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Related Experiment Video

Updated: Jul 4, 2026

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

Published on: February 13, 2011

Second-order motion discrimination by feature-tracking.

A M Derrington¹, O I Ukkonen

¹Department of Psychology, University of Nottingham, UK. andrew.derrington@nottingham.ac.uk

Vision Research

|May 27, 1999

Summary

This summary is machine-generated.

Visual perception of plaid patterns depends on jump timing. The brain tracks contrast envelope motion at fast intervals and luminance profile motion at slower intervals, indicating selective feature tracking.

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Area of Science:

Visual perception
Computational neuroscience
Psychophysics

Background:

Plaid patterns, composed of high spatial frequency gratings, exhibit complex motion phenomena.
The perception of motion in such patterns can be ambiguous, involving both luminance and contrast envelope components.

Purpose of the Study:

To investigate how temporal intervals influence the perceived direction of motion in plaid patterns.
To explore the underlying mechanisms of motion perception, specifically feature tracking.

Main Methods:

Psychophysical experiments using horizontally jumping plaid patterns with varying temporal intervals.
Addition of a pedestal to manipulate contrast thresholds for perceived motion.
Testing the effect of static plaids and simple gratings on motion perception.

Main Results:

Perceived motion direction reverses based on jump repetition intervals (faster intervals: contrast envelope motion; slower intervals: luminance profile motion).
A pedestal increases the contrast needed to perceive contrast envelope motion, but not luminance profile motion.
Pattern-specific feature tracking mechanisms are implicated, showing selectivity for plaid patterns over gratings.

Conclusions:

Human visual system employs distinct mechanisms for processing plaid motion, influenced by temporal factors.
Contrast envelope motion is likely mediated by a feature-tracking system selective for specific pattern types.
The findings provide insights into the selectivity and adaptability of visual motion processing.