BACKGROUND Apathy is associated with pervasive and disadvantageous effects on daily functioning. It has been observed transiently in some children after surgery for posterior fossa tumors. In this study, our objective was to examine prevalence, associations, and predictors of apathy in adult survivors of an infantile posterior fossa brain tumor (PFT). METHODS One hundred seventeen adult survi...

BACKGROUND Apathy is an important and distressing behavioural symptom in Alzheimer's disease and in various neuropsychiatric disorders. Recently, diagnostic criteria for apathy have been proposed. OBJECTIVES In groups of patients suffering from different neuropsychiatric diseases, (i) to estimate the prevalence of patients meeting the proposed diagnostic criteria; (ii) to estimate the concurr...

The aims of this study were to characterize the presence of apathy in patients with AD, determine the relationship between apathy, motor function and cognitive function, and to verify differences among patients stratified by level of apathy in relation to cognitive and motor abilities. Methods A cross-sectional study was conducted of 37 patients with AD. The following tests were used: MoCA, t...

Apathy is a common but poorly understood condition with a wide societal impact observed in several brain disorders as well as, to some extent, in the normal population. Hence the need for better characterization of the underlying mechanisms. The processes by which individuals decide to attribute physical effort to obtain rewards might be particularly relevant to relate to apathy traits. Here, w...

Apathy is increasingly recognised as a common behavioural syndrome in psychiatric disorders, but it is conceptually ill defined. The aim of this study was to examine the concept of apathy as it is currently used in neurology and psychiatry, by review of the literature and conceptual analysis. There is no consensus on diagnostic criteria for apathy as a syndrome. Apathy is mostly defined as a di...

BACKGROUND AND PURPOSE Apathy is an important neuropsychiatric feature of Parkinson's disease (PD), which often emerges before the onset of motor symptoms. Patients with rapid eye movement sleep behaviour disorder (RBD) have a high probability of developing PD in future. Neuropsychiatric problems are common in RBD, but apathy has not previously been detailed in this key prodromal population. ...

In a clinical context, the term “apathy” refers to a clustering of behavioural and emotional symptoms that manifests as diminished interest and involvement in normal purposeful behaviour, diminished emotional responsiveness, and a lack of initiation and drives to complete nonroutine activities. Apathy may be one of the most common behavioural symptoms of neurodegenerative and other brain disord...

Impairments in executive functioning are commonly found in Parkinson's disease (PD); however, the research into risky decision making has been mixed. The present study sought to investigate three potential hypotheses: difficulty learning the task probabilities, levodopa equivalent dose (LED), and the presence of apathy. Twenty-four individuals with idiopathic PD and 13 healthy controls complete...

Parkinson's disease (PD) is associated with various nonmotor symptoms including neuropsychiatric and cognitive dysfunction. We examined the relation between apathy, anxiety, side of onset of motor symptoms, and cognition in PD. We hypothesized that PD patients would show different neuropsychiatric and neurocognitive profiles depending on the side of onset. 22 nondemented PD patients (11 right-s...

Within the epidemic game literature, there is an inconsistency over whether increases in infection risk can discourage prevention practices. In one theory, investments in social distancing and prophylaxis increase monotonely with infection pressure, while in another, there is a turning-point beyond which investments drop off. To-date, the reasons for this difference have been unclear. This arti...