Dialogic Book-Sharing intervention in an Italian multicentre randomized controlled trial: effects on parental mood.

The P300 is a type of event-related potential (ERP), characterised by a large positive peak at a latency of 300 msec after the stimulus onset. It can be recorded using a variety of acoustic stimuli, and the P300 elicited using acoustic stimuli is referred to as auditory P300. A wide variety of acoustic stimuli can be used for eliciting the auditory P300, which includes speech stimuli such as vowels, syllables, and words, and non-speech stimuli such as click and tones. The P300 is commonly used as a marker for cognitive functions such as attention, decision making, and memory. Superior cognitive functions are linked to shorter latencies and larger amplitudes of the P300. Conversely, smaller P300 amplitudes are linked to poorer performance on various cognitive tests with different information processing demands. Typically, the P300 is elicited by presenting stimuli in an odd-ball paradigm, however, it can also be elicited by presenting stimuli in the N-back paradigm. The N-back paradigm is commonly used in research settings to assess working memory. Working memory is a type of cognitive function responsible for storing information temporarily and processing of stored information. It plays an important role in the daily lives of individuals for cognitive tasks such as planning, problem-solving, reasoning, learning new skills, and academic performance. Working memory involves two distinct processes, one for maintaining temporary information in a readily accessible state, and another for manipulating the stored information to guide future behavior. Specifically, maintenance encompasses the storage, monitoring, and comparison of information within working memory, while manipulation involves reorganizing and updating the information in memory sets. Several neuroimaging studies have shown that several brain areas are activated during maintenance and manipulation processes of working memory. Veltman et al. reported that very similar areas of the brain are activated during maintenance and manipulation processes. However, Smith et al. have found a difference in the activation pattern in the dorsolateral prefrontal cortex of the brain during maintenance and manipulation processes of working memory. Dixon and De Frias and Lindenberger et al. establish that older adults show greater variability in working memory compared to younger adults. This variation is likely due to the influence of broader cognitive domains such as sustained and executive attention, as well as short- and long-term memory, on the working memory efficiency. The N-back tasks are commonly used to identify the brain areas activated during the maintenance and manipulation process of working memory. This approach involves recording brain activation during zero-back, one-back, and two-back conditions. The difference in brain activity between zero-back and one-back conditions reflects the brain areas activated during the maintenance process of working memory. Similarly, the difference between one-back and two-back conditions reflects brain areas activated during the manipulation process of working memory. The difference between zero-back and two-back conditions shows the brain areas activated during both maintenance and manipulation processes. A similar approach could be used to understand the effect of maintenance and manipulation processes on the P300.