Raeding with the fingres: Towards a universal model of letter position coding

Area of Science:

• Cognitive Psychology
• Neuroscience
• Sensory Perception

Background:

• Letter position coding is crucial for visual word recognition but less understood in the tactile (Braille) modality.
• Previous research indicated Braille readers do not exhibit transposed-letter effects for non-adjacent transpositions, unlike sighted readers.
• This suggested visual modality-specific factors influence letter position coding flexibility.

Purpose of the Study:

• To investigate whether transposed-letter effects occur with adjacent letter transpositions in Braille reading.
• To determine if the tactile modality, like the auditory modality, shows adjacent-transposition effects.
• To understand if serial order processing mechanisms are universal or shaped by sensory input.

Main Methods:

• A lexical decision task was employed using Braille stimuli.
• Participants identified real words versus pseudowords.
• Pseudowords were created by either transposing adjacent letters (e.g., 'laboartory') or replacing letters (e.g., 'laboestory') of base words (e.g., 'laboratory').

Main Results:

• Pseudowords with transposed adjacent letters were more confusable with their base words compared to orthographic control pseudowords.
• Transposed-letter pseudowords elicited significantly more errors and slower response times.
• These findings indicate an adjacent-transposition effect in Braille reading.

Conclusions:

• The mechanism of serial order processing in word recognition is not solely modality-independent.
• Tactile word recognition in Braille exhibits transposed-letter effects for adjacent transpositions.
• Sensory modality plays a role in shaping the flexibility of letter position coding during reading.