Abraham Zapruders' involuntary startle response to the sound of a gunshot at z224 is evident by the sudden film blur at z227.
Here is my jiggle analysis of the Zapruder footage, for the record.I found that the jiggles/blurring do not tell us whether Z218 (my estimate) or Z222 (the standard estimate) are the magic bullet.
Re the jiggles/blurring at Z227 & Z228, i found nothing significant.
............... I had a close look at Z001 to Z486. I rated each frame as 0 or 1 or 2 or 3 or 4 for blur for horizontal blur[H] , & for vertical blur [V].
There was significant blur (ie rated 2 or 3 or 4) in the following frames (ie ignoring any 0 or 1).
.............. Z001 to Z132 The first sequence.Z003 H2 V0.
Z013 H4 V0. Z014 H2 V0. Probly not a true reaction to anything special.
Z037 H3 V0. Probly not a true reaction to anything special.
ZO53 H3 V0. Probly not a true reaction to anything special.
Z058 H2 V0.
Z066 H4 V0. Probly not a true reaction to anything special.
Z068 H3 V0. Probly not a true reaction to anything special.
Z070 H2 V0.
Z082 H2 V1.
Z087 H3 V0. Z088 H2 V0. ZO89 H3 V1. ZO90 H3 V1. Probly not a true reaction to anything special.Z104 H2 V0.
Z108 H2 V0.
Z132 H3 V0. Probly due to the camera stopping. This is the last frame of the first sequence.
Z133 H0 V0. This is the first frame of the 2nd sequence.Z134 H3 V0. Probly not a true reaction to anything special. [edit][a voluntary jiggle at Z134 suggests a shot at pseudo Z112]
......... Z135 H0 V0.
Z191 H2 V0. Probly not a true reaction to anything special. But could suggest a shot at Z169.
Z197 H3 V0. Probly not a true reaction to anything special. But could suggest a shot at Z175.
Z218 H0 V0. This is where i reckon that JFK & Connally were hit (the magic bullet).
Z219 H0 V0. Z220 H0 V0. Z221 H0 V0.
Z222 H1 V0. This is where many reckon that JFK & Connally were hit. If so then Oswald would have fired at Z219.8. The sound would reach Zapruder at Z224.3, ie there might be a shock jiggle at Z225, & a possible startle jiggle 5 frames later at Z230, & a possible voluntary reaction 18 frames later at Z243. But there is no significant jiggle of any kind until Z318. Likewize there is no jiggle to support the magic bullet landing at my Z218. The magic bullet simply did not result in a jiggle of any kind, ie zero shock jiggle, zero startle jiggle, zero voluntary jiggle. The jiggles do not tell us whether Z218 or Z222 are the magic bullet.
Z223 H0 V0. Z224 H0 V0. Z225 H0 V0. Z226 H0 V0. Z227 H0 V1. Z228 H0 V0. Z229 H0 V0. Z230 H0 V0.
We have H0 V0 for the next 46 frames. The previous significant jiggle was at Z197. The next significant jiggle is at Z318.
Z313 H1 V0. This frame shows the fatal headshot.
Z314 H0 V0. This is where we could get a shock jiggle due to Hickey's AR15 shot at Z312.85.
......... Z315 H0 V0.
Z316 H0 V0. This is where we could get a shock jiggle if Oswald fired a Carcano shot at Z310.80.
Z317 H0 V0.
Z318 H4 V4. Z319 H3 V2. This is Zapruder's startle reaction to seeing the headshot at Z313 (delay=5 frames).
Z320 H1 V0. Z321 H0 V0. Z322 H0 V0. Z323 H0 V0. Z324 H1 V0. Z325 H1 V0. Z326 H0 V0. Z327 H0 V0. Z328 H0 V0. Z329 H0 V0. Z330 H0 V0.Z331 H2 V1. Z332 H2 V2. This is Zapruder's voluntary reaction (delay=18 frames).
Z333 H0 V0.
Z360 H2 V0. Probly not a true reaction to anything special.
Z363 H2 V3. Probly not a true reaction to anything special.
Z385 H3 V3. Probly not a true reaction to anything special.
Z417 H2 V1. Probly not a true reaction to anything special.
The later frames up to the last frame Z486 are not worth rating.