Culture shapes the SNARC-like effect for visual speed.

Area of Science:

• Cognitive Psychology
• Cross-Cultural Psychology
• Neuroscience

Background:

• Spatial representation of abstract quantities like numbers and time can be influenced by cultural habits, particularly reading and writing direction.
• Previous research shows inconsistent effects for numerical magnitudes compared to time, possibly because reading direction is not inherently linked to numerical content.
• Experiential associations are hypothesized to underlie the spatial representation of magnitudes.

Purpose of the Study:

• To investigate cross-cultural differences in the spatial representation of visual speed.
• To examine if reading and writing direction (left-to-right vs. right-to-left) influences the spatial mapping of motion perception.

Main Methods:

• Comparison of visual speed perception between Italian (left-to-right reading) and Iranian (right-to-left reading) participants.
• Participants judged the speed of a random dot kinematogram relative to a reference speed.
• Response mapping involved using left or right keys to indicate faster or slower judgments.

Main Results:

• Italian participants exhibited a left-to-right spatial mapping for visual speed.
• Iranian participants demonstrated a right-to-left spatial mapping for visual speed.
• Opposite spatial mappings were observed, correlating with participants' reading and writing directions.

Conclusions:

• Reading and writing direction significantly shapes the spatial representation of magnitudes.
• Directional reading experiences, like those associated with motion perception, are intrinsically linked to cultural spatial mappings.
• Cultural habits related to sequential information processing influence the perception of non-numerical, directional magnitudes.