Merge pull request #689 from pupil-labs/update-fixation-whitepaper

Update fixation whitepaper link to Algorithm description - 3.6.24

neon/data-collection/data-streams/index.md

@@ -31,7 +31,7 @@ The two primary types of eye movements exhibited by the visual system are fixati
 
 ![Fixations](./fixations.jpg)
 
-Fixations and saccades are calculated automatically in Pupil Cloud after uploading a recording and are included in the recording downloads. The deployed fixation detection algorithm was specifically designed for head-mounted eye trackers and offers increased robustness in the presence of head movements. Especially movements due to vestibulo-ocular reflex are compensated for, which is not the case for most other fixation detection algorithms. You can learn more about it in the [Pupil Labs fixation detector whitepaper](https://docs.google.com/document/d/1dTL1VS83F-W1AZfbG-EogYwq2PFk463HqwGgshK3yJE/export?format=pdf) and in our [publication](https://link.springer.com/article/10.3758/s13428-024-02360-0) in *Behavior Research Methods* discussing fixation detection strategies.
+Fixations and saccades are calculated automatically in Pupil Cloud after uploading a recording and are included in the recording downloads. The deployed fixation detection algorithm was specifically designed for head-mounted eye trackers and offers increased robustness in the presence of head movements. Especially movements due to vestibulo-ocular reflex are compensated for, which is not the case for most other fixation detection algorithms. You can learn more about it in the [Pupil Labs fixation detector whitepaper](https://docs.google.com/document/d/1CZnjyg4P83QSkfHi_bjwSceWCTWvlVtbGWtuyajv5Jc/export?format=pdf) and in our [publication](https://link.springer.com/article/10.3758/s13428-024-02360-0) in *Behavior Research Methods* discussing fixation detection strategies.
 
 We detect saccades based on the fixation results, considering the gaps between fixations to be saccades. Note, that this assumption is only true in the absence of smooth pursuit eye movements. Additionally, the fixation detector does not compensate for blinks, which can cause a break in a fixation and thus introduce a false saccade.