Related Experiment Video
Updated: Aug 16, 2026
09:13
Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder
Published on: April 22, 2015
Factors limiting suprathreshold vision measured by a flash-sound simultaneity paradigm
Velitchko Manahilov1, Kellyanne Findlay, William A Simpson
1Vision Sciences Department, Glasgow Caledonian University, Cowcaddens Road, Glasgow G4 0BA, UK. vma@gcal.ac.uk
Vision Research
|September 11, 2004
Summary
Internal noise limits visual performance. This study found that multiplicative internal noise from high contrast signals significantly impacts detecting suprathreshold visual stimuli.
Area of Science:
- Visual neuroscience
- Perceptual psychology
Background:
- Visual performance is limited by internal noise and sampling efficiency.
- Previous research indicated lower sampling efficiency for suprathreshold stimuli compared to detection tasks.
Purpose of the Study:
- To investigate visual sampling efficiency and internal noise in suprathreshold stimulus detection.
- To bypass motor system effects using a flash-sound simultaneity paradigm.
Main Methods:
- Utilized a flash-sound simultaneity paradigm to assess visual performance.
- Measured sampling efficiency for near-threshold Gabor patches (0.4 and 4 c/deg).
- Analyzed signal-dependent multiplicative and additive internal noise components.
Main Results:
- Sampling efficiency for near-threshold stimuli was only 2.5 times higher than for above-threshold patterns.
- Signal-dependent multiplicative noise matched additive noise at low contrasts but exceeded it at high contrasts.
- Observer performance aligns with a model incorporating non-linear transduction and signal-induced noise.
Conclusions:
- A model considering non-linear visual transduction and multiplicative noise explains suprathreshold detection.
- Performance is influenced by response duration, not solely signal duration.
- Multiplicative internal noise from high-contrast signals is critical for suprathreshold visual detection.
