Manipulating inattentional blindness within and across sensory modalities

Area of Science:

• Cognitive Psychology
• Neuroscience
• Attention Studies

Background:

• Inattentional blindness (IB) describes the failure to consciously perceive events outside the focus of attention.
• Previous research primarily examined IB within a single sensory modality.

Purpose of the Study:

• To investigate inattentional blindness for words presented within and across sensory modalities (visual and auditory).
• To determine if dividing attention across different senses has the same consequences as dividing attention within a single sensory modality.

Main Methods:

• Participants monitored rapid streams of pictures or sounds concurrently with task-irrelevant spoken or written words.
• A word recognition test measured processing of unattended words compared to explicitly monitored words.
• Experiments manipulated unimodal and crossmodal attention conditions.

Main Results:

• High levels of inattentional blindness were observed for both visually and auditorily presented words in unimodal conditions.
• IB was also produced under crossmodal conditions.
• However, inattentional blindness was less prevalent when attention was divided across sensory modalities compared to within a single modality.

Conclusions:

• Findings support the attentional load hypothesis.
• Attention resources appear to be shared, to some extent, across sensory modalities.
• Dividing attention across senses may be less disruptive than dividing it within a single sense.