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Auditory event-related potentials associated with perceptual reversals of bistable pitch motion.

Davidson GD, Pitts MA - Front Hum Neurosci (2014)

Bottom Line: Previous event-related potential (ERP) experiments have consistently identified two components associated with perceptual transitions of bistable visual stimuli, the "reversal negativity" (RN) and the "late positive complex" (LPC).Pairs of complex tones with ambiguous pitch relationships were presented sequentially while subjects reported whether they perceived the tone pairs as ascending or descending in pitch.These two components may be auditory analogs of the visual RN and LPC, suggesting functionally equivalent but anatomically distinct processes in auditory vs. visual bistable perception.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, Reed College Portland, OR, USA.

ABSTRACT
Previous event-related potential (ERP) experiments have consistently identified two components associated with perceptual transitions of bistable visual stimuli, the "reversal negativity" (RN) and the "late positive complex" (LPC). The RN (~200 ms post-stimulus, bilateral occipital-parietal distribution) is thought to reflect transitions between neural representations that form the moment-to-moment contents of conscious perception, while the LPC (~400 ms, central-parietal) is considered an index of post-perceptual processing related to accessing and reporting one's percept. To explore the generality of these components across sensory modalities, the present experiment utilized a novel bistable auditory stimulus. Pairs of complex tones with ambiguous pitch relationships were presented sequentially while subjects reported whether they perceived the tone pairs as ascending or descending in pitch. ERPs elicited by the tones were compared according to whether perceived pitch motion changed direction or remained the same across successive trials. An auditory reversal negativity (aRN) component was evident at ~170 ms post-stimulus over bilateral fronto-central scalp locations. An auditory LPC component (aLPC) was evident at subsequent latencies (~350 ms, fronto-central distribution). These two components may be auditory analogs of the visual RN and LPC, suggesting functionally equivalent but anatomically distinct processes in auditory vs. visual bistable perception.

No MeSH data available.


Behavioral data showing the number of stable trials preceding a reversal trial as a function of the overall frequency of reversal trials (A), and the cumulative probability of a reversal occurring as a function of trials following a reversal (B). Both figures demonstrate the inevitability of perceptual reversals over time, a key feature of bistable stimuli.
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Figure 3: Behavioral data showing the number of stable trials preceding a reversal trial as a function of the overall frequency of reversal trials (A), and the cumulative probability of a reversal occurring as a function of trials following a reversal (B). Both figures demonstrate the inevitability of perceptual reversals over time, a key feature of bistable stimuli.

Mentions: Perceptual reversals of pitch motion occurred on average every 2.92 trials (4.38 s), and followed a monotonically decreasing distribution (Figure 3), meaning the probability of a stable period continuing decreased steadily on each trial. An exponential decay function fitted to these data points matched closely (r2 = 0.98). The shape of this curve indicates that reversals were inevitable since the probability that a reversal will not occur decreased asymptotically to zero. Reversals were also shown to be unpredictable, meaning that a given reversal could not be predicted by perceptual reports on preceding trials. In particular, the correlation between the lengths of adjacent stable periods (as measured by number of stable perceptions before a reversal) was low (r = 0.147). Mean reaction time, collapsed across both conditions was 838.6 ms post-tone-2-onset (sd = 150.0), and did not differ statistically between ascending and descending percepts (p = 0.945) or between stable and reversal trials (p = 0.701).


Auditory event-related potentials associated with perceptual reversals of bistable pitch motion.

Davidson GD, Pitts MA - Front Hum Neurosci (2014)

Behavioral data showing the number of stable trials preceding a reversal trial as a function of the overall frequency of reversal trials (A), and the cumulative probability of a reversal occurring as a function of trials following a reversal (B). Both figures demonstrate the inevitability of perceptual reversals over time, a key feature of bistable stimuli.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4126364&req=5

Figure 3: Behavioral data showing the number of stable trials preceding a reversal trial as a function of the overall frequency of reversal trials (A), and the cumulative probability of a reversal occurring as a function of trials following a reversal (B). Both figures demonstrate the inevitability of perceptual reversals over time, a key feature of bistable stimuli.
Mentions: Perceptual reversals of pitch motion occurred on average every 2.92 trials (4.38 s), and followed a monotonically decreasing distribution (Figure 3), meaning the probability of a stable period continuing decreased steadily on each trial. An exponential decay function fitted to these data points matched closely (r2 = 0.98). The shape of this curve indicates that reversals were inevitable since the probability that a reversal will not occur decreased asymptotically to zero. Reversals were also shown to be unpredictable, meaning that a given reversal could not be predicted by perceptual reports on preceding trials. In particular, the correlation between the lengths of adjacent stable periods (as measured by number of stable perceptions before a reversal) was low (r = 0.147). Mean reaction time, collapsed across both conditions was 838.6 ms post-tone-2-onset (sd = 150.0), and did not differ statistically between ascending and descending percepts (p = 0.945) or between stable and reversal trials (p = 0.701).

Bottom Line: Previous event-related potential (ERP) experiments have consistently identified two components associated with perceptual transitions of bistable visual stimuli, the "reversal negativity" (RN) and the "late positive complex" (LPC).Pairs of complex tones with ambiguous pitch relationships were presented sequentially while subjects reported whether they perceived the tone pairs as ascending or descending in pitch.These two components may be auditory analogs of the visual RN and LPC, suggesting functionally equivalent but anatomically distinct processes in auditory vs. visual bistable perception.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, Reed College Portland, OR, USA.

ABSTRACT
Previous event-related potential (ERP) experiments have consistently identified two components associated with perceptual transitions of bistable visual stimuli, the "reversal negativity" (RN) and the "late positive complex" (LPC). The RN (~200 ms post-stimulus, bilateral occipital-parietal distribution) is thought to reflect transitions between neural representations that form the moment-to-moment contents of conscious perception, while the LPC (~400 ms, central-parietal) is considered an index of post-perceptual processing related to accessing and reporting one's percept. To explore the generality of these components across sensory modalities, the present experiment utilized a novel bistable auditory stimulus. Pairs of complex tones with ambiguous pitch relationships were presented sequentially while subjects reported whether they perceived the tone pairs as ascending or descending in pitch. ERPs elicited by the tones were compared according to whether perceived pitch motion changed direction or remained the same across successive trials. An auditory reversal negativity (aRN) component was evident at ~170 ms post-stimulus over bilateral fronto-central scalp locations. An auditory LPC component (aLPC) was evident at subsequent latencies (~350 ms, fronto-central distribution). These two components may be auditory analogs of the visual RN and LPC, suggesting functionally equivalent but anatomically distinct processes in auditory vs. visual bistable perception.

No MeSH data available.