Colour category constancy and the development of colour naming.

In this study, we investigated the processes of coordination, adaptation, and calibration during the development of colour naming and colour constancy, and we tested whether colour term knowledge is related to colour constancy. We measured category membership and prototypes with 163 Munsell chips in preschool children (3- to 4-year-old) under neutral, green, and red illuminations, and compared their results to those of adults. We introduced an index of colour term maturity based on the similarity of children's colour term use to adults, and a colour category constancy index that quantifies the variation in colour categorisation that is specific to illumination changes. Results showed that illumination changes affected children's consistency of colour categorisation, but only to a small extent. However, colour term maturity and illumination-specific effects on consistency strongly varied in this age range. Correlations between colour term maturity and illumination-specific consistency indicated that colour constancy increases with colour term acquisition; but those results depended on the type of illumination changes (between neutral, green, and red). Together, our findings suggest that children progressively fine-tune and recalibrate the meaning of colour terms through processes of coordination and adaptation that are also involved in the calibration of colour constancy.

Frequent users of Mental Health Liaison Services within Emergency Departments.

This study aimed to use nuanced statistical methods in a large UK sample to identify and explore the factors associated with different types of frequent user of Emergency Departments (EDs) who are referred to Mental Health Liaison Services (MHLS). A retrospective 5-year longitudinal study was conducted of all attenders (n = 23,718) of four London EDs who were referred to their MHLS. Longitudinal group-based trajectory analysis of monthly MHLS referrals enabled identification of factors which may contribute to membership of the resulting groups. Analysis revealed six clusters representing distinct attendance patterns; three clusters of these were identified as frequent attender groups (occasional, intermediate, heavy) containing 1119 people (4.7%). This 4.7% of the sample accounted for 24.2% of all admissions. Factors significantly related to membership of each of these groups were: having been involuntarily detained under the Mental Health Act, a higher number of care coordinators, and a diagnosis of substance abuse. The study revealed three clusters of frequent ED users with a MHLS referral who were more likely to have certain clinical and social care needs. A small proportion of clients identified as frequent users (4.7%) were responsible for nearly a quarter of all admissions (24.2%) during this timeframe.

Characteristics of people who rapidly and frequently reattend the emergency department for mental health needs.

OBJECTIVE: This paper identifies the characteristics of emergency department (ED) attendees with a referral to their Mental Health Liaison Service (MHLS) who are at increased risk for rapidly reattending, attending frequently, or attending intensely at this service (which is defined here as rapid and frequent reattendance). METHODS: A retrospective 5-year longitudinal study was conducted of all visitors (n=24 010) attending four busy EDs with a referral to their MHLS from the beginning of 2009 until the end of 2013. A Cox proportional hazards regression was used to identify factors associated with intense use, and a negative binomial regression was used to identify factors associated with frequent attendance. RESULTS: People with certain characteristics were more likely to make 'intense' use of mental health emergency services, which we define as shorter time to reattendance and a higher number of visits over 5 years. The people more likely to make intense use are more likely to have certain clinical diagnoses such as substance misuse, stress disorder, personality disorder and learning disability, to have certain social characteristics such as not being in a relationship, or living alone, and to have healthcare issues such as having been detained under the Mental Health Act and having a greater number of care coordinators over 5 years. CONCLUSION: Individuals with certain clinical and social characteristics were significantly more likely to reattend EDs and have referral to MHLS rapidly and frequently (i.e. intensely).