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Neural dynamics underlying target detection in the human brain.

Arjun K Bansal1, Radhika Madhavan, Yigal Agam

  • 1Department of Ophthalmology, Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115, Department of Neurosurgery, Brigham and Women's Hospital, Boston, Massachusetts 02115, Department of Neurosurgery, Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115, and Center for Brain Science and Swartz Center for Theoretical Neuroscience, Harvard University, Cambridge, Massachusetts 02138.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|February 21, 2014
PubMed
Summary
This summary is machine-generated.

Brain activity for visual target detection is modulated by task goals. This top-down influence, particularly in object recognition areas, impacts later visual processing stages after initial recognition.

Keywords:
attentional modulationcognitive neuroscienceextrastriate cortexhuman neurophysiologytarget detectionvisual recognition

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Visual Perception

Background:

  • Sensory signal interpretation relies on context, goals, and tasks.
  • The brain integrates visual input with goals to guide behavior and target detection.

Purpose of the Study:

  • To investigate how target detection, guided by goals, modulates visual recognition signals.
  • To identify brain regions and neural dynamics involved in goal-directed visual processing.

Main Methods:

  • Recorded intracranial field potential responses using 776 electrodes in 10 human subjects with epilepsy.
  • Analyzed physiological responses to visual stimuli under conditions of target presence versus absence.

Main Results:

  • Observed reliable differences in neural responses based on target presence.
  • Found significant goal-related modulation in the inferior temporal and fusiform gyri.
  • Detected target modulation onset at ~250 ms post-stimulus, influencing later visual processing.
  • Observed increased gamma frequency power during target presence, suggesting top-down modulation.

Conclusions:

  • Task goals interact with sensory input through top-down signals.
  • These signals influence higher visual processing areas after initial recognition.
  • The findings support models of goal-directed visual processing and attention.