Questions: While driving, Juan is slower to detect traffic signals if he is talking on his cell phone. This BEST illustrates the im of: consciousness. selective attention. the cocktail party effect. narcolepsy.

The answer is selective attention.

Consciousness refers to our awareness of ourselves and our environment. While it is a broad concept that encompasses many aspects of mental functioning, it does not specifically address the issue of being slower to detect traffic signals while talking on a cell phone.

Selective attention is the process by which a person focuses on one particular stimulus while ignoring others. In this case, Juan is focusing on his cell phone conversation, which diverts his attention away from detecting traffic signals. This divided attention results in slower reaction times to traffic signals, illustrating the concept of selective attention.

The cocktail party effect refers to the ability to focus on a single conversation in a noisy environment, such as a party, while filtering out other background noise. While this concept is related to selective attention, it specifically deals with auditory attention in a noisy setting, not the scenario described in the question.

Narcolepsy is a sleep disorder characterized by excessive daytime sleepiness and sudden sleep attacks. It is unrelated to the scenario of being slower to detect traffic signals while talking on a cell phone.