A new two-alternative forced choice method for the unbiased characterization of perceptual bias and discriminability

Jogan, Matjaž; Stocker, Alan A.

doi:10.1167/14.3.20

Cited by 60 publications

(50 citation statements)

References 45 publications

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“…Specific experiments to study the timing and nature of this adaptation and the just noticeable differences of stimuli will need to be considered. Due to our time limitations we chose to have subjects self-report discriminability, but future experiments could use established psychometric tests [25], [26], [27], [28] to quantitatively measure discriminability and assess changes over time and how the degree of discriminability affects task performance.…”

Section: Discussionmentioning

confidence: 99%

Task-Specific Somatosensory Feedback via Cortical Stimulation in Humans

Cronin

Collins

et al. 2016

IEEE Trans. Haptics

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Cortical stimulation through electrocorticographic (ECoG) electrodes is a potential method for providing sensory feedback in future prosthetic and rehabilitative applications. Here we evaluate human subjects’ ability to continuously modulate their motor behavior based on feedback from direct surface stimulation of the somatosensory cortex. Subjects wore a dataglove that measured their hand aperture position and received one of three stimuli over the hand sensory cortex based on their current hand position as compared to a target aperture position. Using cortical stimulation feedback, subjects adjusted their hand aperture to move towards the target aperture region. One subject was able to achieve accuracies and R2 values well above chance (best performance: R2 = 0.93; accuracy = 0.76/1). Performance dropped during the catch trial (same stimulus independent of the position) to below chance levels, suggesting that the subject had been using the varied sensory feedback to modulate their motor behavior. To our knowledge, this study represents one of the first demonstrations of using direct cortical surface stimulation of the human sensory cortex to perform a motor task, and is a first step towards developing closed-loop human sensorimotor brain-computer interfaces.

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Section: Discussionmentioning

confidence: 99%

Task-Specific Somatosensory Feedback via Cortical Stimulation in Humans

Cronin

Collins

et al. 2016

IEEE Trans. Haptics

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“…This is applicable to the present study, as, although subjects were tasked with identifying localization shifts, there would be some timbral changes due to the use of ICTD. Such conditions would make, for example, a two alternative forced choice method [17] inadequate, with Bech [18] reporting subject's difficulty in distinguishing between test and reference stimuli that differed in loudness, timbre, and spaciousness when utilizing an adaptive form of this method.…”

Section: Test Methodsmentioning

confidence: 99%

Vertical Stereophonic Localization in the Presence of Interchannel Crosstalk: the Analysis of Frequency-Dependent Localization Thresholds

Wallis¹

2016

J. Audio Eng. Soc.

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Listening tests were conducted in order to investigate the frequency dependency of localization thresholds in relation to vertical interchannel crosstalk. Octave band and broadband pink noise stimuli were presented to subjects as phantom images from vertically arranged stereophonic loudspeakers located directly in front of the listening position. With respect to the listening position the lower loudspeaker was not elevated; the upper loudspeaker was elevated by 30• . Subjects completed a method of adjustment task in which they were required to reduce the amplitude of the upper loudspeaker until the resultant phantom image matched the position of the same stimulus presented from the lower loudspeaker alone. The upper loudspeaker was delayed with respect to the lower by 0, 0.5, 1, 5, and 10 ms. The experimental data demonstrated that the main effect of frequency on the localization threshold was significant, with the low frequency stimuli (125 and 250 Hz) requiring significantly less level reduction (less than 6 dB) than the mid-high (1, 2, and 8 kHz) frequency stimuli (9-10.5 dB reduction). The main effect of interchannel time difference (ICTD) on the localization thresholds for each octave band was found to be non-significant. For all stimuli interchannel level difference (ICLD) was always necessary, indicating that the precedence effect is not a feature of median plane localization.

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“…Notably, we designed our experiment so that the general structure of the tasks (i.e., comparison of two elements) and the adjustment procedure was similar and equivalent for all five illusions (both geometrical and non-geometrical illusions). Therefore a dissociation between geometrical illusions and the non-geometrical illusion was very unlikely to stem from unrelated cognitive factors3940. Interestingly, an approach of comparing and correlating the strength of the illusions across participants was pioneered very long ago8.…”

Section: Discussionmentioning

confidence: 99%

Perceptual similarity and the neural correlates of geometrical illusions in human brain structure

Axelrod

Schwarzkopf

Gilaie-Dotan

et al. 2017

Sci Rep

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Geometrical visual illusions are an intriguing phenomenon, in which subjective perception consistently misjudges the objective, physical properties of the visual stimulus. Prominent theoretical proposals have been advanced attempting to find common mechanisms across illusions. But empirically testing the similarity between illusions has been notoriously difficult because illusions have very different visual appearances. Here we overcome this difficulty by capitalizing on the variability of the illusory magnitude across participants. Fifty-nine healthy volunteers participated in the study that included measurement of individual illusion magnitude and structural MRI scanning. We tested the Muller-Lyer, Ebbinghaus, Ponzo, and vertical-horizontal geometrical illusions as well as a non-geometrical, contrast illusion. We found some degree of similarity in behavioral judgments of all tested geometrical illusions, but not between geometrical illusions and non-geometrical, contrast illusion. The highest similarity was found between Ebbinghaus and Muller-Lyer geometrical illusions. Furthermore, the magnitude of all geometrical illusions, and particularly the Ebbinghaus and Muller-Lyer illusions, correlated with local gray matter density in the parahippocampal cortex, but not in other brain areas. Our findings suggest that visuospatial integration and scene construction processes might partly mediate individual differences in geometric illusory perception. Overall, these findings contribute to a better understanding of the mechanisms behind geometrical illusions.

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A new two-alternative forced choice method for the unbiased characterization of perceptual bias and discriminability

Cited by 60 publications

References 45 publications

Task-Specific Somatosensory Feedback via Cortical Stimulation in Humans

Task-Specific Somatosensory Feedback via Cortical Stimulation in Humans

Vertical Stereophonic Localization in the Presence of Interchannel Crosstalk: the Analysis of Frequency-Dependent Localization Thresholds

Perceptual similarity and the neural correlates of geometrical illusions in human brain structure

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