Iscan-Helmer 1993
Definition
The edited volume 'Forensic Analysis of the Skull' (Iscan and Helmer, Wiley-Liss, 1993) that brought together the first systematic reliability assessment of photo-skull superimposition and established the evidence base for the method's epistemological limitations.
- Title
- Forensic Analysis of the Skull
- Editors
- Iscan and Helmer
- Publisher and year
- Wiley-Liss, 1993
- Contribution
- First systematic reliability assessment of photo-skull superimposition
Common questions
Why is this 1993 volume still cited in superimposition casework today?+
It remains the reference point where the method's error rates and interpretive limits were first assembled systematically, so later courts and practitioners cite it to establish the epistemological baseline against which any claimed superimposition identification is judged.
What limitation of photo-skull superimposition did this work establish?+
It documented that superimposition can exclude a skull as not matching a photograph with reasonable confidence, but positive identification claims from superimposition alone carry a much higher uncertainty than exclusion, a distinction still emphasised in current practice.
Related terms
- Consistent with
- The categorical superimposition conclusion that examined morphological features do not exclude the skull as deriving from the same individual as the portrait....
- Exclusion
- The categorical conclusion that one or more examined features are clearly inconsistent in a way that cannot be explained by projection angle,...
- Frankfurt Horizontal Plane
- The anatomical reference plane defined by the upper border of the external acoustic meatus and the lowest point of the orbital margin...
- Glaister-Brash Method
- The original photographic-transparency superimposition protocol developed by John Glaister Jr and James Couper Brash for the 1935 Buck Ruxton case in Lancaster...
- Gnathion
- The most inferior point of the mandibular symphysis in the midline, corresponding to the tip of the chin in the portrait photograph....
- Gonion
- The most posterior and inferior point of the mandibular angle, bilaterally. Used in superimposition to assess the width of the jaw angle...
- Nasion
- The anatomical landmark at the junction of the nasal bones and the frontal bone (the bridge of the nose). One of the...
- Photo-Skull Superimposition
- The forensic identification method of placing a life portrait photograph alongside or overlaid on a photograph of a recovered skull, aligning them...
- Video Superimposition
- The updated superimposition workflow using a motorised skull turntable, a calibrated video camera, and real-time electronic mixing of the skull video image...