Questions: Which model of selective attention suggests that, while there are multiple channels for sensory input, only one channel is processed while the other channels of information are filtered out before sensory processing?

The answer is the second one: Broadbent's model.

Explanation for each option:

1. Single channel detection theory: This is not a widely recognized model of selective attention in the context of cognitive psychology. It does not specifically describe the filtering of sensory input channels.

2. Broadbent's model: This is the correct answer. Broadbent's model, also known as the "filter model" or "early selection model," suggests that there are multiple channels for sensory input, but only one channel is processed at a time. The other channels are filtered out before they reach the level of conscious processing. This model emphasizes the idea that attention acts as a bottleneck, allowing only selected information to pass through for further processing.

3. Deutsch and Deutsch's late filter model: This model proposes that all sensory information is processed to a certain level, and the filtering occurs later, at the level of response selection. It suggests that all inputs are processed for meaning before any filtering occurs, which is contrary to the early selection process described in Broadbent's model.

4. Treisman's attenuation model: This model suggests that instead of completely filtering out unattended information, the unattended channels are attenuated or weakened. This means that while one channel is fully processed, other channels are still partially processed, allowing for some unattended information to be recognized if it is particularly salient or relevant.

In summary, Broadbent's model is the one that describes the filtering of sensory input channels before sensory processing, allowing only one channel to be processed at a time.