The human visual system is more sensitive to symmetry than to repetition. According to the so-called holographic approach [J. Math. Psychol. 35 (1991) 151; Psychol. Rev. 103 (1996) 429; Psychol. Rev. 106 (1999) 622], however, this perceptual difference between symmetry and repetition depends strongly on spatial scaling. This was tested in three experiments, using symmetry and repetition stimuli that consisted of black and white patches, with patch size as the critical variable. In Experiment 1, patch size was increased in the entire pattern, yielding fewer but larger patches (or blobs). This is known to have hardly any effect on symmetry but, as found now, it does have a strengthening effect on repetition. In the second experiment, we increased patch size in subpatterns only, yielding salient blob areas. This again strengthens repetition but, as double-checked in experiment 3, it can weaken symmetry. These results agree with the holographic approach, and enable an integration of computational, algorithmic, and implementational aspects of vision.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/s0042-6989(03)00073-7 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Self-Assembling of Multilayered Polymorphs with Ion Beams.
Nano Lett
January 2025
Department of Physics, Centre for Materials Science and Nanotechnology, University of Oslo, PO Box 1048 Blindern, N-0316 Oslo, Norway.
Polymorphism determines significant variations in materials' properties by lattice symmetry variation. If they are stacked together into multilayers, polymorphs may work as an alternative approach to the sequential deposition of layers with different chemical compositions. However, selective polymorph crystallization during conventional thin film synthesis is not trivial; changes of temperature or pressure when switching from one polymorph to another during synthesis may cause degradation of the structural quality.
View Article and Find Full Text PDFThe use of botulinum toxin to improve cosmesis in patients with facial asymmetry following facial palsy/synkinesis - A literature review.
J Plast Reconstr Aesthet Surg
January 2025
Queens Medical Centre, Nottingham, UK. Electronic address:
Article Synopsis
- Facial palsy (FP) leads to facial paralysis, impairments, and affects appearance, which can impact quality of life and mental health due to issues like social isolation.
- A review of 16 studies from 2010 to 2023 found that botulinum toxin injections are effective in improving facial symmetry and aesthetics for long-term FP management, with benefits lasting around 4 months.
- Although botulinum shows promise for treating FP, especially for long-term effects, more research is needed for its use in acute cases to establish guidelines for timing, dosage, and treatment intervals.
The Single Leg Bridge Test Does Not Measure Isolated Hamstring Endurance in Healthy Men.
Int J Sports Phys Ther
December 2024
Universidade Federal de Ciências da Saúde de Porto Alegre.
Background: The Single Leg Bridge Test (SLBT) is commonly described as a measure of 'hamstring endurance'. Nevertheless, the relationship between the SLBT score and isolated hamstring endurance remains uncertain.
Purpose: This study aimed to investigate the correlation between SLBT scores and isolated hamstring endurance in healthy men.
A fast dynamic causal modeling regression method for fMRI.
Neuroimage
December 2024
School of Electrical and Information Engineering, Yunnan Minzu University, Kunming, 650500, China; Yunnan Provincial Key Laboratory of Unmanned Autonomous Systems, Kunming, 650500, China; Yunnan Provincial Colleges and Universities Intelligent Sensor Network and Information System Technology Innovation Team, Kunming 650504, China.
Dynamic Causal Modeling (DCM) is a crucial tool for studying brain effective connectivity, offering valuable insights into brain network dynamics through functional magnetic resonance imaging (fMRI) and electrophysiology (EEG and MEG). However, its high computational complexity limits its applicability in large-scale network analysis. To address this issue, we propose a regression algorithm that integrates the Generalized Linear Model (GLM) with Sparse DCM, termed GSD.
View Article and Find Full Text PDFEffect of integrated manual and verbal cueing on functional transfers in chronic stroke survivors: a randomized controlled study.
Disabil Rehabil
October 2024
School of Allied Health, Loma Linda University, Loma Linda, CA, USA.
Purpose: The profession of physical therapy has historically relied on manual facilitation to improve motor control strategies and performance in persons rehabilitating from a stroke, yet there is insufficient evidence to support its use during functional task training. The purpose of this study was to determine the effects of integrated cueing (verbal and manual) and verbal cueing approaches during sit-to-stand training on midline alignment & muscle activation in chronic stroke survivors.
Methods: Twenty-one chronic right-brained stroke survivors with hemiplegia were randomly assigned to the Integrated Cueing or Verbal Only group and outcome measures were recorded using an 18-Camera Motion Capture System, force plates, and surface electromyography (EMG).
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!