# Visual Degrees to Pixels Mapping Convention

**URL:** <https://community.brain-map.org/t/visual-degrees-to-pixels-mapping-convention/4964>\
**Category:** Technical\
**Tags:** allensdk, api, brain-observatory-visual-coding\
**Created:** [June 4, 2026, 8:57pm UTC](https://community.brain-map.org/t/visual-degrees-to-pixels-mapping-convention/4964 "2026-06-04T20:57:52Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![basementcrusader](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/basementcrusader/32/2482_2.png) [@basementcrusader](https://community.brain-map.org/u/basementcrusader)\
**Post date:** [June 4, 2026, 8:57pm UTC](https://community.brain-map.org/t/visual-degrees-to-pixels-mapping-convention/4964/1 "2026-06-04T20:57:52Z")

</div>

Hi,

I am using some gaze mapping data from a visual coding experiment to understand the center of gaze during a stimulus presentation. I have included an example of my code below calculating the gazePosition on the monitor and the output when plotting. My question is if the pixel coordinate that I am returned when using **m.visual\_degrees\_to\_pixels** map to a pixel coordinate on a pre-warped monitor (shown below) or a post-warped monitor?

I would appreciate any clarification here.

Thanks in advance,

Nick B.

```python
import allensdk.brain_observatory.stimulus_info as si
m =si.BrainObservatoryMonitor()

gazeData = individualSession.get_screen_gaze_data()

gazePosition=[m.visual_degrees_to_pixels(row.raw_screen_coordinates_spherical_x_deg), m.visual_degrees_to_pixels(row.raw_screen_coordinates_spherical_y_deg)]) for row in gazeData.itertuples()] + m.experiment_geometry.mon_res/2

```

 ![image](https://canada1.discourse-cdn.com/flex027/uploads/brainobservatory/original/2X/9/9bfebf080ce187e43c7c232bf106ba370e578998.png)

---

<div class="post-metadata">

**Author:** ![saskiad](https://yyz1.discourse-cdn.com/flex027/user_avatar/community.brain-map.org/saskiad/32/1695_2.png) [@saskiad](https://community.brain-map.org/u/saskiad)\
**Post date:** [June 15, 2026, 6:52pm UTC](https://community.brain-map.org/t/visual-degrees-to-pixels-mapping-convention/4964/2 "2026-06-15T18:52:58Z")

</div>

Hi Nick,

The gaze position is provided in visual degrees. However, it cannot be mapped to specific pixels on the monitor. The gaze position should be analyzed as a relative value.

Best,  
Saskia