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Dive into the research topics where Ville Ojanen is active.

Publication


Featured researches published by Ville Ojanen.


Human Brain Mapping | 2006

Attention to visual speech gestures enhances hemodynamic activity in the left planum temporale

Johanna Pekkola; Ville Ojanen; Taina Autti; Iiro P. Jääskeläinen; Riikka Möttönen; Mikko Sams

Observing a speakers articulatory gestures can contribute considerably to auditory speech perception. At the level of neural events, seen articulatory gestures can modify auditory cortex responses to speech sounds and modulate auditory cortex activity also in the absence of heard speech. However, possible effects of attention on this modulation have remained unclear. To investigate the effect of attention on visual speech‐induced auditory cortex activity, we scanned 10 healthy volunteers with functional magnetic resonance imaging (fMRI) at 3 T during simultaneous presentation of visual speech gestures and moving geometrical forms, with the instruction to either focus on or ignore the seen articulations. Secondary auditory cortex areas in the bilateral posterior superior temporal gyrus and planum temporale were active both when the articulatory gestures were ignored and when they were attended to. However, attention to visual speech gestures enhanced activity in the left planum temporale compared to the situation when the subjects saw identical stimuli but engaged in a nonspeech motion discrimination task. These findings suggest that attention to visually perceived speech gestures modulates auditory cortex function and that this modulation takes place at a hierarchically relatively early processing level. Hum Brain Mapp, 2005.


Psychophysiology | 2003

Visual awareness of low-contrast stimuli is reflected in event-related brain potentials

Ville Ojanen; Antti Revonsuo; Mikko Sams

Visual awareness was studied in 11 subjects by using coherent and scrambled objects as stimuli. The stimuli were presented near the subjective perceptual threshold. Explicitly recognized stimuli elicited a specific negative ERP deflection peaking at 460 ms. Our reaction time experiment suggests that this visual awareness negativity (VAN) is similar to that found previously at a shorter latency. We propose that VAN might reflect the exact moment of becoming aware of the task-relevant stimulus properties and provide an online marker of the temporal dynamics of visual awareness.


Neuroreport | 2010

Synchrony of audio-visual speech stimuli modulates left superior temporal sulcus

Marja H. Balk; Ville Ojanen; Johanna Pekkola; Taina Autti; Mikko Sams; Iiro P. Jääskeläinen

The superior temporal sulcus has been suggested to play a significant role in the integration of auditory and visual sensory information. Here, we presented vowels and short video clips of the corresponding articulatory gestures to healthy adult humans with two auditory–visual stimulus intervals during sparse sampling 3-T functional magnetic resonance imaging to detect which brain areas are sensitive to synchrony of speech sounds and associated articulatory gestures. The upper bank of the left middle superior temporal sulcus showed stronger activation during naturally asynchronous stimulation than during simultaneous stimulus presentation. It is possible that this reflects sensitivity of the left middle superior temporal sulcus to temporal synchrony of audio–visual speech stimuli.


NeuroImage | 2005

Processing of audiovisual speech in Broca's area.

Ville Ojanen; Riikka Möttönen; Johanna Pekkola; Iiro P. Jääskeläinen; Raimo Joensuu; Taina Autti; Mikko Sams


NeuroImage | 2006

Perception of matching and conflicting audiovisual speech in dyslexic and fluent readers: An fMRI study at 3 T

Johanna Pekkola; Marja Laasonen; Ville Ojanen; Taina Autti; Iiro P. Jääskeläinen; Teija Kujala; Mikko Sams


Neuroscience Letters | 2004

An electrophysiological correlate of human visual awareness

Maria Wilenius-Emet; Antti Revonsuo; Ville Ojanen


Neuroreport | 2004

Adaptation of neuromagnetic N1 responses to phonetic stimuli by visual speech in humans.

Iiro P. Jääskeläinen; Ville Ojanen; Jyrki Ahveninen; T Auranen; Sari Levänen; Riikka Möttönen; I Tarnanen; Mikko Sams


Archive | 2004

Primary auditory cortex activation by visual speech

Johanna Pekkola; Ville Ojanen; Taina Autti; Iiro P. Jääskeläinen; Riikka Möttönen; Antti Tarkiainen; Mikko Sams


Archive | 2005

Neurocognitive mechanisms of audiovisual speech perception

Ville Ojanen


Archive | 2004

Primary auditory activation by visual speech: an fMRI study at 3 Tesla

Johanna Pekkola; Ville Ojanen; Taina Autti; Iiro P.S J skel inen; Antti Tarkiainen; Mikko Sams

Collaboration


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Mikko Sams

Helsinki University of Technology

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Johanna Pekkola

Helsinki University Central Hospital

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Taina Autti

Helsinki University Central Hospital

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Iiro P. Jääskeläinen

Helsinki University of Technology

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Antti Tarkiainen

Helsinki University of Technology

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Jyrki Tuomainen

University College London

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Marja H. Balk

Helsinki University of Technology

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