain development, or predictive of later abilities."
Some of the research was designed to test whether infants are able to organise visual stimuli into groups based on similar attributes: brightness, shape, and proximity. To take part in the visual grouping experiments, each baby was placed in a car seat facing a screen onto which images were projected. Overhead cameras recorded how long each infant looked at images on the screen. The infants were shown an array where the stimuli were arranged by similarity in either horizontal lines or vertical columns. For example, for grouping by shape, an array of horizontal lines (or vertical columns) made up of squares and circles was used, constructed so that shape discrimination would be needed to 'see' lines or columns in the array. To test if visual grouping had occurred, images of plain bars of horizontal lines and vertical columns were then shown. If the infants looked for a longer time at either the line or column bars on average, this would indicate an effect of the earlier lines or columns made up of squares and circles, indicating grouping.
The results showed that grouping by brightness emerges first: it was observed at two months, in line with previous observations that this ability is present in newborn babies. At four months, two further grouping abilities emerged: grouping by shape and by proximity. Proximity grouping had not been tested in infants prior to this research, and grouping by shape had previously been seen only at six or seven months.
Dr Farran argues that it's important to understand the development of low-level processes such as attention from early on in order to understand how higher-level processes such as object recognition -- which requires grouping by several different visual characteristics -- develop.
