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Differences between visual hemifields in identifying rapidly presented target stimuli: letters and digits, faces, and
Dariusz Asanowicz1, Kamila Smigasiewicz, Rolf Verleger
1Institute of Psychology, Jagiellonian University Krakow, Poland.
Frontiers in Psychology
|July 25, 2013
Summary
The right hemisphere (RH) shows an advantage in processing visual information, demonstrated by better identification of targets in the left visual field. This visual processing advantage appears independent of verbal load or stimulus type.
Area of Science:
- Cognitive Neuroscience
- Neuropsychology
- Visual Perception
Background:
- The right hemisphere (RH) is recognized for its dominant role in visuo-spatial processing.
- The two-stream rapid serial visual presentation task is used to study hemispheric advantages.
- A left visual field advantage in identifying the second target (T2) has been observed, often attributed to the RH.
Purpose of the Study:
- To investigate the cause of the left visual field advantage in the two-stream task.
- To test the hypothesis that the left hemisphere (LH) is disadvantaged due to verbal processing overload.
- To determine if the observed asymmetry reflects an RH advantage or an LH disadvantage.
Main Methods:
- Experiment 1: Reduced verbal processing demands.
- Experiment 2: Overloaded RH with non-verbal stimuli (faces).
- Experiment 3: Overloaded RH with non-verbal stimuli (irregular shapes).
Main Results:
- The left visual field advantage persisted across all experimental conditions.
- The advantage was largely independent of verbal load.
- The advantage was also independent of stimulus type (verbal vs. non-verbal).
Conclusions:
- The findings suggest the left visual field advantage is not primarily due to LH verbal overload.
- The results support a right hemisphere (RH) advantage in perceptual and attentional processing as the most parsimonious explanation.
- While not fully disproving the overload hypothesis, the evidence points towards an intrinsic RH superiority for this task.
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