Crossing the midline as a function of distance from midline

Area of Science:

• Neuroscience
• Developmental Psychology
• Occupational Therapy

Background:

• The Space Visualization (SV) test is a component of the Southern California Sensory Integration Tests.
• Understanding factors influencing performance on the SV test is important for assessing visual-spatial skills in children.
• Midline crossing is a developmental milestone related to sensory integration and motor control.

Purpose of the Study:

• To investigate how different block placements affect midline crossing frequency during the SV test.
• To determine the influence of age and testing distance on Space Visualization Contralateral Use (SVCU) scores.
• To analyze the impact of block placement on visual perception scores, specifically SV adjusted scores.

Main Methods:

• Administered the SV test to 71 right-handed boys aged 5 and 7 years.
• Utilized three block placement distances: 0.75, 3.00, and 6.00 inches.
• Calculated Space Visualization Contralateral Use (SVCU) and SVCU percentage scores, along with adjusted SV scores.

Main Results:

• Age and distance were significant factors for SVCU and SVCU percentage scores.
• Analysis of variance for adjusted SV scores revealed significance for trial, but not distance or age.
• A significant interaction between age and trial was observed for adjusted SV scores.

Conclusions:

• Differential block placement influences midline crossing frequency in the SV test.
• Age and testing distance are critical variables affecting contralateral use scores.
• A standardized protocol for block placement is necessary for reliable SV test administration.