Visual recognition memory for a sequence of non-verbalized patterns is shown to have a large and clearly defined recency effect. This recency effect occurs with random list lengths and therefore cannot be due to differential processing of the end items. The effect is completely removed by just 3 s of mental arithmetic but survives for at least 10 s over unfilled intervals. Recognition memory for patterns at other serial positions is slower, less accurate, and shows no primacy effect; performance at these earlier serial positions is dependent upon the time for which patterns are initially presented, but is unaffected by the duration of the retention interval, mental arithmetic, and the time between patterns on initial presentation. These findings provide evidence that visual memory has two components that are closely analogous to the short-term (STM) and long-term (LTM) components of verbal memory. Visual STM, here called visualization, has a capacity of one pattern, cannot be activated LTM, and does not seem to be the gateway to LTM.

It is often claimed that visualizing and perceiving interfere with each other because they compete for special purpose visual processing resources. The arguments for this view (e.g. Brooks, 1967, 1968) are criticised. Five experiments are then reported which attempt to determine whether specific processing activities interfere with the visualization of novel abstract patterns. Visualization was greatly interfered with by adding five digits but not by reading them. Presentation modality of the digits did not affect the interference they caused. When the intervening activity involved processing patterns similar to those being visualized, the amount of interference depended upon whether the subject had to form and use representations that outlived the icon. Perception caused interference when it involved formation of a maintainable representation, but not when it required only sensory storage. It is concluded that visualization requires general purpose resources, and that interference between visualization and perception could be due to competition for these resources.

There is conflicting evidence on whether collaborative group work leads to improved classroom relations, and if so how. A before and after design was used to measure the impact on work and play relations of a collaborative learning programme involving 575 students 9-12 years old in single- and mixed-age classes across urban and rural schools. Data were also collected on student interactions and teacher ratings of their group-work skills. Analysis of variance revealed significant gains for both types of relation. Multilevel modelling indicated that better work relations were the product of improving group skills, which offset tensions produced by transactive dialogue, and this effect fed through in turn to play relations. Although before intervention rural children were familiar with each other neither this nor age mix affected outcomes. The results suggest the social benefits of collaborative learning are a separate outcome of group work, rather than being either a pre-condition for, or a direct consequence of successful activity, but that initial training in group skills may serve to enhance these benefits

This article sets out to examine the role of teacher research and enquiry in the professional development of teachers. The context derives from the initiative of the Scottish Executive to enhance the status and working conditions of teachers. We consider the extent to which continuing professional development activities arising out of the Chartered Teacher Programme encourage teachers to value research, equip them to become research-minded and support them to engage in research and enquiry in their own professional contexts.

Contemporary face composite systems require scrutiny of many alternative features during the construction phase and judgments of similarity based on viewing features divorced from a facial context. The role of these two factors in limiting composite production accuracy was assessed in three linked experiments. In Experiment 1, 60 students observed a target face and made similarity judgments on sample eyes or mouths drawn from a Photo-fit Kit before attempting to identify the same features of the target. Experiment 2 was a replication, except that the interpolated judgments were made on the features in the context of a complete Photo-fit face resembling the target. In neither experiment did the Photo-fit components significantly interfere with recognition of the corresponding features of the target. In Experiment 3, the similarity ratings from memory provided by subjects in the previous experiments were compared with parallel sets of ratings furnished by 30 students in the presence of the target. Mean judgments of similarity made from memory on isolated features were discrepant from all other ratings. These results were interpreted as suggesting that, whereas interference is not a major problem, judging resemblance from features seen in isolation may be a serious source of distortion in composite production.Experimental studies of face recall systems developed for police work, like Identikit and Photo-fit, 1 generally show low levels of accuracy and an insensitivity to variables that normally influence recall performance