pls help with the code as i dont get it

$\%\%\%\%\%\%\%$ changes on this iteration

$\%\%\%\%\%$ now collecting $6$ Annulus Sizes and $6$ Luminance levels for all

$\%\%\%\%\%$ constrast polarity conditions. IT will take long

$\%\%$ start$-$up

clear;

$\%$ clc;

rng default $\%$ set to default if legacy seed is active

rng shuffle $\%$ every daym shufflin'

sca; $\%$ in case there is anything in buffers and such

PsychDefaultSetup$(0)\%$ reset it

AssertOpenGL; $\%$ add openGL $($since we reset it above$)$

Screen$(\text{'}$Preference$\text{'},$ 'SkipSyncTests', $1)$;

$\%\%\%$ if you have to set above to $1,$ you'd be better off finding out why.

$\%\%\%$ This is not a default PTB state, don't be casual about disabling the

$\%\%\%$ vertical sync test. Try disabling any vertical sync algorithm in your

$\%\%\%$ driver $($Nvidia$)$ instead. Sync is NOT important for this code, but for

$\%\%\%$ smooth experience following participant inputs, it is recommended.

load$(\text{'}$LG$\_$UltraGear$\_256\_24-$Nov$-2021.$mat'$)$; $\%$ LG color info file

$\%\%$ parameters $($edit only here$)$

$\%$ flags

fFixation$=$false; $\%$ do we display a fixation cross

fCenterDiscs$=$false; $\%$ discs centered each half $($or apart by distanceDisc$\_$dg$)$

fActualLuminance$=$true; $\%$ use exact luminance matched to RBG vs log steps $($they are so close$)$

fAllowMaxValueForManipulation$=$false; $\%$ do I allow manipulated stimuli to match max or min luminance at extremes

fDiscNoMatchAnnulus$=$true; $\%$ do we allow conditions where annulus and the fixed disc have the same luminance

fSolidDiscForVariable$=$false; $\%$ do we allow starter color Variable disc to be the same for solid $($true isn't coded at this iteration $-$ check $525)$

$\%$ experiment parameters

subjectDistance$\_$mm$=570$; $\%$ how far the person should sit

radiusDisc$\_$dg$=0\mathrm{.}7$;

fixation$\_$dg$=0\mathrm{.}5$; $\%$ of one line

distanceDiscs$\_$dg$=10$; $\%$ edge to edge $($discs$)$

luminanceCount$=6$; $\%$ how many steps are we gonna have $($interacts with logStep$)$

logStep$=0\mathrm{.}1$; $\%$ the value where we iterate levels of contrast

radiusAnnulus$\_$dg$=0\mathrm{.}10$; $\%$ starting point of annulus radius $($portion beyond disc$)$

annulusSteps$\_$dg$=0\mathrm{.}60$; $\%$ how much annulus gets bigger in each stair steps

annulusSizeCount$=6$; $\%$ how many different sizes we can and should try

nTrialPerCondition$=6$; $\%$ how many trials in a condition $($now interacts with variable disc brightness spread$)$

discOffset$=10$; $\%$ brightness levels offset of the variable disc starting values from mean

nBlock$=4$; $\%4$ conditions explained below

$\%\%\%\%$ The annulus luminance is fixed on each trial but varies from trial to

$\%\%\%\%$ trial over a range that is limited by the constraints of the condition

$\%\%\%\%\%\%\%\%\%$ INC$-$INC $(1),$ INC$-$DEC $(2),$ DEC$-$INC $(3),$ DEC$-$DEC $(4).$

$\%\%\%\%-$ INC$-$x means dark background $($black but measurable$)$

$\%\%\%\%-$ DEC$-$x means white background $($background is the highest luminance

$\%\%\%\%$ among the background, disks and annulus$).$

$\%\%\%\%-$ x$-$INC means the disk is constrained to be higher RGB than the annulus.

$\%\%\%\%-$ x$-$DEC means disk constrained to be lower RGB than the annulus.