# Gabor patch data - units **URL:** \ **Category:** Technical\ **Tags:** experiment-design, brain-observatory-visual-coding, analysis\ **Created:** [February 10, 2021, 3:54am UTC](https://community.brain-map.org/t/gabor-patch-data-units/938 "2021-02-10T03:54:12Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![cspurandare](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/cspurandare/32/300_2.png) [@cspurandare](https://community.brain-map.org/u/cspurandare)\ **Post date:** [February 10, 2021, 3:54am UTC](https://community.brain-map.org/t/gabor-patch-data-units/938/1 "2021-02-10T03:54:12Z")
Hello, I am using the Neuropixel data, and analyzing the Gabor patch presentations. The technical white paper says that the 20 degree patches were presented in a 9 x 9 grid, and indeed the x\_pos and y\_pos for these stimuli range from -40 to +40 in jumps of 10. But I am wondering what are the units of these? Are x and y pos in degrees or cm? Also how do they relate to the screen co-ordinates provided by gaze mapping? For example if at some point, Gabor patch was presented at (-10,20) and the “filtered\_gaze\_mapping” data, in screen\_coordinates\_spherical also recorded (-10,20) would that mean that the animal looked directly at the Gabor patch? Thanks for your help and also to make all this interesting data available to everyone ! Chinmay ---
**Author:** ![joshs](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/joshs/32/8_2.png) [@joshs](https://community.brain-map.org/u/joshs)\ **Post date:** [February 10, 2021, 4:04am UTC](https://community.brain-map.org/t/gabor-patch-data-units/938/2 "2021-02-10T04:04:31Z")
Hi Chinmay! The units for both the Gabors and the gaze direction are in degrees relative to the center of the screen. ---
**Author:** ![cspurandare](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/cspurandare/32/300_2.png) [@cspurandare](https://community.brain-map.org/u/cspurandare)\ **Post date:** [February 10, 2021, 4:23am UTC](https://community.brain-map.org/t/gabor-patch-data-units/938/3 "2021-02-10T04:23:23Z")
Thank you so much for your prompt reply ! I had 1 follow up question - the Gaze mapping data has 2 fields for screen coordinates, either screen\_coordinates and screen\_coordinates\_spherical. My understanding is that the latter one is after applying the spherical warping? If yes, which of these is directly comparable to the Gabor patch x\_pos and y\_pos? Thanks again, Chinmay ---
**Author:** ![joshs](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/joshs/32/8_2.png) [@joshs](https://community.brain-map.org/u/joshs)\ **Post date:** [February 21, 2021, 11:26pm UTC](https://community.brain-map.org/t/gabor-patch-data-units/938/4 "2021-02-21T23:26:21Z")
Hi! Sorry for the delay in responding to the follow-up. The Gabor patch locations are relative to the warped (spherical) coordinates. ---
**Author:** ![cspurandare](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/cspurandare/32/300_2.png) [@cspurandare](https://community.brain-map.org/u/cspurandare)\ **Post date:** [March 15, 2021, 6:39pm UTC](https://community.brain-map.org/t/gabor-patch-data-units/938/5 "2021-03-15T18:39:43Z")
Hi Josh, thanks for your reply. Sorry to bother you again, but we are hoping to use the eye tracking data from this repository for some behavioral controls/estimation, so I wanted to confirm that the Eye movements cover a smaller region of screen, than Gabor patches. So as seen in the image below, the gaze on screen is within 20-30 spherical degrees, along x as well as y whereas the Gabors cover ~80 degrees(40 on each side) of view, as designed. Further, is it correct that the Gaze position along x would correspond to horizontal eye movement, and along y correspond to vertical eye movement? Or is that flipped? Thanks again, Chinmay ![ToAllenBrain](https://canada1.discourse-cdn.com/flex027/uploads/brainobservatory/original/1X/5ff05a3d3d6864f6d9ecbc8dd8cfc996f1e182d6.png) ---
**Author:** ![joshs](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/joshs/32/8_2.png) [@joshs](https://community.brain-map.org/u/joshs)\ **Post date:** [March 15, 2021, 8:54pm UTC](https://community.brain-map.org/t/gabor-patch-data-units/938/6 "2021-03-15T20:54:00Z")
Your plots are correct…the center of gaze for each mouse is typically confined to a very small region of the screen. And yes, x = horizontal, y = vertical.