Possible primitive notions for geometry of spine spaces

New systems of notions specific to the geometry of spine spaces, are introduced. In particular parallelism turns out to be a sufficient primitive notion to express the geometry of a spine space, and we show that structures related to projective closure are definitionally equivalent to spine spaces.     

Magnitude effect contributes to the domain specificity in delay discounting

Discounting is a useful framework for understanding temporal choices. A person who prefers $50 immediately over $100 in 1 month exhibits a higher discount rate than a person deciding to wait for the higher payoff. Although previous research shows that discount rates are domain-specific, we propose an alternative to the domain specificity account. We suggest that differences in discounting alternatives across various domains may result not so much from the domains' nature per se but from differences in perceived attractiveness of the discounted alternatives. We replicated that an illustrative study evidencing domain specificity in discounting (Experiment 1) showed that people's subjective values of the payoffs in domains discounted in this experiment were different (Experiment 2) and used a novel method to match the attractiveness of the available alternatives across domains (Experiment 3). Finally, Experiment 4 showed that when matching was applied, the domain effect disappeared. We conclude that a magnitude effect can, at least partially, explain domain specificity in delay discounting.     

Perceived tempo change is dependent on base tempo and direction of change: Evidence for a generalized version of Schulze's (1978) internal beat model

Assumptions of a theory, still influential, of tempo perception by Schulze (1978) are reconsidered in view of counter-evidence from other time-perception and timing studies. Specifically, it is shown that the role of base tempo of stimuli and the orientation of tempo change (acceleration versus deceleration) have to be incorporated in them. Therefore, Schulze's assumptions were extended so as to include the two stimulus parameters. A generalized version of Schulze's internal beat model, one of three formal elaborations of the theory, was tested in an experiment which required subjects (N = 17) to tell the direction of change (acceleration or deceleration) in metronomic tone sequences presented at tempi of 1, 2, or 4 Hz, the amount of tempo change being varied in steps of 2% between –10% (acceleration) and + 10%, including zero change. Psychometric curves obtained from logistic regression analysis showed the limitation of the original assumptions and supported the proposed generalization of Schulze's model. The validity of the theoretical interpretation of the data was discussed with respect to some methodological constraints in the experiment, such as the presentation of the different tempo conditions and the time length of the metronomic stimuli used, and with respect to their applicability to the performance of expressive drift (rubato versus accelerando) in music.     

Professionals’ Reflections About the Impact of Digital Technologies on Eating Disorders

The aim of this study was to explore how professionals working with clients who suffer from eating disorders reflect the impact of digital technologies on their clients. Interviews with 30 professionals were conducted. A qualitative analysis revealed the following areas: (a) the attributes of technologies that influence people with eating disorders, (b) the characteristics of people with eating disorders that influence their interaction with digital technologies, (c) the risks of technology usage, and (d) the benefits of technology usage. The results are discussed with respect to the Rodgers’s theoretical model explaining technology–eating disorder relations and the implications for practice.     

Particularity of Content and Illusions of Identity

This paper argues that the accuracy of perceptual experiences cannot be properly characterized by using the particular notion of content without breaking one of the three plausible assumptions. On the other hand, the general notion of content is not threatened by this problem. The first assumption is that all elements of content determine the accuracy conditions of an experience. The second states that objects needed for the accuracy of experiences are physical entities that stand in a perceptual relation to a subject. According to the third assumption, common experiences do not have accuracy conditions that are impossible to satisfy. The above point is demonstrated by analysing illusions of identity in which the number of objects is represented incorrectly. In the concluding parts of the paper, I investigate how an alternative account of particular content can be developed by rejecting the first assumption.     

Spatial navigation deficits in amnestic mild cognitive impairment with neuropsychiatric comorbidity

Aims: To find out whether neuropsychiatric comorbidity (comMCI) influences spatial navigation performance in amnestic mild cognitive impairment (aMCI).

Methods: We recruited aMCI patients with (n = 21) and without (n = 21) neuropsychiatric comorbidity or alcohol abuse, matched for global cognitive impairment and cognitively healthy elderly participants (HE, n = 22). They completed the Mini-Mental State Examination and a virtual Hidden Goal Task in egocentric, allocentric, and delayed recall subtests.

Results: In allocentric navigation, aMCI and comMCI performed significantly worse than HE and similarly to each other. Although aMCI performed significantly worse at egocentric navigation than HE, they performed significantly better than patients with comMCI.

Conclusions: Despite the growing burden of dementia and the prevalence of neuropsychiatric symptoms in the elderly population, comMCI remains under-studied. Since trials often assess “pure” aMCI, we may underestimate patients’ navigation and other deficits. This finding emphasizes the importance of taking account of the cognitive effects of psychiatric disorders in aMCI.     

The structure of audio–visual consciousness

Synthese - It is commonly believed that human perceptual experiences can be, and usually are, multimodal. What is more, a stronger thesis is often proposed that some perceptual multimodal...