Week 3: Writing Assignment
Answer one of the following questions based on this week's
material (one-page typewritten response, double-spaced, due Friday
- Summarize behavioral and neurophysiological evidence that
supports the hypothesis that attention modulates sensory
processing by selectively altering effective stimulus contrast.
- The effects on V4 neural response of attending to a target
instead of a distractor outside the receptive field (RF), compared
to attending to a target when both target and distractor are
inside the neuron's RF, are different. Describe this
- What is surround inhibition? Is the suppressive effect
of a surround stimulus strongest or weakest when it is of the
neuron's preferred orientation? How is this similar or
different from the contrast-dependent interactions when both
stimuli appear within the classical receptive field?
- What is the evidence that frontal eye field (FEF) may mediate
attentional effects on V4 tuning curves by effectively
modulating contrast sensitivity?
- Summarize the evidence that feature-based attention, in
addition to space-modulated attention, modulates V4 neural
Extra credit (one paragraph, due Friday 04/23/10, up to 20% bonus).
- Describe two theoretical reasons why the effect of contrast
and attentional modulation should be multiplicative scaling
instead of sharpening of the tuning curve.
Last modified: Mon Apr 19 18:15:31 PDT 2010