Publications by Carl Kristoffer Aberg

Perceptual learning, roving and the unsupervised bias

Wulfram Gerstner, Nicolas Frémaux, Michael Herzog, Carl Kristoffer Aberg

Perceptual learning improves perception through training. Perceptual learning improves with most stimulus types but fails when certain stimulus types are mixed during training (roving). This result is surprising because classical supervised and unsupervise ...

Elsevier2012

Trait anxiety and post-learning stress do not affect perceptual learning

Maria del Carmen Sandi Perez, Michael Herzog, Carl Kristoffer Aberg, Aaron Michael Clarke

While it is well established that stress can modulate declarative learning, very few studies have investigated the influence of stress on non-declarative learning. Here, we studied the influence of post-learning stress, which effectively modulates declarat ...

2012

About similar characteristics of visual perceptual learning and LTP

Michael Herzog, Carl Kristoffer Aberg

Perceptual learning is an implicit form of learning which induces long-lasting perceptual enhancements. Perceptual learning shows intriguing characteristics. For example, a minimal number of trials per session is needed for learning and the interleaved pre ...

2012

Different types of feedback change decision criterion and sensitivity differently in perceptual learning

Michael Herzog, Carl Kristoffer Aberg

In (perceptual) learning, performance improves with practice either by changes in sensitivity or decision criterion. Often, changes in sensitivity are regarded as the appropriate measure of learning while changes in criterion are considered unavoidable nui ...

Association for Research in Vision and Ophthalmology2012

Consolidation of simple perceptual tasks cannot (always) be disrupted

Michael Herzog, Carl Kristoffer Aberg

2010

Does perceptual learning suffer from retrograde interference?

Michael Herzog, Carl Kristoffer Aberg

In motor learning, training a task B can disrupt improvements of performance of a previously learned task A, indicating that learning needs consolidation. An influential study suggested that this is the case also for visual perceptual learning [1]. Using t ...

Public Library of Science2010

Disrupting Perceptual Learning

Carl Kristoffer Aberg

Perceptual learning is learning to perceive and is essential for all forms of perception and learning. For a long time it was believed that perceptual learning was a simple process suitable as a model for studying general mechanism of learning. Researchers ...

EPFL2010

Perceptual learning with Chevrons requires a minimal number of trials, transfers to untrained directions, but does not require sleep

Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

In most models of perceptual learning, the amount of improvement of performance does not depend on the regime of stimulus presentations, but only on the sheer number of trials. Here, we kept the number of stimulus presentations constant while varying the n ...

Elsevier2009

Perceptual learning and roving: Stimulus types and overlapping neural populations

Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

In perceptual learning, performance usually improves when observers train with one type of stimulus, for example, a bisection stimulus. Roving denotes the situation when, instead of one, two or more types of stimuli are presented randomly interleaved, for ...

Elsevier2009

Temporal patterning of 'unlearnable' stimuli types does not always enable learning

Michael Herzog, Carl Kristoffer Aberg

Presenting two or more stimulus types randomly interleaved, so-called roving stimuli, disrupts perceptual learning in many paradigms. It was recently reported that learning with disrupting stimuli types is possible when stimuli are presented in an alternat ...

2009

Anesthesia prevents auditory perceptual learning

Alain Farron, Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

BACKGROUND: An auditory perceptual learning paradigm was used to investigate whether implicit memories are formed during general anesthesia. METHODS: Eighty-seven patients who had an American Society of Anesthesiologists physical status of I-III and were s ...

Lippincott, Williams & Wilkins2009

Modeling perceptual learning: why mice do not play backgammon

Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

Perceptual learning is often considered one of the simplest and basic forms of learning in general. Accordingly, it is usually modeled with simple and basic neural networks which show good results in grasping the empirical data. Simple meets simple. Comple ...

2009

When does roving disrupt perceptual learning?

Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

Training with one type of a visual stimulus usually improves performance. When observers train with two or more stimulus types presented in random order (so-called roving), performance improves for certain stimulus types but not for others. To understand w ...

2008

Roving in perceptual learning: stimulus interference and overlapping neural populations

Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

Performance usually improves when observers train with one type of a visual stimulus. Roving denotes the situation when, instead of one, two or more types of stimuli are presented randomly interleaved (one per trial). For some stimulus types, performance i ...

Association for Research in Vision and Ophthalmology2008

Stimulus interference in visual perceptual learning in roving conditions

Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

2008

Hyperacuity learning requires a minimal intensity of training

Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

2008

Perceptual learning requires a minimal number of trials per session, but no sleep

Michael Herzog, Elisa Tartaglia, Carl Kristoffer Aberg

A common assumption in perceptual learning is that the improvement of performance basically depends on the amount of training. However, other factors such as sleep and training intensity (trials per session) have also been shown to be important. We trained ...

Association for Research in Vision and Ophthalmology2008