Adaptive procedures in psychophysical research

Leek, Marjorie R.

doi:10.3758/bf03194543

Cited by 691 publications

(613 citation statements)

References 45 publications

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“…This assumption has not been found to be robust (e.g., Lecluyse & Meddis, 2009), though Gu and Green (1994) argued this finding away, claiming that because the threshold estimates produced by the procedure are consistent with others reported in the literature, it is a moot point whether these assumptions are upheld. However, Lecluyse and Meddis reported that psychometric functions do differ across clinical groups, and a universal form should not be assumed; this stance was supported by Leek (2001). Amitay, Irwin, Hawkey, Cowan and Moore (2006) reported that with novice participants, the form of the underlying psychometric function is prone to change due to learning effects.…”

Section: Discussionmentioning

confidence: 74%

The single interval adjustment matrix (SIAM) yes–no task: an empirical assessment using auditory and gustatory stimuli

Shepherd

Hautus

Stocks

et al. 2011

Atten Percept Psychophys

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The SIAM yes-no task is an efficient bias-free adaptive procedure for estimating absolute thresholds, though it arguably requires further evaluation prior to its adoption into mainstream psychological research. We report two experiments undertaken in the auditory and gustatory modalities designed to assess the accuracy and efficiency of the SIAM method. In the first experiment, estimates of absolute thresholds for 1000-Hz tones obtained using a two-alternative forced choice adaptive procedure were compared to those obtained using both the SIAM yes-no task and a modification of the SIAM task incorporating the method of free response, the SIAM-rapid. In Experiment 2, we compared absolute thresholds for sucrose in solution obtained with either a two-alternative forced choice adaptive procedure or the SIAM yes-no task. Both experiments demonstrated the efficiency and validity of the SIAM approach, with SIAM thresholds proving to be equivalent to those obtained in the two-alternative forced choice tasks and to those reported in the literature.

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Section: Discussionmentioning

confidence: 74%

The single interval adjustment matrix (SIAM) yes–no task: an empirical assessment using auditory and gustatory stimuli

Shepherd

Hautus

Stocks

et al. 2011

Atten Percept Psychophys

View full text Add to dashboard Cite

show abstract

“…For instance, experimental variables that could influence the results include the initial starting value of the stimulus, the step size and the tracking algorithm (Leek, 2001). These variables have not been consistent in the studies exploring auditory perceptual processing in ASD.…”

Section: Discussionmentioning

confidence: 99%

The Relationship Between Auditory Processing and Restricted, Repetitive Behaviors in Adults with Autism Spectrum Disorders

Kargas

López

Reddy

et al. 2014

J Autism Dev Disord

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“…Two staircases were used in each condition, one which presented clockwise transformations of the stimulus and the other presented the anti-clockwise transformations. Each staircase used a one-up three-down method which converged on 79% accuracy (Leek, 2001). The target grating was presented 5 degrees away from the reference grating on the first trial of each staircase.…”

Section: Orientation Discrimination Taskmentioning

confidence: 99%

Superior orientation discrimination and increased peak gamma frequency in autism spectrum conditions.

Dickinson¹,

Bruyns‐Haylett²,

Smith³

et al. 2016

Journal of Abnormal Psychology

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While perception is recognised as being atypical in individuals with autism spectrum conditions (ASC), the underlying mechanisms for such atypicality are unclear. Here we test the hypothesis that individuals with ASC will show enhanced orientation discrimination compared to neurotypical observers. This prediction is based both on anecdotal report of superior discriminatory skills in ASC and also on evidence in the auditory domain that some individuals with ASC have superior pitch discrimination. In order to establish whether atypical perception might be mediated by an imbalance in the ratio of neural excitation and inhibition (E:I ratio) we also measured peak gamma frequency which provides an indication of neural inhibition levels. Using a rigorous thresholding method we found that orientation discrimination thresholds for obliquely oriented stimuli were significantly lower in participants with ASC. Using EEG to measure the visually induced gamma band response we also found that peak gamma frequency was higher in participants with ASC, relative to a well-matched control group. These novel results suggest that neural inhibition may be increased in the occipital cortex of individuals with ASC. Implications for existing theories of an imbalance in the E:I ratio of ASC are discussed.

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Adaptive procedures in psychophysical research

Cited by 691 publications

References 45 publications

The single interval adjustment matrix (SIAM) yes–no task: an empirical assessment using auditory and gustatory stimuli

The single interval adjustment matrix (SIAM) yes–no task: an empirical assessment using auditory and gustatory stimuli

The Relationship Between Auditory Processing and Restricted, Repetitive Behaviors in Adults with Autism Spectrum Disorders

Superior orientation discrimination and increased peak gamma frequency in autism spectrum conditions.

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