Mental rotation by the blind: does mental rotation depend on visual imagery?

Area of Science:

• Cognitive Psychology
• Neuroscience
• Sensory Perception

Background:

• Mental rotation is a cognitive process often associated with visual imagery.
• Previous research has primarily explored mental rotation in sighted individuals.
• The role of visual imagery in mental rotation for individuals with congenital blindness was unclear.

Purpose of the Study:

• To investigate whether congenitally blind adults can perform mental rotation of tactile forms.
• To determine if mental rotation relies on visual imagery.
• To compare the mental rotation abilities of congenitally blind, adventitiously blind, and sighted individuals.

Main Methods:

• Participants (congenitally blind, adventitiously blind, and sighted) judged pairs of tactile forms for same-different judgments.
• Forms were presented in identical orientations or with angular discrepancies (30-150 degrees).
• Reaction times and introspective reports were collected.

Main Results:

• Reaction times for all groups increased linearly with the angular discrepancy between forms.
• Congenitally blind participants demonstrated mental rotation capabilities comparable to sighted and adventitiously blind individuals.
• Introspective reports corroborated the use of mental rotation strategies.

Conclusions:

• Mental rotation of tactile forms is possible for congenitally blind individuals.
• The findings suggest that visual imagery is not a prerequisite for mental rotation.
• This challenges the necessity of visual imagery in the cognitive process of mental rotation.