# What did Smith & Henderson's eye-tracking study find about continuity editing rules (match action, gaze match) and unnoticed cuts, and what does it mean for cutting AI shots?

- id: art_01M5NMVWQJW7RH387NHP0KRXH1
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T02, T10, T20 · tags: none
- updated: 2026-10-24T00:27:13.005Z
- url: https://veyrul.com/articles/art_01M5NMVWQJW7RH387NHP0KRXH1

Problem. Continuity rules are taught as craft; is there evidence that they hide cuts? Conditions. Smith & Henderson (2008): participants watched seven feature-film excerpts (five minutes each, DVD-quality) and pressed a button when they saw an edit; eyes were tracked; edits were hand-coded for adherence to the rules, including Between Scene, Within Scene, Match Action and Gaze Match. Method (reported). Edits constructed according to the Continuity Editing Rules gave greater edit blindness than edits not adhering to them; a quarter of edits joining two viewpoints of the same scene went undetected, a third when the cut coincided with a sudden onset of motion. The Match Action rule is stated in the paper as a smooth cut between two viewpoints of the same action achieved by coinciding the cut with a sudden onset of motion. Only 8.8% of edits coincided with a saccade, and the authors conclude that most unnoticed cuts come from inattentional blindness as viewers follow the narrative. For ...

Problem. Continuity rules are taught as craft; is there evidence that they hide cuts? Conditions. Smith & Henderson (2008): participants watched seven feature-film excerpts (five minutes each, DVD-quality) and pressed a button when they saw an edit; eyes were tracked; edits were hand-coded for adherence to the rules, including Between Scene, Within Scene, Match Action and Gaze Match. Method (reported). Edits constructed according to the Continuity Editing Rules gave greater edit blindness than edits not adhering to them; a quarter of edits joining two viewpoints of the same scene went undetected, a third when the cut coincided with a sudden onset of motion. The Match Action rule is stated in the paper as a smooth cut between two viewpoints of the same action achieved by coinciding the cut with a sudden onset of motion. Only 8.8% of edits coincided with a saccade, and the authors conclude that most unnoticed cuts come from inattentional blindness as viewers follow the narrative. For missed Match Action cuts the eyes were usually open and fixating (no saccade). Mapping to AI shots [inference]. (1) Put cuts at the onset of motion with the same action continuing in the next shot, so the viewer's attention is on the motion; generated shots should therefore start with the action already under way when used as the second half of a match action cut (trim the first frames if the generator ramps from stillness). (2) Gaze match: cut from a character looking off to a shot of the target; generate the target as a separate shot and check eyeline direction (C3-B571-12). (3) Do not expect motion blur or blinks to hide a mismatch; the evidence points at attention to the story. Failure modes. A cut that hides well still fails if the action mismatches on the frames the viewer is watching. Limitations. Small sample (the study used seven films and a limited participant group; counts in the paper), film excerpts not AI footage; detection task changes normal viewing. Version/date. JEMR 2(2):6 (2008).

Curator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.

Limitations: Percentages are for hand-coded film excerpts; their generality is limited and AI shots were not tested.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://bop.unibe.ch/JEMR/article/download/2264/3460/0",
      "note": "Abstract; Abstract; Introduction: Match Action; Abstract; Results: saccades; Mapping to AI shots"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Problem. Continuity rules are taught as craft; is there evidence that they hide cuts? Conditions. Smith & Henderson (2008): participants watched seven feature-film excerpts (five minutes each, DVD-quality) and pressed a button when they saw an edit; eyes were tracked; edits were hand-coded for adherence to the rules, including Between Scene, Within Scene, Match Action and Gaze Match. Method (reported). Edits constructed according to the Continuity Editing Rules gave greater edit blindness than edits not adhering to them; a quarter of edits joining two viewpoints of the same scene went undetected, a third when the cut coincided with a sudden onset of motion. The Match Action rule is stated in the paper as a smooth cut between two viewpoints of the same action achieved by coinciding the cut with a sudden onset of motion. Only 8.8% of edits coincided with a saccade, and the authors conclude that most unnoticed cuts come from inattentional blindness as viewers follow the narrative. For missed Match Action cuts the eyes were usually open and fixating (no saccade). Mapping to AI shots [inference]. (1) Put cuts at the onset of motion with the same action continuing in the next shot, so the viewer's attention is on the motion; generated shots should therefore start with the action already under way when used as the second half of a match action cut (trim the first frames if the generator ramps from stillness). (2) Gaze match: cut from a character looking off to a shot of the target; generate the target as a separate shot and check eyeline direction (C3-B571-12). (3) Do not expect motion blur or blinks to hide a mismatch; the evidence points at attention to the story. Failure modes. A cut that hides well still fails if the action mismatches on the frames the viewer is watching. Limitations. Small sample (the study used seven films and a limited participant group; counts in the paper), film excerpts not AI footage; detection task changes normal viewing. Version/date. JEMR 2(2):6 (2008). · locator: Abstract; Abstract; Introduction: Match Action; Abstract; Results: saccades; Mapping to AI shots · source: https://bop.unibe.ch/JEMR/article/download/2264/3460/0

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