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    Flowers in the Attic: Lateralization of the detection of meaning in visual noise

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    Author
    Cropper, SJ; McCauley, A; Gwinn, OS; Bartlett, M; Nicholls, MER
    Date
    2020-10-01
    Source Title
    Journal of Vision
    Publisher
    ASSOC RESEARCH VISION OPHTHALMOLOGY INC
    University of Melbourne Author/s
    Cropper, Simon
    Affiliation
    Melbourne School of Psychological Sciences
    Metadata
    Show full item record
    Document Type
    Journal Article
    Citations
    Cropper, S. J., McCauley, A., Gwinn, O. S., Bartlett, M. & Nicholls, M. E. R. (2020). Flowers in the Attic: Lateralization of the detection of meaning in visual noise. JOURNAL OF VISION, 20 (10), https://doi.org/10.1167/jov.20.10.11.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/251677
    DOI
    10.1167/jov.20.10.11
    Open Access at PMC
    http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7545083
    Abstract
    The brain is a slave to sense; we see and hear things that are not there and engage in ongoing correction of these illusory experiences, commonly termed pareidolia. The current study investigates whether the predisposition to see meaning in noise is lateralized to one hemisphere or the other and how this predisposition to visual false-alarms is related to personality. Stimuli consisted of images of faces or flowers embedded in pink (1/f) noise generated through a novel process and presented in a divided-field paradigm. Right-handed undergraduates participated in a forced-choice signal-detection task where they determined whether a face or flower signal was present in a single-interval trial. Experiment 1 involved an equal ratio of signal-to-noise trials; experiment 2 provided more potential for illusionary perception with 25% signal and 75% noise trials. There was no asymmetry in the ability to discriminate signal from noise trials (measured using d') for either faces and flowers, although the response criterion (c) suggested a stronger predisposition to visual false alarms in the right visual field, and this was negatively correlated to the unusual experiences dimension of schizotypy. Counter to expectations, changing the signal-image to noise-image proportion in Experiment 2 did not change the number of false alarms for either faces and flowers, although a stronger bias was seen to the right visual field; sensitivity remained the same in both hemifields but there was a moderate positive correlation between cognitive disorganization and the bias (c) for "flower" judgements. Overall, these results were consistent with a rapid evidence-accumulation process of the kind described by a diffusion decision model mediating the task lateralized to the left-hemisphere.

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