▁view ing ▁diff ers ▁with ▁levels ▁of ▁cogn itive ▁development ▁- ▁fix ation ▁dur ations ▁are ▁thought ▁to ▁short en ▁and ▁sac cade ▁amplit udes ▁length en ▁with ▁an ▁increase ▁in ▁age . ▁ ▁Sp atial ▁variation ▁Where ▁eye ▁movements ▁fix ate ▁is ▁affected ▁by ▁both ▁bottom - up ▁and ▁top - down ▁factors . ▁Even ▁an ▁initial ▁g limp se ▁of ▁a ▁scene ▁has ▁an ▁influence ▁on ▁subsequent ▁eye ▁movements . ▁In ▁bottom - up ▁factors , ▁the ▁local ▁contrast ▁or ▁prom in ence ▁of ▁features ▁in ▁an ▁image , ▁such ▁as ▁a ▁large ▁contrast ▁in ▁l umin ance ▁or ▁a ▁greater ▁density ▁of ▁edges , ▁can ▁affect ▁the ▁guidance ▁of ▁eye ▁movements . ▁However , ▁the ▁top - down ▁factors ▁of ▁scenes ▁have ▁a ▁greater ▁impact ▁in ▁where ▁eyes ▁fix ate . ▁Are as ▁containing ▁more ▁meaning ful ▁features , ▁or ▁areas ▁where ▁colour ▁a ids ▁the ▁disc rim ination ▁of ▁objects , ▁can ▁influence ▁eye ▁movements . ▁Im ages ▁which ▁are ▁related ▁to ▁previous ▁images ▁shown ▁can ▁also ▁have ▁an ▁effect . ▁E ye ▁movements ▁can ▁also ▁be ▁gu ided ▁towards ▁items ▁when ▁they ▁are ▁heard ▁verb ally ▁at ▁the ▁same ▁time ▁as ▁seeing ▁them . ▁Cross - c ultur ally , ▁it ▁has ▁been ▁found ▁that ▁Western ers ▁have ▁an ▁incl ination ▁to ▁concent rate ▁on ▁foc al ▁objects ▁in ▁a ▁scene , ▁whereas ▁East ▁A si ans ▁attend ▁more ▁to ▁context ual ▁information . ▁ ▁Tem por al ▁variation ▁A verage ▁fix ation ▁dur ations ▁last ▁for ▁about