The Flow Parsing Theory
The Flow Parsing Theory
Embedded Files
Green Arrow: The optic flow vectors motion (scattered background).
Red Arrow: The stimulus motion (the circle probe).
Blue Arrow: The optic flow and probe result is the final percept, representing how subjects perceived stimulus motion under the effect of optic flow.
Experiment Demo
Step 1: Subjects see a probe (the circle stimulus) travel at a specific angle and speed. Subjects would report their best estimate of the probe's traveling angle using the arrow.
Step 2: Subjects then see the same probe travel at the same angle and speed, but with an optic flow background. Subjects would report their best estimate of the probe's traveling angle again.
Subjects' View
Subjects are seated right where the camera is pointing. Subjects would put their chin on the headrest like an eye exam, and fixate on a fixation point on the screen. Eye tracking is set up in between the subject and the screen.
Experimenter's Setup (outside of the subjects' testing room)
Subjects' eye movements and specific eye tracking data are displayed on the left-hand-side screen. Live time trials are being displayed on the right-hand-side screen. When their eyes are fixated on the fixation point, a high-pitched beep sound would be played for a successful trial. If their eyes are not fixated on the fixation point, a low-pitched beep sound would be played for a failed trial. Not-fixated trials were excluded from the data.
Raw data of different conditions
Raw data of different conditions
Blue curve: Prediction model based on existing theory (flow parsing).
Orange Dots: A single trial.
The bottom right corner figure illustrates the location of the optic flow, which is presented on the screen.
Results of all conditions (N=4)
Results of all conditions (N=4)
This plot illustrates the average relative tilt (in degrees) of a probe under different conditions when the optic flow is present. The x-axis represents the conditions: 4 different conditions.
Data Observations:
Before optic flow, there is minimal effect across conditions.
During the optic flow (first and second halves), there is a significant increase in relative tilt (more effect), peaking at over 30 degrees in some conditions.
After optic flow (both static and disappeared), the relative tilt decreases but remains above baseline in most cases (less effect).
Expo Poster
Expo Poster
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