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The empirical characteristics of human pattern vision defy theoretically-driven expectations.

ABSTRACT: Contrast is the most fundamental property of images. Consequently, any comprehensive model of biological vision must incorporate this attribute and provide a veritable description of its impact on visual perception. Current theoretical and computational models predict that vision should modify its characteristics at low contrast: for example, it should become broader (more lowpass) to protect from noise, as often demonstrated by individual neurons. We find that the opposite is true for human discrimination of elementary image elements: vision becomes sharper, not broader, as contrast approaches threshold levels. Furthermore, it suffers from increased internal variability at low contrast and it transitions from a surprisingly linear regime at high contrast to a markedly nonlinear processing mode in the low-contrast range. These characteristics are hard-wired in that they happen on a single trial without memory or expectation. Overall, the empirical results urge caution when attempting to interpret human vision from the standpoint of optimality and related theoretical constructs. Direct measurements of this phenomenon indicate that the actual constraints derive from intrinsic architectural features, such as the co-existence of complex-cell-like and simple-cell-like components. Small circuits built around these elements can indeed account for the empirical results, but do not appear to operate in a manner that conforms to optimality even approximately. More generally, our results provide a compelling demonstration of how far we still are from securing an adequate computational account of the most basic operations carried out by human vision.

SUBMITTER: Neri P

PROVIDER: S-EPMC6294397 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Project description:BackgroundThere seems to be a consensus that a vision for an organization is a valuable thing for organizations to have. However, research on organizational vision has predominantly been studied from a leadership perspective. In contrast to previous research, organizational vision in this paper takes an employee perspective. Specifically, the purpose is to examine factors associated with the integration of organizational vision among employees in hospital organizations. Consequently, it focuses on a relatively neglected domain within health services research.MethodsA conceptual model, centred on the concept of organizational vision integration, was developed and tested on a sample (N = 1008) consisting of hospital employees. Partial least-squares structural equation modelling (PLS-SEM) was used to test the hypotheses, using SmartPLS 3 software. Furthermore, a bootstrapping test was used to inspect potential mediating effects. Specifically, the test assessed whether the proposed direct and indirect effects were statistically significant, and at the same time revealed the nature of the mediation effect.ResultsThe results from the empirical study reveal three key findings: i) organizational vision integration among employees is directly and positively related to creative performance in their respective work role (β = 0.16). Organizational vision integration and employees' psychological capital explains almost 40% (R2 = 0.36) in employees' creative performance, ii) psychological capital and employees' perception of organizational attractiveness are directly and positively related to employees' organizational vision integration (β = 0.19 and β = 0.40, respectively) and explains about 30% (R2 = 0.29) of employees' organizational vision integration, iii) employees' organizational vision integration mediates the relationship between employees' psychological capital, perception of organizational attractiveness and employees' creative performance.ConclusionsTaking an employee perspective, this study contributes to revealing whether and how organizational vision matters and its impact on hospital employees' work performance. To achieve organizational vision integration among hospital employees successfully, this study shows that it is important for hospital leaders to be aware of the pattern of impact of both personal as well as environmental-related factors.

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The empirical characteristics of human pattern vision defy theoretically-driven expectations.

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