Long-lasting modulation of feature integrationby transcranial magnetic stimulation

Scharnowski, Frank; Rüter, Johannes; Jolij, Jacob; Hermens, Frouke; Kammer, Thomas; Herzog, Michael H.

doi:10.1167/9.6.1

Cited by 111 publications

(129 citation statements)

References 59 publications

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“…Hence, information persistence in a buffer stage might explain why Prime 2 remains dominant even when Prime 1 has a head start long enough to provoke a high rate of response errors under conditions of speeded instead of delayed responding. Such a twostage model was recently proposed for decision making (Rüter, Marcille, Sprekeler, Gerstner, & Herzog, 2012;Rüter, Sprekeler, Gerstner, & Herzog, 2013;Scharnowski, Hermens, Kammer, Ogmen, & Herzog, 2007) and is supported by transcranial magnetic stimulation experiments, which show that vernier fusion takes up to 400 ms (Rüter, Kammer, & Herzog, 2010;Scharnowski et al, 2009).…”

Section: Discussionmentioning

confidence: 79%

“…We know that such fusion occurs when the prime sequence is presented without the target because participants cannot report whether the first or second vernier is offset (Scharnowski et al, 2009). …”

Section: Discussionmentioning

confidence: 99%

“…The offset of Prime 2 was adjusted until participants responded with 45% to 55% in accordance with the offset direction of Prime 1. On average, Prime 2 was adjusted to an offset size of 0.5 arcmin, in accordance with previous studies (Herzog et al, 2003;Scharnowski et al, 2009). Participants were not told there were two verniers, and when questioned at the end of the experiment, they reported being unaware of that fact.…”

Section: Methodsmentioning

confidence: 96%

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Two primes priming: Does feature integration occur before response activation?

et al. 2013

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Responses to a target can be sped up or slowed down by a congruent or incongruent prime, respectively. Even though presentations are rapid, the prime and the target are thought to activate motor responses in strict sequence, with prime activation preceding target activation. In feature fusion, the opposite seems to be the case. For example, a vernier offset to the left is immediately followed by a vernier offset to the right at the same location. The two verniers are not perceived as two elements in sequence but as a single, aligned vernier. Here, we ask the question as to how features are integrated: before or after motor activation? We presented two vernier primes with opposite offset directions preceding a single vernier target. No priming effect occurred when the vernier primes were presented at the same location, indicating that verniers integrate before motor activation. There was also no priming effect when the primes were presented simultaneously at different locations, indicating that there is an integration stage different from the perceptual fusion stage. When the second prime is delayed, it determines priming, even for very long delays. To explain these long integration times, we argue that there is a buffer preceding motor activation.

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Section: Discussionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 96%

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Two primes priming: Does feature integration occur before response activation?

et al. 2013

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“…However, processing and extracting relevant information from visual input is a highly complex process that can take up a considerable amount of time. Recent studies have shown that it can take up to almost 400 msec before visual information is available for conscious report (e.g., Scharnowski et al, 2009;Heinen, Jolij, & Lamme, 2005). It is therefore not surprising that reacting to external events does not require awareness of those events.…”

Section: Introductionmentioning

confidence: 99%

Act Quickly, Decide Later: Long-latency Visual Processing Underlies Perceptual Decisions but Not Reflexive Behavior

Jolij¹,

Scholte

Gaal

et al. 2011

Journal of Cognitive Neuroscience

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Abstract■ Humans largely guide their behavior by their visual representation of the world. Recent studies have shown that visual information can trigger behavior within 150 msec, suggesting that visually guided responses to external events, in fact, precede conscious awareness of those events. However, is such a view correct? By using a texture discrimination task, we show that the brain relies on long-latency visual processing in order to guide perceptual decisions. Decreasing stimulus saliency leads to selective changes in long-latency visually evoked potential components reflecting scene segmentation. These latency changes are accompanied by almost equal changes in simple RTs and points of subjective simultaneity. Furthermore, we find a strong correlation between individual RTs and the latencies of scene segmentation related components in the visually evoked potentials, showing that the processes underlying these late brain potentials are critical in triggering a response. However, using the same texture stimuli in an antisaccade task, we found that reflexive, but erroneous, prosaccades, but not antisaccades, can be triggered by earlier visual processes. In other words: The brain can act quickly, but decides late. Differences between our study and earlier findings suggesting that action precedes conscious awareness can be explained by assuming that task demands determine whether a fast and unconscious, or a slower and conscious, representation is used to initiate a visually guided response. ■

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“…Embora ainda em uso por pesquisadores (27)(28)(29)(30)(31), sua fabricação e comercialização está descontinuada, não existindo um substituto no mercado.…”

Section: Gerador De Estímulos Visuais Desenvolvido -Vsimgunclassified

Instrumentação computacional de tempo real integrada para experimentos com o duto óptico da mosca

Almeida¹

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This work describes the research and development of computational instrumentation to be used in experimental neurobiophysics. The developed electronic modules operate in an integrated manner and are used to generate visual stimuli for invertebrates and capture electrophysiological signals generated by biological systems subjected to sensory stimuli. They are able to provide synchronized stimuli and perform data acquisition of neural signals events to be used for control and analysis of vision experiments with invertebrates at the Laboratory of Neurobiophysics Dipteralab Laboratory, at the IFSC. The integration of electronic instrumentation facilitate its use during experiments allowing, through its monitoring capabilities of the neural data acquisition, the realization of experiments with real time stimuli changes through feedback. The possibility to perform pre-analyses of neural responses in behavioral closed loop experiments are also implemented.

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Long-lasting modulation of feature integrationby transcranial magnetic stimulation

Cited by 111 publications

References 59 publications

Two primes priming: Does feature integration occur before response activation?

Two primes priming: Does feature integration occur before response activation?

Act Quickly, Decide Later: Long-latency Visual Processing Underlies Perceptual Decisions but Not Reflexive Behavior

Instrumentação computacional de tempo real integrada para experimentos com o duto óptico da mosca

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