Arrowheads Investigation Report

This study examines the Muller-Lyer illusions in the length of the arrow bisects each other with different sizes of arrowheads. The current study aims to see whether the size of the arrowheads had an effect in measuring the bisector between the two arrow heads. It is hypothesized that the smallest arrowhead (50%) is closer to middle line of the arrow length as well as the larger the size of arrowhead (150%) is the shorter in measurement of the bisector between the two arrowheads. The study conducted on 60 students (21 males, 39 females, Mage=21.68 years, SD=1.68) ranging from 20 to 26 years old. The data obtained and analysed using descriptive statistics. Results shown were non-significant for the first hypothesis and significant for the largest …show more content…
The largest the size of the arrow head (150%), the shorter the length of measurement bisect between the two arrowheads.

Methods
Participants
Total participants of 60 students (N=60) were recruited using random sampling with normal vision and normal corrected vision. The age of the participants ranged from 20 to 26 years old (M=21.68, SD=1.68). They are consisted of 21 males and 39 females. The participants were divided into 3 groups in accordance to the sizes of arrowheads. For each size of arrowhead, there were 20 participants. One size of the arrowhead was used for a group, and being measured individually.
Research Design This experiment is between group designs. Each participant was introduced to one condition only, which is one size of the arrow head. The independent variable in this experiment is the sizes of arrowhead. The dependent variable is the measurement of the bisector of the length between the two arrowheads.
Materials
The materials were made out of two pieces of papers with the image of line and two arrowheads. The papers is adjustable so that the participants can move the line to get equal length for both sides. There are three sets of papers consists of different sizes of arrowheads. The sizes were 50%, 100%, and 150%. Pen and paper was used to record the measurement, in …show more content…
The result shows the size of 100% arrowhead was much closer than the 50% size of arrowhead. It was hypothesized that the 50% of the arrow head measured closely to middle length of the arrow. The data obtained did not support this hypothesis. The participants measured average mean of 13.5 which is 21% less from actual length for each arrows. Another finding which accepted the hypothesis where the the larger of the arrowhead the shorter the measurement of bisects. The results shows that the participants exposed to 150% of the arrowhead (M=13.23, SD=1.52) measured further away from the middle length of the arrowhead despite they may have seen the other side of the arrowhead bigger than the one they were seeing. In the classical Muller-Lyer figure, the inward-oriented fins shortening the length of the arrow and outwards-oriented fins makes it longer. On the other hand, in reverse Muller-Lyer illusions, if the arrowheads are placed farther away from the end of the arrow, the inward-oriented fins appears longer than the outward fins (Mancini, Bricolo & Vallar,

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